[Bug 15166] New: Changing brightness of backlight freezes kernel with radeon kms enabled.

[Bug 15166] New: Changing brightness of backlight freezes kernel with radeon kms enabled.

[bugzilla-daemon]

http://bugzilla.kernel.org/show_bug.cgi?id=15166

           Summary: Changing brightness of backlight freezes kernel with
                    radeon kms enabled.
           Product: Drivers
           Version: 2.5
    Kernel Version: 2.6.32.6
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: high
          Priority: P1
         Component: Video(DRI - non Intel)
        AssignedTo: drivers_video-dri@kernel-bugs.osdl.org
        ReportedBy: ullman.bugs@gmx.de
        Regression: No


Created an attachment (id=24769)
 --> (http://bugzilla.kernel.org/attachment.cgi?id=24769)
Xorg-log from a normal X startup.

Overview:

Changing the brightness of the backlight freezes the kernel, when radeon kms
(radeon.modeset=1) is enabled. Closing the LID for ca. 5 minutes does the same.

There are several ways to reproduce this:

1.

Step 1: Become root and enter the following:
echo 90 | dd of=/proc/acpi/video/*/LCD/brightness
The system should freeze.

2.

Step 1: If you have a laptop, you can close your LID and wait ca. 5 min. When
you open it, you shouldn´t get your screen on.

3.

Step 1: If you have KDE 4 with powerdevil installed, simply type: startx
I guess, the system freezes when powerdevil tries to get control about the
backlight.

Actual Results:

The system freezes.

Expected Results:

Changing the brightness should work. Switching on the monitor should work.

Build Date and Platform:

Build 2010-01-25 on Gentoo Linux 10.0

Additional Builds and Platforms:

Occurs also with Gentoo-kernel 2.6.32-gentoo-r2

Additional Information:

Hardware:

HP Compaq 6735b (FU308EA)
(Radeon HD 3200)

See also:
http://h10010.www1.hp.com/wwpc/uk/en/sm/WF06b/321957-321957-64295-3955547-3955547-3687779-3840808.html

Userspace-drivers were compiled from Gentoo x11-overlay.

The symptoms of the freeze are very similar to those of a kernel panic:

- MAGIC_SYSRQ is not working.
- New USB-devices are not powered.
- Mouse freezes.
- In console the cursor is disappearing.

But:

- Num Lock and Caps Lock LED are not blinking
- Caps Lock LED does not glow.

I could not boot the 2.6.33-rc5-kernel, because amd-ucode was missing. I will
fix it and test this version later.

I´ll attach Xorg-log.

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[Bug 15166] Changing brightness of backlight freezes kernel with radeon kms enabled.

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http://bugzilla.kernel.org/show_bug.cgi?id=15166





--- Comment #1 from Manuel Ullmann <ullman.bugs@gmx.de>  2010-01-28 21:08:14 ---
I forgot to mention, that the screen of course switches on, when the LID is
opened before these 5 minutes. I guess the freeze is caused, because radeon
tries to switch off the video signal.

If you need any debug outputs from specific kernel-drivers, just tell me the
needed kernel options.

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[Bug 15166] Changing brightness of backlight freezes kernel with radeon kms enabled.

[bugzilla-daemon]

http://bugzilla.kernel.org/show_bug.cgi?id=15166





--- Comment #2 from Manuel Ullmann <ullman.bugs@gmx.de>  2010-01-28 21:12:29 ---
Created an attachment (id=24770)
 --> (http://bugzilla.kernel.org/attachment.cgi?id=24770)
Output from dmesg

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[Bug 15166] Changing brightness of backlight freezes kernel with radeon kms enabled.

[bugzilla-daemon]

http://bugzilla.kernel.org/show_bug.cgi?id=15166





--- Comment #3 from Manuel Ullmann <ullman.bugs@gmx.de>  2010-01-28 21:28:27 ---
Created an attachment (id=24771)
 --> (http://bugzilla.kernel.org/attachment.cgi?id=24771)
kernel configration file .config

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[Bug 15166] Changing brightness of backlight freezes kernel with radeon kms enabled.

[bugzilla-daemon]

http://bugzilla.kernel.org/show_bug.cgi?id=15166





--- Comment #4 from Manuel Ullmann <ullman.bugs@gmx.de>  2010-01-28 22:21:38 ---
I tested this with kernel 2.6.33-rc5 now. This kernel-version is still affected
by this bug.

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[Bug 15166] Changing brightness of backlight freezes kernel with radeon kms enabled.

