From mboxrd@z Thu Jan 1 00:00:00 1970
From: bugzilla-daemon@bugzilla.kernel.org
Subject: [Bug 24462] New: r600: spread spectrum: flickering screen (bisected)
Date: Wed, 8 Dec 2010 16:18:41 GMT
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https://bugzilla.kernel.org/show_bug.cgi?id=24462
Summary: r600: spread spectrum: flickering screen (bisected)
Product: Drivers
Version: 2.5
Kernel Version: 2.6.37-rc5
Platform: All
OS/Version: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: Video(DRI - non Intel)
AssignedTo: drivers_video-dri@kernel-bugs.osdl.org
ReportedBy: kronos.it@gmail.com
Regression: Yes
2.6.37-rc5 exhibits a slight screen (notebook panel) flickering, mostly
noticeable around text (e.g. white-on-black in xterm) with occasional
horizontal lines; using 2.6.36 as known "good" kernel I've bisected the issue
down to this commit:
ba032a58d1f320039e7850fb6e8651695c1aa571 is the first bad commit
commit ba032a58d1f320039e7850fb6e8651695c1aa571
Author: Alex Deucher
Date: Mon Oct 4 17:13:01 2010 -0400
drm/radeon/kms: rework spread spectrum handling
This patch reworks spread spectrum handling to enable it
properly on lvds and DP/eDP links. It also fixes several
bugs in the old spread spectrum code.
- Use the ss recommended reference divider if available
when calculating the pll
- Use the proper ss command tables on pre-DCE3 asics
- Avoid reading past the end of the ss info tables
- Enable ss on evergreen asics (lvds, dp, tmds)
- Enable ss on DP/eDP links
Signed-off-by: Alex Deucher
Signed-off-by: Dave Airlie
:040000 040000 2017e6abb9a12586686bcddb61479f2b158c9d7c
7e6117db061ef286ab6822455c65cf5492de7eaa M drivers
Hardware is a M76:
01:00.0 VGA compatible controller: ATI Technologies Inc M76 [Radeon Mobility HD
2600 Series]
dmesg is attached.
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