[Bug 45641] Screen goes black randomly

[Bug 45641] Screen goes black randomly

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https://bugs.freedesktop.org/show_bug.cgi?id=45641

Alex Deucher <agd5f@yahoo.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         AssignedTo|xorg-driver-ati@lists.x.org |dri-devel@lists.freedesktop
                   |                            |.org
          QAContact|xorg-team@lists.x.org       |
            Product|xorg                        |DRI
            Version|git                         |unspecified
          Component|Driver/Radeon               |DRM/Radeon

--- Comment #5 from Alex Deucher <agd5f@yahoo.com> 2012-02-07 10:13:49 PST ---
Does the blanking happen are regular intervals (e.g., every 30 seconds, every 2
minutes, etc.)?  If it worked with 3.0, can you bisect the kernel to see what
commit is causing the problem?

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[Bug 45641] Screen goes black randomly

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https://bugs.freedesktop.org/show_bug.cgi?id=45641

--- Comment #6 from John <john.ettedgui@gmail.com> 2012-02-07 12:22:13 PST ---
It seems quite random to me.
Also I remember it happening around the 3.0 release, but I cannot say that the
issue is coming from there.
For all I know it could be KDE messing up somewhere or something like that,
since it does not happen with XMBC fullscreen.

Because of that, and the fact that the problem is quite random, I don't know if
it  is best to bitsect the kernel already.

Do you know of any (debug) log I can find that could point me at the culprit a
bit?

Thanks!

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[Bug 45641] Screen goes black randomly

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https://bugs.freedesktop.org/show_bug.cgi?id=45641

--- Comment #7 from Warren Jones <wjones@fluke.com> 2012-06-15 16:36:50 PDT ---
I'm experiencing similar problems.  My screen will go black for 1-2 seconds at
random intervals, typically more than a dozen times per hour.  In a two monitor
configuration, sometimes the left monitor will go black, sometimes the right
monitor, and occasionally both.

My video card:  ATI RV610 [Radeon HD 2400 XT]

My configuration:

    openSUSE 12.2 beta 1
    kernel-desktop-3.4.0-2.2
    xorg-x11-7.6_1-1.1
    xf86-video-ati-6.14.4-2.1

The problem appeared somewhere between openSUSE 12.2 milestone 3 and beta 1. 
This is the last known good configuration:

    openSUSE 12.2 milestone 3
    kernel-default-3.3.0-2.1
    xorg-x11-7.6-76.3
    xorg-x11-driver-video-7.6-91.1

(The radeon driver moved from xorg-x11-driver-video to xf86-video-ati between
these two releases.)

eg> cat /etc/X11/xorg.conf.d/50-device.conf
Section "Device"
  Identifier   "Default Device"
  VendorName   "ATI"
  BoardName    "Radeon HD 2400 XT"
  Driver       "radeon"
  Option       "monitor-DVI-0" "Monitor[1]"
  Option       "monitor-DVI-1" "Monitor[0]"
EndSection

I installed kernel-default-3.3.0-2.1 from the last known good configuration to
rule out problems related to KMS, but the black screens continued.

I've observed the problem with KDE, Gnome, XFCE, LXDE, etc.

I don't see anything suspicious in /var/log/Xorg.0.log, /var/log/messages or
the output from dmesg.

I've also filed a bug report here:

    https://bugzilla.novell.com/show_bug.cgi?id=767360

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--- Comment #8 from Jan Papež (honyczek) <honyczek@centrum.cz> ---
The issue still remains.

openSUSE 12.3
kernel-desktop  3.7.10-1.1.1
xorg-x11-server 7.6_1.13.2-1.2.1
xf86-video-ati  7.0.0-2.1.1
libdrm2         2.4.42-1.1.1
libdrm_radeon1  2.4.42-1.1.1
Mesa            9.0.2-34.3.1

I have ATI Radeon HD 2400 XT (RV610).

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[Bug 45641] Screen goes black randomly

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--- Comment #9 from Alex Deucher <agd5f@yahoo.com> ---
Does booting with radeon.disp_priority=2 on the kernel command line in grub
help?  For systems where this is a regression, can you bisect?