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http://bugzilla.kernel.org/show_bug.cgi?id=15166





--- Comment #5 from Manuel Ullmann <ullman.bugs@gmx.de>  2010-01-30 23:45:54 ---
Created an attachment (id=24810)
 --> (http://bugzilla.kernel.org/attachment.cgi?id=24810)
kernel 2.6.33-rc5 configuration file .config

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[Bug 15166] Changing brightness of backlight freezes kernel with radeon kms enabled.

[bugzilla-daemon]

http://bugzilla.kernel.org/show_bug.cgi?id=15166


Manuel Ullmann <ullman.bugs@gmx.de> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
     Kernel Version|2.6.32.6                    |2.6.33-rc5, 2.6.32.6




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[Bug 15166] Changing brightness of backlight freezes kernel with radeon kms enabled.

[bugzilla-daemon]

http://bugzilla.kernel.org/show_bug.cgi?id=15166


Manuel Ullmann <ullman.bugs@gmx.de> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
     Kernel Version|2.6.33-rc5, 2.6.32.6        |2.6.33-rc5, 2.6.32.7




--- Comment #6 from Manuel Ullmann <ullman.bugs@gmx.de>  2010-01-31 00:18:38 ---
Ah, I forgot the fourth way of reproducing this bug:

If you have Laptop with BIOS-driven brightness-changing (they change the
brightness, when the power cable is unplugged), you can unplug it to get your
system frozen.

This bug affects also kernel-version 2.6.32.7.

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[Bug 15166] Changing brightness of backlight freezes kernel with radeon kms enabled.

[bugzilla-daemon]

http://bugzilla.kernel.org/show_bug.cgi?id=15166


Alexey Diomin <DiominAY@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |DiominAY@gmail.com




--- Comment #7 from Alexey Diomin <DiominAY@gmail.com>  2010-02-01 19:20:55 ---
HP Compaq 6735b (KU214EA)
(Radeon HD 3200)

bug reproduced

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[Bug 15166] Changing brightness of backlight freezes kernel with radeon kms enabled.

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http://bugzilla.kernel.org/show_bug.cgi?id=15166





--- Comment #8 from Alexey Diomin <DiominAY@gmail.com>  2010-02-01 21:20:21 ---
2.6.33-rc6 also with bug

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[Bug 15166] Changing brightness of backlight freezes kernel with radeon kms enabled.

[bugzilla-daemon]

http://bugzilla.kernel.org/show_bug.cgi?id=15166


Manuel Ullmann <ullman.bugs@gmx.de> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
     Kernel Version|2.6.33-rc5, 2.6.32.7        |2.6.33-rc6, 2.6.32.7




--- Comment #9 from Manuel Ullmann <ullman.bugs@gmx.de>  2010-02-03 22:16:02 ---
Thank you for confirming this bug. I reproduced this also with 2.6.33-rc6.

To summarize the bug again:

This bug seems to occur, whenever any software (BIOS, powerdevil, echo using
the /proc filesystem) tries to reach control over the backlight and when radeon
itself tries to switch off the video signal.

It would be interesting, if it affects only RS780M (Radeon HD 3200 mobile
version) or also other Mobility chips of R6xx-7xx or even all Mobility chips.
(The desktop chips usually don´t need to change the backlight brightness.)
Maybe I´ll ask on forums.gentoo.org, if some guys with this hardware could test
this with radeon kms.

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[Bug 15166] Changing brightness of backlight freezes kernel with radeon kms enabled.

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Rafał Miłecki <zajec5@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |zajec5@gmail.com




--- Comment #10 from Rafał Miłecki <zajec5@gmail.com>  2010-02-03 22:22:27 ---
I have Sony VAIO notebook with ATI 34xx GPU and I use KMS since it's first day.

Brightness on my notebook is controlled by GPU (I can hack GPU registers to
change brightness). I have /sys/class/backlight/acpi_video0 created by
acpi/video.c driver. Changing brightness with /sys/class/backlight/acpi_video0,
or with KDE doesn't cause problems.

I get lock up on resuming (bug #15096) but this should not be related.

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[Bug 15166] Changing brightness of backlight freezes kernel with radeon kms enabled.

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Alex Deucher <alexdeucher@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |alexdeucher@gmail.com




--- Comment #11 from Alex Deucher <alexdeucher@gmail.com>  2010-02-03 23:30:07 ---
I have a rs780-based laptop and the backlight works just fine via acpi.

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[Bug 15166] Changing brightness of backlight freezes kernel with radeon kms enabled.

