[Bug 12900] New: [intel 855GM] problems with tiled output in various circumstances

[<bug...@bu...>]

http://bugzilla.kernel.org/show_bug.cgi?id=12900

           Summary: [intel 855GM] problems with tiled output in various
                    circumstances
           Product: Drivers
           Version: 2.5
     KernelVersion: 2.6.29-rc8
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI)
        AssignedTo: dri...@ke...
        ReportedBy: da...@ff...
                CC: jb...@vi...


Latest working kernel version: 2.6.29-rc3
Distribution: debian unstable
Hardware Environment: IBM X40 Latop

Problem Description:

In short: When using kms, glxgears is strangely tiled. When _not_ using kms,
all the output (save the X cursor) of the 2d ddx is strangely tiled (if the ddx
is new enough to support tiling). For the details, see my original bug report
on the 2d intel ddx at

https://bugs.freedesktop.org/show_bug.cgi?id=20289

After some testing it looks like the kernel is the culprit. For tracking down
the exact commit with bisecting my userspace env was:

xf86-video-intel: xf86-video-intel-2.4.97.0-369-gd9dbdb3 (using git describe)
xorg: 1.6 rc from debian experimental
libdrm: libdrm-2.4.5-41-g82eac80

According to my bisect-run, the breakage was introduced in the following
commit:

commit 0f973f27888e4664b253ab2cf69c67c2eb80ab1b
Author: Jesse Barnes <jb...@vi...>
Date:   Mon Jan 26 17:10:45 2009 -0800

    drm/i915: add fence register management to execbuf

I've tried to revert this on top of 2.6.29-rc8, but this failed due to merge
conflicts.


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