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--- Comment #10 from Jan Papež (honyczek) <honyczek@centrum.cz> ---
> Does booting with radeon.disp_priority=2 on the kernel command line in grub help?

No.

> For systems where this is a regression, can you bisect?

I don't understand. Could you explain this question please (if it was to me)?

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--- Comment #11 from Alex Deucher <agd5f@yahoo.com> ---
(In reply to comment #10)
> > For systems where this is a regression, can you bisect?
> 
> I don't understand. Could you explain this question please (if it was to me)?

If it worked with an older kernel, you can use git to bisect between working
kernel and the the broken one.  Bisecting allows you to pinpoint the change
that caused the problem.  There are a number of good tutorials on using git to
bisect a problem.

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https://bugs.freedesktop.org/show_bug.cgi?id=45641

--- Comment #12 from Jan Papež (honyczek) <honyczek@centrum.cz> ---
Additional specific info:
I'm using extended desktop on two DVI connected monitors (the card has one
connector and you have to use Y cable to connect something). Even if I switch
to cloned desktop, it blinks too.

Interesting: If I connect only one monitor (either on cable 1 or 2), it works
well.

Both monitors have resolution 1680x1050.

My ideal monitor position would be desktop assembled from 1050x1680 (rotated
left) and 1680x1050.

With fglrx it was good working...

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--- Comment #13 from Alex Deucher <agd5f@yahoo.com> ---
(In reply to comment #12)
> Interesting: If I connect only one monitor (either on cable 1 or 2), it
> works well.

The blinking is caused by data underflow to the display controllers.  All
clients on the GPU (displays, 3D engine, etc.) contend for memory bandwidth. 
If you have a card with limited memory bandwidth (like yours), you may get
underflow if there is not enough bandwidth to service the displays at a
particular moment in time.  Running several large monitors increases the memory
bandwidth requirements.  The display watermarks may need some fine tuning for
situations like yours.  Additional things to try:
1. try a lower refresh rate
2. Disable acceleration (Option "NoAccel" "True" in the device section of your
xorg.conf)
3. Disable Tiling (Option "ColorTiling" "False" in the device section of your
xorg.conf)
4. Try mesa 9.1 or newer.

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--- Comment #14 from Jan Papež (honyczek) <honyczek@centrum.cz> ---
(In reply to comment #13)

> 2. Disable acceleration (Option "NoAccel" "True" in the device section of your xorg.conf)
> 3. Disable Tiling (Option "ColorTiling" "False" in the device section of your xorg.conf)

Is possible to add these options when using KMS? Modifying
/etc/X11/xorg.conf.d/*.conf is enough?

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--- Comment #15 from Alex Deucher <agd5f@yahoo.com> ---
(In reply to comment #14)
> Is possible to add these options when using KMS? Modifying
> /etc/X11/xorg.conf.d/*.conf is enough?

yes.

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--- Comment #16 from Jan Papež (honyczek) <honyczek@centrum.cz> ---
(Additional info to comment #12)
> Interesting: If I connect only one monitor (either on cable 1 or 2), it works well.
It is not working well, but in only blinks in longer intervals. After resuming
from hibernation, it started blinking more.
(In reply to comment #13)
> 2. Disable acceleration (Option "NoAccel" "True" in the device section of your xorg.conf)

After starting Xorg with NoAccel option, it is not blinking. But:
1. why don't use acceleration on accelerated graphic card?
2. I can't use rotated monitor, because it requires acceleration enabled.

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--- Comment #17 from Alex Deucher <agd5f@yahoo.com> ---
Created attachment 76907
  --> https://bugs.freedesktop.org/attachment.cgi?id=76907&action=edit
possible fix

Does the attached kernel patch help?

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--- Comment #18 from John <john.ettedgui@gmail.com> ---
I tried the patch today but got another black screen already.
I have an 4670 by the way, not sure if the patch was made for that one or
not...

Thanks

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--- Comment #19 from John <john.ettedgui@gmail.com> ---
Still same behavior with current drivers/kernel/mesa, I was hoping something
would have helped :)

Alex, do you have any other patch I can test against this?

Thanks,
John

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John <john.ettedgui@gmail.com> changed:

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

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John <john.ettedgui@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |CLOSED

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