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--- Comment #12 from Alexey Diomin <DiominAY@gmail.com>  2010-02-04 14:16:11 ---
2 Rafał Miłecki

cat /sys/class/backlight/acpi_video0/brightness
0

echo 10 > cat /sys/class/backlight/acpi_video0/brightness
system freeze

with patch http://bugzilla.kernel.org/attachment.cgi?id=24711 from you bug

cat /sys/class/backlight/acpi_video0/brightness
24
correct.

echo 10 > cat /sys/class/backlight/acpi_video0/brightness
system freeze

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[Bug 15166] Changing brightness of backlight freezes kernel with radeon kms enabled.

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--- Comment #13 from Manuel Ullmann <ullman.bugs@gmx.de>  2010-02-05 20:07:19 ---
@Rafał Miłecki:
Your bug should indeed not be related to this one, because, as you wrote in
your report, you switched to init 3 and disabled radeon (and kms, in
consequence) in your kernel configuration for testing purposes.

@Alex Deucher:
And you are using kms? Cause of course brightness-changing works fine, if
appending radeon.modeset=0 to kernel command line. If you are using kms, the
reasons for this bug are shrinking. The question is now: What has this notebook
series, what others don´t have? The first thing, that comes into my mind, is
UEFI with its BIOS. It changes the brightness, when the power cable is
unplugged (but actually there are other BIOSes like that and I´m wondering, why
this bug doesn´t occur without kms or with my old framebuffer driver uvesafb).

What you all could test, is the second way - I mentioned above - to reproduce a
system freeze. Actually this should be another bug, but I didn´t realize that
while writing the bug report.

Close the LID for ca. 5 minutes. Radeon should try to switch off the video
signal then and freeze the system. Switching on and off the monitor is no
problem.

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--- Comment #14 from Alex Deucher <alexdeucher@gmail.com>  2010-02-05 20:35:34 ---
Yes, I'm using KMS. closing the lid or changing the brightness works fine. 
Likely, acpi is interacting badly with the hw.  We probably need to set some
additional scratch reg bits for newer systems.

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[Bug 15166] Changing brightness of backlight freezes kernel with radeon kms enabled.

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http://bugzilla.kernel.org/show_bug.cgi?id=15166





--- Comment #15 from Manuel Ullmann <ullman.bugs@gmx.de>  2010-02-05 21:58:45 ---
I guess you took in account, that waiting the 5 minutes is important. Cause I
wrote in Comment #1 already, that LID closing and opening within this time
amount is not the problem (radeon disables and enables the monitor fine). But I
guess it is as you said a problem of new hardware.

I just reproduced it and found, that the system freeze differs slightly from
that of the brightness-changing. While the sound-mute-LED changes her color as
usual from yellow to blue and back, if pressed after a system freeze through
brightness-changing, it does not, when the freeze is caused by closing LID (and
waiting 5 min.). All other symptoms are the same (sysrq not working,
USB-devices not powered etc.). Triggering the other LEDs seems to work; they
are dimmed and brightened as usual, when pressed (on both freezes). The
Wireless-LED of course does not work, because the (USB-)wireless-chip has to be
initialized before. 

Ah, and I asserted, that Knoppix 6.1 freezes on boot, when I booted it without
acpi=off. But all other linux distributions didn´t have that problem (including
an installed Gentoo and Ubuntu and Live CDs like grml and dsl) so I guess it is
not relevant. (Knoppix 6.1 had kernel version 2.6.28.4)

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--- Comment #16 from Alex Deucher <alexdeucher@gmail.com>  2010-02-05 22:03:00 ---
Does messing with the display switch hotkey also cause problems?

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--- Comment #17 from Manuel Ullmann <ullman.bugs@gmx.de>  2010-02-08 13:32:53 ---
Sorry, that this took so long. I was offline for 2 days.

I guess you mean the Ctrl+Alt+Fn key-combo, because laptops have usually also a
key with the keycode 'SWITCHVIDEOMODE' on a Fn+Fx key-combo.

Well, display switching works fine. Switching from console to X takes ca. 2
seconds. The switchvideomode-key (for me Fn+F4) switches backwards through
consoles from F12 to F1, while there is actually a 13th X interface (this would
be F13) before switching to F12 (/var/log/messages). But maybe it is reserved
for something else. Using Fn+F4 writes also 'p' out to console and X.

