[Bug 38792] Radeon HD 5750: GPU lockup CP stall while browsing in Firefox

[bugzilla-daemon@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=38792


Jean Delvare <khali@linux-fr.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |NEEDINFO




--- Comment #10 from Jean Delvare <khali@linux-fr.org>  2012-07-01 12:56:39 ---
Bisection pointed to:

commit 416a2bd274566a6f607a271f524b2dc0b84d9106
Author: Alex Deucher <alexander.deucher@amd.com>
Date:   Thu May 31 19:00:25 2012 -0400

    drm/radeon: fixup tiling group size and backendmap on r6xx-r9xx (v4)

    Tiling group size is always 256bits on r6xx/r7xx/r8xx/9xx. Also fix and
    simplify render backend map. This now properly sets up the backend map
    on r6xx-9xx which should improve 3D performance.

    Vadim benchmarked also:
    Some benchmarks on juniper (5750), fullscreen 1920x1080,
    first result - kernel 3.4.0+ (fb21affa), second - with these patches:

    Lightsmark:   91 fps => 123 fps    +35%
    Doom3:        74 fps => 101 fps    +36%

    Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
    Signed-off-by: Jerome Glisse <jglisse@redhat.com>
    Signed-off-by: Dave Airlie <airlied@redhat.com>

Reverting this single commit on top of kernel 3.5-rc5 fixes the problem for me.
Jure, Jonathon and everyone else hitting this issue, please try reverting 
416a2bd274566a6f607a271f524b2dc0b84d9106 and report whether it helped or not.
At least this will tell us if my problem is really the same as yours.

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