Created attachment 55810 [details] dmesg output When the LVDS panel is turned on after being off the screen flickers as if the backlight is quickly alternating between low and high brightness values. The flickering gradually fades until it is no longer noticeable. The graphics card is: ATI Technologies Inc Whistler [AMD Radeon HD 6600M Series] [1002:6741] Other than LVDS this machine has a Thunderbolt/MiniDP connector. demsg output and vbios are attached.
Created attachment 55811 [details] vbios
Do these patches help? http://people.freedesktop.org/~agd5f/dce_fixes/ They are against drm-next or Linus' tree.
(In reply to comment #2) > Do these patches help? > http://people.freedesktop.org/~agd5f/dce_fixes/ > They are against drm-next or Linus' tree. Yes, those patches eliminate the flicker.
A patch referencing this bug report has been merged in Linux v3.3-rc2: commit 3a47824d85eeca122895646f027dc63480994199 Author: Alex Deucher <alexander.deucher@amd.com> Date: Fri Jan 20 15:01:30 2012 -0500 drm/radeon/kms: rework modeset sequence for DCE41 and DCE5
(In reply to comment #4) > A patch referencing this bug report has been merged in Linux v3.3-rc2: > > commit 3a47824d85eeca122895646f027dc63480994199 > Author: Alex Deucher <alexander.deucher@amd.com> > Date: Fri Jan 20 15:01:30 2012 -0500 > > drm/radeon/kms: rework modeset sequence for DCE41 and DCE5 I can confirm that the problem no longer exists in v3.3-rc2. Closing.
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