Since a comparison with the kernel behaviour of a desktop pc, I know now what
the kernel is trying to do after this time amount of 5 min. in console. It
tries to blank the screen. But with kms enabled, the monitor is instead
switched off and the system freezes. So it´s not necessary to close the lid.
You just have to wait 5 minutes doing nothing. But the LED of the
sound-mute-button is still working then. (in contrast to a system freeze with
lid closed)

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--- Comment #18 from Manuel Ullmann <ullman.bugs@gmx.de>  2010-02-08 21:36:46 ---
Created an attachment (id=24955)
 --> (http://bugzilla.kernel.org/attachment.cgi?id=24955)
relevant lines of dmesg, when the kernel boots up without firmware

I found accidentally the piece of code, which causes the system freeze. I was
searching for a reason for the 20% CPU-load of X and thought this could be
radeon-ucode (I didn´t know at this point, that this is built into all
kernel-releases except for release candidates; well, i guess now that the
experimental drivers alone are the reason). So I removed radeon-ucode from
kernel configuration and rebooted. I was wondering, why the kernel took about 2
minutes to boot, but when it started, brightness control and blanking the
screen worked.

A look into dmesg (see attachement) showed me unfortunately, that the kernel
was missing firmware for radeon and had for this reason deactivated GPU
acceleration. To be specific, the firmware is:

R600_rlc.bin for me in /lib/firmware/radeon/

The kernel waits ca. 1 min. before continuing the boot sequence without it.
2.6.33-rc5 hangs without it, so it "works" only with 2.6.33-rc6 and rc7.
So I think, until the firmware is not updated, kms won´t be usable for me.

Any other suggestions? Do you need some more debug outputs?

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Manuel Ullmann <ullman.bugs@gmx.de> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
  Attachment #24771|0                           |1
        is obsolete|                            |
  Attachment #24810|0                           |1
        is obsolete|                            |




--- Comment #19 from Manuel Ullmann <ullman.bugs@gmx.de>  2010-02-08 21:40:41 ---
Created an attachment (id=24956)
 --> (http://bugzilla.kernel.org/attachment.cgi?id=24956)
kernel configration file .config of 2.6.33-rc7

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[Bug 15166] Changing brightness of backlight freezes kernel with radeon kms enabled.

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Manuel Ullmann <ullman.bugs@gmx.de> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
     Kernel Version|2.6.33-rc6, 2.6.32.7        |2.6.33-rc7, 2.6.32.7




--- Comment #20 from Manuel Ullmann <ullman.bugs@gmx.de>  2010-02-08 21:42:10 ---
As this bug affects also 2.6.33-rc7 (also it´s the firmware), I mark it as
affected.

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--- Comment #21 from Manuel Ullmann <ullman.bugs@gmx.de>  2010-02-08 21:44:29 ---
Created an attachment (id=24957)
 --> (http://bugzilla.kernel.org/attachment.cgi?id=24957)
kernel configuration file of 2.6.32.7

@Comment 20: I meant although

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--- Comment #22 from Manuel Ullmann <ullman.bugs@gmx.de>  2010-02-09 20:58:17 ---
Created an attachment (id=24980)
 --> (http://bugzilla.kernel.org/attachment.cgi?id=24980)
syslog-ng output of an isuue caused by BIOS.

@Alex Deucher:

You mentioned earlier some 'scratch reg bits'. What are they doing? How could
they fix issues specific to certain systems like the Compaq 6735b series?
Your patch at
http://people.freedesktop.org/~agd5f/0001-drm-radeon-kms-add-additional-safe-regs-for-r4xx-rs.patch
seems to be related to those bits, but it is specific to some graphic chips.


I have experienced, that waking up from S3 or S4 can indeed change the
brightness with kms. As mentioned in Comment 12, the brightness uninitialized
until it is changed. /sys/class/backlight/acpi_video?/backlight has the value
0, although the backlight has full brightness, which should be 24. When
hibernate-script reinitializes the backlight, it is switched to its lowest
brightness. So I can choose now between the highest and lowest brightness. But
nevertheless the main issue, that the system freezes after certain amount of
inactivity, remains.

I understand, that the firmware is not likely to be updated and that instead
the kernel framework around it maybe has to be fixed. Of course this could be
also BIOS-related, as I had already an issue, which was caused by an error in
BIOS with this notebook (see attachement). But as this Bug is not
OS-independent, I doubt that it would be fixed ever.

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--- Comment #23 from Manuel Ullmann <ullman.bugs@gmx.de>  2010-02-10 11:28:03 ---
Created an attachment (id=24987)
 --> (http://bugzilla.kernel.org/attachment.cgi?id=24987)
kernel 2.6.32.8 configuration file

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Manuel Ullmann <ullman.bugs@gmx.de> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
     Kernel Version|2.6.33-rc7, 2.6.32.7        |2.6.33-rc7, 2.6.32.8




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--- Comment #24 from Manuel Ullmann <ullman.bugs@gmx.de>  2010-02-19 14:46:53 ---
Created an attachment (id=25115)
 --> (http://bugzilla.kernel.org/attachment.cgi?id=25115)
kernel 2.6.33-rc8 configuration file

Bug persists in 2.6.33-rc8. However there is a new kms-driver. But according to
help, support for R6xx-7xx is not finished yet. Additionally it´s based on a
new driver stack, which is not specified. I´ve found the branch 'kms-support'
in xf86-video-ati, but don´t know, if it was for initially kms-support in
2.6.32 or it is new. Do you know which branches are needed for the new driver
stack?

