[Bug 15186] Radeon KMS: [RV730] Garbled kwin shadows and pixmaps

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http://bugzilla.kernel.org/show_bug.cgi?id=15186





--- Comment #15 from Robert Schedel <r.schedel@yahoo.de>  2010-02-03 21:14:07 ---
After the last comment I made another doublecheck on vanilla 2.6.32, and in
fact Nils is right: Vanilla 2.6.32 also is broken -- I had it in longer use,
but either I was wrong in my observation, it was my newer 100% x11perf test
scenario, or it was some other masking SW dependency at that time. The effect
also looks more like flickering, less permanent at that version.

After further retests this means for kernel versions:
- 2.6.32 (and some older ones): FAILED.
- 2.6.33-rc3: OK.
- 2.6.33-rc4..rc6: FAILED.

Now I made another inverse bisect session today, looking for the first "good"
fix before abovementioned bad commit. Finally found this one:
>commit 23956dfa82eab95931aab5fa9886c1e96c41e4dc
>Author: Dave Airlie <airlied@redhat.com>
>Date:   Mon Nov 23 12:01:09 2009 +1000
>
>    drm/radeon/kms: add HDP flushing for all GPUs.

Sounds reasonable.

I am unsure whether you want to keep the regression flag of this ticket.
Actually, the point releases always used to be "broken" -- only intermediate
rc's were fixed and re-broken :)

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