[Bug 35183] New: system freezes with 2.6.38-rc kernel and kms pageflip enabled

[Bug 35183] New: system freezes with 2.6.38-rc kernel and kms pageflip enabled

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=35183

           Summary: system freezes with 2.6.38-rc kernel and kms pageflip
                    enabled
           Product: DRI
           Version: unspecified
          Platform: Other
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Radeon
        AssignedTo: dri-devel@lists.freedesktop.org
        ReportedBy: aaalmosss@gmail.com


The system freezes completely after a few 3d operations (like changing the
desktop in compiz a couple of times). No error message appears in dmesg or
syslog. Tried both rc7 and rc8 and the drm-radeon-testing branch. If I disable
kms pageflip in xorg.conf, the system seems stable. I also tried setting
radeon.agpmode=-1, but didn't help.

Hardware: radeon 9600xt (rv350 agp)
software: latest debian unstable (libdrm2 2.4.23, xserver-xorg 7.6,
xserver-xorg-video-radeon 6.14.0)

Considering that most distributions use compositing wm by default, and kms
pageflip is also enabled by default, this seems like a serious problem.

Bugs 21472, 34137, 34643 might be related, but I'm not sure.

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[Bug 35183] system freezes with 2.6.38-rc kernel and kms pageflip enabled

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=35183

--- Comment #1 from Dave Airlie <airlied@freedesktop.org> 2011-03-11 03:10:42 PST ---
I've debugged this and I'm hoping I have a fix, hopefully I can get a cleaned
up patch in 5mins - tomorrow. (this is mainly to stop anyone else getting into
this)

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[Bug 35183] system freezes with 2.6.38-rc kernel and kms pageflip enabled

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=35183

--- Comment #2 from Dave Airlie <airlied@freedesktop.org> 2011-03-11 03:14:56 PST ---
Created an attachment (id=44345)
 View: https://bugs.freedesktop.org/attachment.cgi?id=44345
 Review: https://bugs.freedesktop.org/review?bug=35183&attachment=44345

initial minimal patch to fix hangs.

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[Bug 35183] system freezes with 2.6.38-rc kernel and kms pageflip enabled

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=35183

--- Comment #3 from Álmos <aaalmosss@gmail.com> 2011-03-12 14:07:12 PST ---
2.6.38-rc8 with the patch seems stable so far.
Doesn't it disable pageflip, though? According to phoronix there should be some
3d performance increase with pageflip, but I haven't noticed any.

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[Bug 35183] system freezes with 2.6.38-rc kernel and kms pageflip enabled

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=35183

--- Comment #4 from Dave Airlie <airlied@freedesktop.org> 2011-03-12 16:04:54 PST ---
 no it just moves things around to avoid hitting those registers at runtime.

The speed increase you'll see is with fullscreen apps running at less than
vblank frames. You should see more fps or get closer to vblank.

However currently page flip is limited to vblank synced rendering.

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[Bug 35183] system freezes with 2.6.38-rc kernel and kms pageflip enabled

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=35183

Marek Olšák <maraeo@gmail.com> changed:

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

--- Comment #5 from Marek Olšák <maraeo@gmail.com> 2011-03-15 08:55:00 PDT ---
I think the fix is part of kernel 2.6.38. Closing then.

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