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Manuel Ullmann <ullman.bugs@gmx.de> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
  Attachment #24956|0                           |1
        is obsolete|                            |
  Attachment #24957|0                           |1
        is obsolete|                            |
  Attachment #24956|0                           |1
        is obsolete|                            |
  Attachment #24957|0                           |1
        is obsolete|                            |




--- Comment #25 from Manuel Ullmann <ullman.bugs@gmx.de>  2010-02-19 14:56:08 ---
Created an attachment (id=25116)
 --> (http://bugzilla.kernel.org/attachment.cgi?id=25116)
Dmesg output with drm in debug mode (grepped drm)

I´ve tested the kernel option drm.debug=15, but it does not give any hints on
the cause of this problem. Is there any way to see the kernel-output on screen,
although screen freezes? Syslog-ng saves no output, but it is of course not
able to, because the kernel freezes. I´m quite sure, that the kernel should
give some output, although I can not see that.

--- Comment #26 from Manuel Ullmann <ullman.bugs@gmx.de>  2010-02-19 14:56:16 ---
Created an attachment (id=25117)
 --> (http://bugzilla.kernel.org/attachment.cgi?id=25117)
Dmesg output with drm in debug mode (grepped drm)

I´ve tested the kernel option drm.debug=15, but it does not give any hints on
the cause of this problem. Is there any way to see the kernel-output on screen,
although screen freezes? Syslog-ng saves no output, but it is of course not
able to, because the kernel freezes. I´m quite sure, that the kernel should
give some output, although I can not see that.

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Manuel Ullmann <ullman.bugs@gmx.de> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
  Attachment #24956|0                           |1
        is obsolete|                            |
  Attachment #24957|0                           |1
        is obsolete|                            |
  Attachment #24956|0                           |1
        is obsolete|                            |
  Attachment #24957|0                           |1
        is obsolete|                            |




--- Comment #25 from Manuel Ullmann <ullman.bugs@gmx.de>  2010-02-19 14:56:08 ---
Created an attachment (id=25116)
 --> (http://bugzilla.kernel.org/attachment.cgi?id=25116)
Dmesg output with drm in debug mode (grepped drm)

I´ve tested the kernel option drm.debug=15, but it does not give any hints on
the cause of this problem. Is there any way to see the kernel-output on screen,
although screen freezes? Syslog-ng saves no output, but it is of course not
able to, because the kernel freezes. I´m quite sure, that the kernel should
give some output, although I can not see that.

--- Comment #26 from Manuel Ullmann <ullman.bugs@gmx.de>  2010-02-19 14:56:16 ---
Created an attachment (id=25117)
 --> (http://bugzilla.kernel.org/attachment.cgi?id=25117)
Dmesg output with drm in debug mode (grepped drm)

I´ve tested the kernel option drm.debug=15, but it does not give any hints on
the cause of this problem. Is there any way to see the kernel-output on screen,
although screen freezes? Syslog-ng saves no output, but it is of course not
able to, because the kernel freezes. I´m quite sure, that the kernel should
give some output, although I can not see that.

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--- Comment #27 from Alex Deucher <alexdeucher@gmail.com>  2010-02-19 16:27:17 ---
(In reply to comment #24)
> Bug persists in 2.6.33-rc8. However there is a new kms-driver. But according to
> help, support for R6xx-7xx is not finished yet. Additionally it´s based on a
> new driver stack, which is not specified. I´ve found the branch 'kms-support'
> in xf86-video-ati, but don´t know, if it was for initially kms-support in
> 2.6.32 or it is new. Do you know which branches are needed for the new driver
> stack?

R6xx-R7xx is finished, the help is outdated.  As to the driver stack, you need
xf86-video-ati from git master, and mesa from git master or 7.7 branch both
built against libdrm from git master or 2.4.18.

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Manuel Ullmann <ullman.bugs@gmx.de> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
     Kernel Version|2.6.33-rc7, 2.6.32.8        |2.6.33-rc8, 2.6.32.8




--- Comment #28 from Manuel Ullmann <ullman.bugs@gmx.de>  2010-02-19 22:15:11 ---
Tried this with both the master and 7.7 mesa branch. Bug was not fixed. Would
it be possible to see any output from kernel, if I would be on a remote ssh
session?

