[Bug 16376] random - possibly Radeon DRM KMS related - freezes

[bugzilla-daemon@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=16376





--- Comment #25 from Martin Steigerwald <Martin@Lichtvoll.de>  2010-08-14 17:03:47 ---
Dave, I hope you do not mind adding you to the CC list, but since this happens
on a ThinkPad T42 your feedback might help.

I thought

----------------------------------------
From: Michel Dänzer <daenzer@vmware.com>

commit e376573f7267390f4e1bdc552564b6fb913bce76 upstream.

This fixes a problem where on low VRAM cards we'd run out of space for
validation.

[airlied: Tested on my M7, Thinkpad T42, compiz works with no problems.]

Signed-off-by: Michel Dänzer <daenzer@vmware.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
----------------------------------------

might have fixed this bug since I read something about this having been tested
on a T42. I did not recognize that it was your comment, so I contacted Michel
Dänzer about it.

He said its unlikely that it will fix my issue, but I should try it anyway.
Well as said above, I tried 2.6.35.2 and it still hung.

You say compiz works without problems for you. I read this as you do not get
any hard freezes with any kernel since 2.6.34 on your ThinkPad T42. Did you try
KDE 4 KWin compositing as well? What X.org / driver versions do you use. There
must be a difference why it works for your ThinkPad, but not for mine.

Here are my current versions:

martin@shambhala:~> apt-show-versions | egrep
"(xserver-xorg/|xserver-xorg-core/|xserver-xorg-video-radeon/|libgl1-mesa-dri/|libdrm2/|libdrm-radeon1/|kde-window-manager/|kdelibs5/)"
kde-window-manager/squeeze uptodate 4:4.4.5-1
kdelibs5/squeeze uptodate 4:4.4.5-1
libdrm-radeon1/experimental uptodate 2.4.21-1
libdrm2/experimental uptodate 2.4.21-1
libgl1-mesa-dri/experimental uptodate 7.8.2-2
xserver-xorg/squeeze uptodate 1:7.5+6
xserver-xorg-core/squeeze uptodate 2:1.7.7-3
xserver-xorg-video-radeon/squeeze uptodate 1:6.13.1-2

As noted above in the bug report: Kernel 2.6.33 works rock stable for me with
Radeon KMS. But that said, I am not even sure whether its a Radeon KMS issue.
That it only happens after a KDE 4 compositing session has started points at
it, but is no proof anyway.

I want to help to provide information to get this fixes, but I feel uneasy
about doing a full bisect between 2.6.33 and 2.6.34. I might start trying out
whether it starts happening at some rc, starting with rc3 and going forwards or
backwards from there.

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