[Bug 24802] New: Graphics errors with Radeon KMS driver on RV770

[Bug 24802] New: Graphics errors with Radeon KMS driver on RV770

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=24802

           Summary: Graphics errors with Radeon KMS driver on RV770
           Product: Drivers
           Version: 2.5
    Kernel Version: 2.6.36.2
          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_herrma@informatik.uni-kl.de
        Regression: Yes


After upgrading from 2.6.36.1 to 2.6.36.2 there are some graphics errors (looks
texture related) in OpenGL applications (e.g. OpenArena, foobillard).
It is working normally (without those errors) when switching back to 2.6.36.1.

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[Bug 24802] Graphics errors with Radeon KMS driver on RV770

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=24802


Alex Deucher <alexdeucher@gmail.com> changed:

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




--- Comment #1 from Alex Deucher <alexdeucher@gmail.com>  2010-12-13 01:03:12 ---
Can you bisect what commit is problematic?

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[Bug 24802] Graphics errors with Radeon KMS driver on RV770

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=24802


Reiner Herrmann <r_herrma@informatik.uni-kl.de> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |r_herrma@informatik.uni-kl.
                   |                            |de




--- Comment #2 from Reiner Herrmann <r_herrma@informatik.uni-kl.de>  2010-12-13 14:23:34 ---
I just bisected it and found the problematic commit:

3645e7665f285b51fbb5aa73a255b858abe72cfc is the first bad commit
commit 3645e7665f285b51fbb5aa73a255b858abe72cfc
Author: Alex Deucher <alexdeucher@gmail.com>
Date:   Mon Oct 18 23:54:56 2010 -0400

    drm/radeon/kms: properly compute group_size on 6xx/7xx

    commit 881fe6c1d06bf49f4ab7aef212cdaf66bd059614 upstream.

    Needed for tiled surfaces.

    Signed-off-by: Alex Deucher <alexdeucher@gmail.com>
    Signed-off-by: Dave Airlie <airlied@redhat.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

:040000 040000 996abb61f4c4ccd436f84f159fd50237fb542ed1
b31fe649b2eaff0ed1b7abf05898a75dbbb81dfa M      drivers


When reversing this commit in 2.6.36.2, everything is running normally again.

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[Bug 24802] Graphics errors with Radeon KMS driver on RV770

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=24802





--- Comment #3 from Alex Deucher <alexdeucher@gmail.com>  2010-12-13 15:37:41 ---
This is actually a bug in mesa.  It's fixed by this commit:
http://cgit.freedesktop.org/mesa/mesa/commit/?id=5b15b5f4a8fffa07d8051e6cd4cd0a6c9288fc9f

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[Bug 24802] Graphics errors with Radeon KMS driver on RV770

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=24802





--- Comment #4 from Alex Deucher <alexdeucher@gmail.com>  2010-12-13 15:48:01 ---
Unfortunately, there's no way to support both old and new mesa at the same time
properly because the group size calculation happens when the GPU is initialized
prior to any userspace libs loading.  You can't reconfigure the memory
controller per client and setting the group size wrong means you won't be able
to use new features like 2D tiling.

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[Bug 24802] Graphics errors with Radeon KMS driver on RV770

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=24802


Robert Hooker <sarvatt@gmail.com> changed:

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




--- Comment #5 from Robert Hooker <sarvatt@gmail.com>  2011-01-20 20:45:59 ---
This has been applied to 2.6.35 longterm, is it appropriate there given that it
breaks userspace? Ubuntu started getting a large amount of bug reports about
things being broken after updating to 2.6.35.10.

https://bugs.launchpad.net/ubuntu/+source/linux/+bug/703553

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[Bug 24802] Graphics errors with Radeon KMS driver on RV770

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=24802


Jérôme Glisse <glisse@freedesktop.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
                 CC|                            |glisse@freedesktop.org
         Resolution|                            |CODE_FIX




--- Comment #6 from Jérôme Glisse <glisse@freedesktop.org>  2011-03-07 18:43:54 ---
Solution is to update mesa, see comment #4 for why it can't be fixed properly
otherwise, closing this bug

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