[Bug 15186] New: Radeon KMS: [RV730] Garbled kwin shadows and pixmaps

[Bug 15186] New: Radeon KMS: [RV730] Garbled kwin shadows and pixmaps

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http://bugzilla.kernel.org/show_bug.cgi?id=15186

           Summary: Radeon KMS: [RV730] Garbled kwin shadows and pixmaps
           Product: Drivers
           Version: 2.5
    Kernel Version: 2.6.33-rc4
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - non Intel)
        AssignedTo: drivers_video-dri@kernel-bugs.osdl.org
        ReportedBy: r.schedel@yahoo.de
        Regression: Yes


Created an attachment (id=24816)
 --> (http://bugzilla.kernel.org/attachment.cgi?id=24816)
Xserver log

Since 2.6.33-rc4 up to rc6 I randomly have garbled kwin shadows, either blue or
yellow frames around the window shadows.
In kernels 2.6.32 and <=2.6.33-rc3 this was not observable (=regression).

Also described here by someone else:
http://bbs.archlinux.org/viewtopic.php?pid=690047#p690047

The effect happens randomly when switching between windows. However, it is also
100% reproducable for me by the command
  x11perf -create
After this the window has a white shadow frame (see screenshot). The window
entry in the taskbar is sometimes garbled with a white pixmap too (see
screenshot).

If running with kwin composite *disabled*, only the white pixmap is observed --
as window shadow effects are disabled.

Kernel log or xserver log do not provide any useful hints.

Bisecting the git kernel shows this as culprit:
> [c07d7237a639d57dc91ea7efdbc1b3f85c7a095d] Merge branch 'drm-linus' of
> git://git.kernel.org/pub/scm/linux/kernel/git/airlied/drm-2.6
> c07d7237a639d57dc91ea7efdbc1b3f85c7a095d is the first bad commit

Bisecting branch "drm-linus" further showed this culprit:
> cafe6609d6dc0a6a278f9fdbb59ce4d761a35ddd is the first bad commit
> commit cafe6609d6dc0a6a278f9fdbb59ce4d761a35ddd
> Author: Jerome Glisse <jglisse@redhat.com>
> Date:   Thu Jan 7 12:39:21 2010 +0100
>
> drm/radeon/kms: Schedule host path read cache flush through the ring V2

After reverting this patch on 2.6.33-rc6, the issue was resolved on my hardware
configuration. However, I am unsure about the internals of this commit.

Information hopefully is sufficient for an expert to track this further.

Environment:
Linux 2.6.33-rc4..6 with Radeon KMS ("modprobe radeon modeset=1")
Mesa master branch
xf86-video-ati master branch
Xorg server 1.7.4
libdrm 2.4.17 (or master too)
KDE 4.3.95 (composite desktop enabled or disabled, see above)

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[Bug 15186] Radeon KMS: [RV730] Garbled kwin shadows and pixmaps

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--- Comment #1 from r.schedel@yahoo.de  2010-01-31 11:58:23 ---
Created an attachment (id=24817)
 --> (http://bugzilla.kernel.org/attachment.cgi?id=24817)
Screenshot of konsole window executing "x11perf -create"

Konsole window reproducably has garbled white frame after executing x11perf
-create (probably due to large number of window blits).

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[Bug 15186] Radeon KMS: [RV730] Garbled kwin shadows and pixmaps

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--- Comment #2 from r.schedel@yahoo.de  2010-01-31 11:59:14 ---
Created an attachment (id=24818)
 --> (http://bugzilla.kernel.org/attachment.cgi?id=24818)
Screenshot of taskbar part with garbled window entry

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--- Comment #3 from r.schedel@yahoo.de  2010-01-31 12:13:49 ---
Created an attachment (id=24821)
 --> (http://bugzilla.kernel.org/attachment.cgi?id=24821)
Kernel config

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--- Comment #4 from Jérôme Glisse <glisse@freedesktop.org>  2010-02-01 11:50:18 ---
Created an attachment (id=24851)
 --> (http://bugzilla.kernel.org/attachment.cgi?id=24851)
Flush HDP before IB

Please try if this patch fix the issue (don't revert the other HDP commit, just
apply this patch on top of lastest 2.6.33-rc).

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--- Comment #5 from r.schedel@yahoo.de  2010-02-01 18:49:32 ---
Applied patch on top of vanilla 2.6.33-rc6:
Unfortunately not fixed, no visible impact.

"x11perf -create" still triggered white window frames. Also changing focus
between X11 windows still triggered spurious blue/yellow shadow frames around
the windows.