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Manuel Ullmann <ullman.bugs@gmx.de> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
     Kernel Version|2.6.33-rc8, 2.6.32.8        |2.6.32.6 - 2.6.33




--- Comment #29 from Manuel Ullmann <ullman.bugs@gmx.de>  2010-02-25 18:06:36 ---
Bug still in 2.6.33. As expected. I´ll attach the config.

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Manuel Ullmann <ullman.bugs@gmx.de> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
  Attachment #24987|0                           |1
        is obsolete|                            |
  Attachment #25115|0                           |1
        is obsolete|                            |
  Attachment #25116|0                           |1
        is obsolete|                            |




--- Comment #30 from Manuel Ullmann <ullman.bugs@gmx.de>  2010-02-25 18:09:23 ---
Created an attachment (id=25223)
 --> (http://bugzilla.kernel.org/attachment.cgi?id=25223)
.config file of kernel 2.6.33

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--- Comment #31 from Alexey Diomin <DiominAY@gmail.com>  2010-04-14 12:20:25 ---
2.6.34-rc3 with latest patches from drm-next aslo freeze

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--- Comment #32 from Alex Deucher <alexdeucher@gmail.com>  2010-04-14 14:14:24 ---
Does setting:
Option "NoAccel" "True"
in the device section of your xorg.conf avoid the problem?  Make sure you are
using xf86-video-ati 6.12.191 or newer.

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--- Comment #33 from Alex Deucher <alexdeucher@gmail.com>  2010-04-14 14:18:15 ---
One more thing, does disabling kms avoid the problem as well?  E.g., disable
KMS and make sure ums + acceleration is working.

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--- Comment #34 from Alex Deucher <alexdeucher@gmail.com>  2010-04-14 19:45:51 ---
Created an attachment (id=26004)
 --> (https://bugzilla.kernel.org/attachment.cgi?id=26004)
possible fix

Possible fix version 1.  Please try these patches individually and let me know
if either of them fixes the problem.

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--- Comment #35 from Alex Deucher <alexdeucher@gmail.com>  2010-04-14 19:47:01 ---
Created an attachment (id=26005)
 --> (https://bugzilla.kernel.org/attachment.cgi?id=26005)
alternate fix

Alternate fix.  Please try these patches individually and let me know if either
of them fixes the problem.

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--- Comment #36 from Alexey Diomin <DiominAY@gmail.com>  2010-04-15 15:04:51 ---
fixs not helped

mesa & xf86-video-ati from git, but all tests in runlevel 3 (without starting
X)

when run F13-Beta-i686-Live-KDE.iso (del rhgb) freeze after start kms
http://ivctrans.by/temp/PIC-0032.jpg

on f12 (tested half of the year earlier) has message as on f13 beta now

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Aurélien Couderc <zecoucou@free.fr> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |zecoucou@free.fr




--- Comment #36 from Alexey Diomin <DiominAY@gmail.com>  2010-04-15 15:04:51 ---
fixs not helped

mesa & xf86-video-ati from git, but all tests in runlevel 3 (without starting
X)

when run F13-Beta-i686-Live-KDE.iso (del rhgb) freeze after start kms
http://ivctrans.by/temp/PIC-0032.jpg

on f12 (tested half of the year earlier) has message as on f13 beta now

--- Comment #37 from Aurélien Couderc <zecoucou@free.fr>  2010-04-26 17:38:07 ---
Lenovo X100e also affected.
(Radeon HD 3200)

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--- Comment #38 from Aurélien Couderc <zecoucou@free.fr>  2010-04-27 16:51:41 ---
To answer Alex Deucher's questions:
#32 NoAccel doen't solve the problem (driver 6.13.0)
#33 disabling KMS solves the problem and ums+acceleration works fine

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--- Comment #39 from Alex Deucher <alexdeucher@gmail.com>  2010-04-27 17:35:11 ---
Created an attachment (id=26161)
 --> (https://bugzilla.kernel.org/attachment.cgi?id=26161)
add accel parameter

This patch adds an accel parameter that allows you to disable acceleration in
the drm.  boot with radeon.accel=0 and see if you still get the hang.

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--- Comment #40 from Alex Deucher <alexdeucher@gmail.com>  2010-04-28 03:38:58 ---
I managed to get remote access to an affected machine today, and to start off
with I tried Linus' git tree, bc113f151a73cb2195c2fb40d7d70acf8e2f9208, to be
exact.  And, low and behold, the backlight worked fine. Switched back to an
older kernel and it hung.  So it appears to be fixed, at least as of that
commit.  Can anyone else confirm and if so, help bisect to see what fixed it?

