[Bug 27186] New: Visual corruption with new r6xx/r7xx accel code

[bugzilla-daemon at freedesktop.org]

http://bugs.freedesktop.org/show_bug.cgi?id=27186

           Summary: Visual corruption with new r6xx/r7xx accel code
           Product: xorg
           Version: 7.5
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/Radeon
        AssignedTo: xorg-driver-ati at lists.x.org
        ReportedBy: dm at mirabel-sil.com
         QAContact: xorg-team at lists.x.org


Created an attachment (id=34221)
 --> (http://bugs.freedesktop.org/attachment.cgi?id=34221)
Taskbar corrupted

Starting with commit :
http://cgit.freedesktop.org/xorg/driver/xf86-video-ati/commit/?id=488c9fd8300505cc6c0c2f8f0f00849f27cc5d63

I am experiencing some visual corruption, mostly in KDE taskbar and on rare
occasions on other KDE desktop plasmoids.
At some point, items/icons are randomly disappearing and re-appearing again
when hovering the mouse on them.
It often starts to occur when switching desktop (I run Kwin with GL
compositing).

Each time a "corruption" occurs, I get the following msg in Xorg.log :
reloc emit failure -22 (set_render_target 262)
reloc emit failure -22 (set_render_target 279)
reloc emit failure -22 (set_render_target 283)
Needless to say it is filled with such msgs after some time in the X session.

I first suspected a bug in Mesa, but it wasn't. Reverting previous to the above
commit solves the problem.

My setup :
Xorg 1.7.6
Mesa libdrm xf86-video-ati from git
2.6.33 or next + glisse/drm


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