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[Bug 15186] Radeon KMS: [RV730] Garbled kwin shadows and pixmaps

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Rafael J. Wysocki <rjw@sisk.pl> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |rjw@sisk.pl
             Blocks|                            |14885




--- Comment #6 from Rafael J. Wysocki <rjw@sisk.pl>  2010-02-01 21:14:52 ---
First-Bad-Commit : cafe6609d6dc0a6a278f9fdbb59ce4d761a35ddd
Handled-By : Jerome Glisse <jglisse@redhat.com>

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[Bug 15186] Radeon KMS: [RV730] Garbled kwin shadows and pixmaps

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--- Comment #7 from Jérôme Glisse <glisse@freedesktop.org>  2010-02-02 12:58:46 ---
Created an attachment (id=24870)
 --> (http://bugzilla.kernel.org/attachment.cgi?id=24870)
Force hdp flush on set_domain(CPU) & wait_idle

Please apply this patch on top of clean 2.6.33rc* and check that it fix the
issue. This patch is like reverting the commit you did point out thus it should
definitly solve the issue but it's an hack. Once you checked that it evectively
fix the issue change the set_domain #if 1 to #if 0 and retest, then rechange to
if 1 and change the if 1 of wait_idle to if 0 and retest, report result. Thanks

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--- Comment #8 from Robert Schedel <r.schedel@yahoo.de>  2010-02-02 18:54:24 ---
Applied second patch on top of vanilla 2.6.33-rc6:
- Both #if 1's: *Fixed*
- set_domain #if 0, wait_idle #if 1: *Fixed*
- set_domain #if 1, wait_idle #if 0: *Not fixed* (same effect as before)

The wait_idle part seems important.

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[Bug 15186] Radeon KMS: [RV730] Garbled kwin shadows and pixmaps

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Shawn Starr <shawn.starr@rogers.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |shawn.starr@rogers.com




--- Comment #9 from Shawn Starr <shawn.starr@rogers.com>  2010-02-02 21:43:52 ---
I have 2.6.33-rc6 from today's linux-2.6 snapshot from Linus's tree
I tried glisse's latest kms hack patch but I still have text glyph
corruption so it doesn't seem to fix it for me. 

I have a radeon HD 3650 mobile (RV635) FireGL.

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--- Comment #10 from Robert Schedel <r.schedel@yahoo.de>  2010-02-02 22:27:58 ---
I never observed text glyph corruption.

@Shawn Starr: Are you sure you observed the same effect? Did you e.g. bisect it
to the same commit? Or did you observe the same window corruptions as described
by me, and at least those are resolved now or still unresolved for you?

I guess we should avoid that we mix up all possible (current/future)
corruptions into the same ticket.

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--- Comment #11 from Shawn Starr <shawn.starr@rogers.com>  2010-02-02 23:05:09 ---
Corruption is still unresolved see:
http://www.sh0n.net/spstarr/radeon/glyph-corruption.jpg

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--- Comment #12 from Michel Dänzer <michel@daenzer.net>  2010-02-03 09:21:34 ---
Shawn, please stop spamming this report with your unrelated issue.

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Nils Kneuper <crazy-ivanovic@gmx.net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |crazy-ivanovic@gmx.net




--- Comment #13 from Nils Kneuper <crazy-ivanovic@gmx.net>  2010-02-03 12:11:11 ---
I do observe the same issues as the original poster. Though for me the issues
does exist whenever I use KMS. It makes not difference if 2.6.32* (the first
time I tried KMS with my rv670 based card) or 2.6.33-rc6. It makes no
difference if I change acceleration method from OpenGL to XRender.
I have not checked the patch provided in this thread, will do so later on and
check if the issues persist. In general I do guess that it is not a bug in mesa
since without KMS, this issue does not occur. I will get myself rc6, test with
your patch and report back.

System info:
lspci | grep VGA
01:00.0 VGA compatible controller: ATI Technologies Inc RV670PRO [Radeon HD
3850]

Gentoo "unstable" amd64
Linux 2.6.32 up to (at least) 2.6.33-rc5 with Radeon KMS (grub boot param:
radeon.modeset=1)
Mesa git version, master branch
xf86-video-ati git version, master branch
xorg-server-1.7.4.901 (happened with other xorg-server 1.7.x versions, too)
libdrm git version, master branch
KDE 4.3.5 (composite desktop enabled or disabled), same with previous 4.3.x
versions

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--- Comment #14 from Nils Kneuper <crazy-ivanovic@gmx.net>  2010-02-03 13:18:43 ---
(In reply to comment #8)
> Applied second patch on top of vanilla 2.6.33-rc6:
> - Both #if 1's: *Fixed*
> - set_domain #if 0, wait_idle #if 1: *Fixed*
> - set_domain #if 1, wait_idle #if 0: *Not fixed* (same effect as before)
> 
> The wait_idle part seems important.