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[Bug 15166] Changing brightness of backlight freezes kernel with radeon kms enabled.

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--- Comment #41 from Alexey Diomin <DiominAY@gmail.com>  2010-04-28 16:43:41 ---
2.6.34-rc5-git8 bug affected

with your patch and boot with radeon.accel=0 all working without freeze

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--- Comment #42 from Alexey Diomin <DiominAY@gmail.com>  2010-04-29 08:48:57 ---
updated Linus' and your git tree

apply 2 patch on 2.6.34-rc5-git8

1. diff origin...dave_drm/drm-linus 
2. diff origin...dave_drm/drm-radeon-next

kms work fine

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--- Comment #43 from Alex Deucher <alexdeucher@gmail.com>  2010-04-29 15:56:47 ---
(In reply to comment #42)
> updated Linus' and your git tree
> 
> apply 2 patch on 2.6.34-rc5-git8
> 

Which patches are you referring to?

> 1. diff origin...dave_drm/drm-linus 
> 2. diff origin...dave_drm/drm-radeon-next
> 
> kms work fine

Does an updated tree without the patches also work?

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--- Comment #43 from Alex Deucher <alexdeucher@gmail.com>  2010-04-29 15:56:47 ---
(In reply to comment #42)
> updated Linus' and your git tree
> 
> apply 2 patch on 2.6.34-rc5-git8
> 

Which patches are you referring to?

> 1. diff origin...dave_drm/drm-linus 
> 2. diff origin...dave_drm/drm-radeon-next
> 
> kms work fine

Does an updated tree without the patches also work?

--- Comment #44 from Manuel Ullmann <ullman.bugs@gmx.de>  2010-04-30 23:44:09 ---
Created an attachment (id=26191)
 --> (https://bugzilla.kernel.org/attachment.cgi?id=26191)
output from patch -p1 for all three patches

I tested kernel-2.6.34-rc6 from git. The kernel itself has not fixed the hang.

The patches probably do not apply, because the patched files have changed too
much. I attached the output of 'patch'. However it would be great, if you could
adjust them.

The "add accel parameter patch" applies mostly correct, so the radeon.accel=0
works and in consequence the brightness changing (as Alexey said).

But so far I could not get kms completely to work.

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--- Comment #45 from Alexey Diomin <DiominAY@gmail.com>  2010-05-03 08:35:05 ---
For testing I switch to drm-radeon-testing branch

commit 6b8b1786a8c29ce6e32298b93ac8d4a18a2b11c4 resolved bug.

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--- Comment #46 from Manuel Ullmann <ullman.bugs@gmx.de>  2010-05-03 21:58:30 ---
Confirmed. Fixed in drm-radeon-testing branch. No patch needed.

Aurélien Couderc, could you confirm this on your notebook?

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--- Comment #47 from Aurélien Couderc <zecoucou@free.fr>  2010-05-04 22:59:41 ---
Yes, it's fixed in drm-radeon-testing for my laptop too.

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--- Comment #48 from Alex Deucher <alexdeucher@gmail.com>  2010-05-05 15:00:30 ---
One of my coworkers who is also experiencing the problem bisected it down to:
f3eee54276dfd1117fd94259f2b4a38388264724:

commit f3eee54276dfd1117fd94259f2b4a38388264724
Author: Yinghai Lu <yinghai@kernel.org>
Date:   Mon Dec 14 11:52:15 2009 +0900

   x86: Gart: fix breakage due to IOMMU initialization cleanup

   This fixes the following breakage of the commit
   75f1cdf1dda92cae037ec848ae63690d91913eac:

   - GART systems that don't AGP with broken BIOS and more than 4GB
     memory are forced to use swiotlb. They can allocate aperture by
     hand and use GART.

   - GART systems without GAP must disable GART on shutdown.

   - swiotlb usage is forced by the boot option,
     gart_iommu_hole_init() is not called, so we disable GART
     early_gart_iommu_check().

   Signed-off-by: Yinghai Lu <yinghai@kernel.org>
   Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
   LKML-Reference:
   <1260759135-6450-3-git-send-email-fujita.tomonori@lab.ntt.co.jp>
   Signed-off-by: Ingo Molnar <mingo@elte.hu>

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--- Comment #49 from Manuel Ullmann <ullman.bugs@gmx.de>  2010-05-12 11:27:42 ---
If it has been confirmed, that the kernel is bug affected immediately before
this commit, then it´s fine for me. But it seems, that it can be caused by the
broken BIOS alone. The Radeon chip is not linked via AGP, but PCI express and I
don´t have more than 4GB memory (actually 2). Well, I guess we can close the
Bug now. Does anyone disagree? Btw, will this fix be merged into master until
the 2.6.34 release?

