The fix you observed in kernel 2.6.39-rc5 is probably due to this
commit. The photo attached to the bug linked in the commit is very
similar to your photo.
commit 5785e53ffa73f77fb19e378c899027afc07272bc
Author: Alex Deucher
Date: Tue Apr 19 15:24:59 2011 -0400
drm/radeon/kms: pll tweaks for r7xx
Prefer min m to max p only on pre-r7xx asics.
Fixes:
https://bugs.freedesktop.org/show_bug.cgi?id=36197
Signed-off-by: Alex Deucher
Cc: [email protected]
Signed-off-by: Dave Airlie
** Bug watch added: freedesktop.org Bugzilla #36197
http://bugs.freedesktop.org/show_bug.cgi?id=36197
** Changed in: linux (Ubuntu)
Status: Confirmed => Fix Committed
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https://bugs.launchpad.net/bugs/763527
Title:
[natty] regression with radeon module (ATI Mobility HD 4570) causes
minor display artefacts
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