[Nouveau] [Bug 16978] New: "tile offscreen pixmaps" causing graphics corruption on NV50?

[bugzilla-daemon at freedesktop.org]

http://bugs.freedesktop.org/show_bug.cgi?id=16978

           Summary: "tile offscreen pixmaps" causing graphics corruption on
                    NV50?
           Product: xorg
           Version: unspecified
          Platform: Other
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/nouveau
        AssignedTo: nouveau at lists.freedesktop.org
        ReportedBy: chris at chris-lamb.co.uk
         QAContact: xorg-team at lists.x.org
                CC: skeggsb at gmail.com


Hi,

(Shamelessly Cc'ing Ben Skeggs as he authored the offending commits)

Am seeing some graphics corruption on nouveau with my 8600 GT consisting of odd
black or white speckles on some widgets.

It's especially noticable on the folder list of the Claws Mail mail client, but
also appears as white horizontal lines in a gnome-terminal window after some
time. Please ask if a photo would be useful.

I've bisected it as follows:

 * Working version:
   - drm
       401f77a2ef1d55feaccc13cdae1e5379f4cfec7e
       i915: official name for GM45 chipset
       Zhenyu Wang <zhenyu.z.wang at intel.com>
   - nouveau
       5c1deac8384413dc483238f60c366e98253c11d6
       exa: pass window coords to m2mf-based UTS/DFS
       Ben Skeggs <skeggsb at gmail.com>

 * Broken version:
   - drm
       c7ed2c67916ee8058301c53b9d4690d81728fb95
       nouveau: interface changes for nv5x 3d
       Ben Skeggs <skeggsb at gmail.com>
   - nouveau
       33fad279e935a5a134ee5cc1777b8ed7510101d0
       nv50: tile offscreen pixmaps
       Ben Skeggs <skeggsb at gmail.com>

I don't know whether it is nouveau or drm commit that is causing the issue -
the "bad" nouveau commit requires a newer drm than its working neighbour (bumps
NOUVEAU_DRM_HEADER_PATCHLEVEL). I would guess it was the "tile offscreen
pixmaps" commit though.

Am running Linux 2.6.25/2.6.26 on x86_64.

Regards,


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