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Manuel Ullmann <ullman.bugs@gmx.de> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |CODE_FIX




--- Comment #50 from Manuel Ullmann <ullman.bugs@gmx.de>  2010-05-14 20:57:16 ---
Well, I´ll close the bug now. Would be nice, if anyone could answer my
question, though.

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--- Comment #51 from Alex Deucher <alexdeucher@gmail.com>  2010-05-15 12:02:06 ---
No one has yet tracked down what fixed it.  That is just the commit that
apparently broke it, at least for one user.

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Manuel Ullmann <ullman.bugs@gmx.de> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |REOPENED
         Resolution|CODE_FIX                    |




--- Comment #52 from Manuel Ullmann <ullman.bugs@gmx.de>  2010-05-15 12:35:50 ---
Ah, sorry. I misunderstood you. (my english is quite bad)

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--- Comment #53 from Alexey Diomin <DiominAY@gmail.com>  2010-05-15 15:24:17 ---
Revert f3eee54276dfd1117fd94259f2b4a38388264724 on current 2.5.34-rc7 also not
resolved bug

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Jérôme Glisse <glisse@freedesktop.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |glisse@freedesktop.org




--- Comment #54 from Jérôme Glisse <glisse@freedesktop.org>  2010-05-16 10:47:38 ---
Alexey what do you mean ? The bug is still present on 2.6.34-rc7 ? and
reverting 
f3eee54276dfd1117fd94259f2b4a38388264724 doesn't solve the issue ?

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--- Comment #55 from Alexey Diomin <DiominAY@gmail.com>  2010-05-19 08:33:13 ---
2 Jérôme Glisse 

On current moment bug fix only in drm-next brunch, on 2.6.34-rc7 kms freeze.

As say Alex: bug started with commit f3eee54276dfd1117fd94259f2b4a38388264724.
For testing I revert f3eee54276dfd1117fd94259f2b4a38388264724 on 2.6.34-rc7,
but bug remain.

P.S. it's all work for me and maybe for Manuel (laptop equals)

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--- Comment #56 from Manuel Ullmann <ullman.bugs@gmx.de>  2010-05-24 00:14:19 ---
The fix is in both branches; drm-next and drm-radeon-testing. It is:

commit 7547a917fa5f3b2406f52c7dcf7ec9ad3c8532eb
Merge: a8089e8 6b8b178
Author: Dave Airlie <airlied@redhat.com>
Date:   Tue Apr 20 14:15:09 2010 +1000

    Merge branch 'drm-ttm-unmappable' into drm-core-next

    * drm-ttm-unmappable:
      drm/radeon/kms: enable use of unmappable VRAM V2
      drm/ttm: remove io_ field from TTM V6
      drm/vmwgfx: add support for new TTM fault callback V5
      drm/nouveau/kms: add support for new TTM fault callback V5
      drm/radeon/kms: add support for new fault callback V7
      drm/ttm: ttm_fault callback to allow driver to handle bo placement V6
      drm/ttm: split no_wait argument in 2 GPU or reserve wait

    Conflicts:
        drivers/gpu/drm/nouveau/nouveau_bo.c

Steps to confirm:

1. Create new drm-2.6 repository

2. Checkout one of the mentioned branches

3. Reset to this commit

4. Compile, install kernel and reboot

5. Test backlight changing.
-> Result: Bug fixed

6. cd to git repository. Reset to one commit before (git reset --hard HEAD^).

7. Compile, install kernel and reboot

8. Test backlight changing.
-> Result: kms freeze

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Manuel Ullmann <ullman.bugs@gmx.de> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
     Kernel Version|2.6.32.6 - 2.6.33           |2.6.32.6 - 2.6.34




--- Comment #57 from Manuel Ullmann <ullman.bugs@gmx.de>  2010-05-28 19:52:31 ---
Marking 2.6.34 as affected. Fixed however in drm-next and drm-radeon-testing
since 2.6.34-rc5 by the mentioned fix. Any chances, that this will be merged
into 2.6.35 master?

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--- Comment #58 from Alex Deucher <alexdeucher@gmail.com>  2010-05-28 20:31:43 ---
Already merged into 2.6.35.

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Manuel Ullmann <ullman.bugs@gmx.de> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|REOPENED                    |RESOLVED
         Resolution|                            |CODE_FIX




--- Comment #59 from Manuel Ullmann <ullman.bugs@gmx.de>  2010-05-29 23:47:03 ---
Thank you. It´s indeed fixed in latest git. No need to leave the bug open, I
think.

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