Okay, after my tests with 2.6.33-rc6 I do have exactly the same results! So the
"wait_idle #if 1" part of the patch basically does the trick. Just to be 100%
sure I checked if the issues do occur with vanilla 2.6.32, too, and they are
there just as with an unpatched 2.6.33-rc6 for me. So it might in fact be that
the "real" issue (at least for me) is something else but the change strangely
does fix things.

As a note on the side: it makes no difference if qt 4.5.x or 4.6.x is used, had
the issues with both.

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--- Comment #15 from Robert Schedel <r.schedel@yahoo.de>  2010-02-03 21:14:07 ---
After the last comment I made another doublecheck on vanilla 2.6.32, and in
fact Nils is right: Vanilla 2.6.32 also is broken -- I had it in longer use,
but either I was wrong in my observation, it was my newer 100% x11perf test
scenario, or it was some other masking SW dependency at that time. The effect
also looks more like flickering, less permanent at that version.

After further retests this means for kernel versions:
- 2.6.32 (and some older ones): FAILED.
- 2.6.33-rc3: OK.
- 2.6.33-rc4..rc6: FAILED.

Now I made another inverse bisect session today, looking for the first "good"
fix before abovementioned bad commit. Finally found this one:
>commit 23956dfa82eab95931aab5fa9886c1e96c41e4dc
>Author: Dave Airlie <airlied@redhat.com>
>Date:   Mon Nov 23 12:01:09 2009 +1000
>
>    drm/radeon/kms: add HDP flushing for all GPUs.

Sounds reasonable.

I am unsure whether you want to keep the regression flag of this ticket.
Actually, the point releases always used to be "broken" -- only intermediate
rc's were fixed and re-broken :)

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Michał Witkowski <neuro@o2.pl> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |neuro@o2.pl




--- Comment #16 from Michał Witkowski <neuro@o2.pl>  2010-02-04 11:26:43 ---
I can confirm Robert's problem. I've got a Lenovo U330 with Ati 3450. Running
either kernel 2.6.32 or 2.6.33rc4-rc6 cause DRI2 (KMS enabled) to show these
yellow/white stripes on Kwin shadows. Reverting to DRI (UMS), fixes the
problem.
I also can reproduce the problem with 100% confidence using gtkperf on either
2.6.32 or 2.6.33rc4-rc6.

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--- Comment #17 from Jérôme Glisse <glisse@freedesktop.org>  2010-02-04 16:15:44 ---
Created an attachment (id=24909)
 --> (http://bugzilla.kernel.org/attachment.cgi?id=24909)
Proper fix

Can you check that this patch also fix the issue. It's a proper fix, if it does
i will ask Dave to put it in the next radeon drm fixes pull.

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--- Comment #18 from Robert Schedel <r.schedel@yahoo.de>  2010-02-04 18:03:46 ---
Applied last patch to vanilla 2.6.33-rc6: In fact fixed.
Will report back if I should find any adverse effects on the long run.
Thanks, Jérôme.

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--- Comment #19 from Michał Witkowski <neuro@o2.pl>  2010-02-04 18:38:38 ---
Great, this patch fixed the problem for me too (applied to clean 2.6.33-rc6) :)

Thanks, Jérôme

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--- Comment #20 from Nils Kneuper <crazy-ivanovic@gmx.net>  2010-02-04 19:00:09 ---
Yes, the "proper fix" seems to work nicely over here, too. Will report if any
issues arise again. Thanks for fixing this, Jérôme.

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[Bug 15186] Radeon KMS: [RV730] Garbled kwin shadows and pixmaps

[bugzilla-daemon]

http://bugzilla.kernel.org/show_bug.cgi?id=15186


Robert Schedel <r.schedel@yahoo.de> changed:

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




--- Comment #21 from Robert Schedel <r.schedel@yahoo.de>  2010-02-07 10:58:54 ---
Applied in 2.6.33-rc7 mainline, regression resolved.

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[Bug 15186] Radeon KMS: [RV730] Garbled kwin shadows and pixmaps

[bugzilla-daemon]

http://bugzilla.kernel.org/show_bug.cgi?id=15186


Rafael J. Wysocki <rjw@sisk.pl> changed:

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




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