[Bug 44955] New: Screen flickers after LVDS turned off and back on with MacBook Pro 8,2 (Radeon HD 6600M)
https://bugs.freedesktop.org/show_bug.cgi?id=44955
Bug #: 44955 Summary: Screen flickers after LVDS turned off and back on with MacBook Pro 8,2 (Radeon HD 6600M) Classification: Unclassified Product: DRI Version: unspecified Platform: x86-64 (AMD64) OS/Version: Linux (All) Status: NEW Severity: normal Priority: medium Component: DRM/Radeon AssignedTo: dri-devel@lists.freedesktop.org ReportedBy: seth.forshee@canonical.com
Created attachment 55810 --> https://bugs.freedesktop.org/attachment.cgi?id=55810 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.
https://bugs.freedesktop.org/show_bug.cgi?id=44955
--- Comment #1 from Seth Forshee seth.forshee@canonical.com 2012-01-19 12:22:43 PST --- Created attachment 55811 --> https://bugs.freedesktop.org/attachment.cgi?id=55811 vbios
https://bugs.freedesktop.org/show_bug.cgi?id=44955
--- Comment #2 from Alex Deucher agd5f@yahoo.com 2012-01-19 13:02:49 PST --- Do these patches help? http://people.freedesktop.org/~agd5f/dce_fixes/ They are against drm-next or Linus' tree.
https://bugs.freedesktop.org/show_bug.cgi?id=44955
--- Comment #3 from Seth Forshee seth.forshee@canonical.com 2012-01-19 18:11:28 PST --- (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.
https://bugs.freedesktop.org/show_bug.cgi?id=44955
--- Comment #4 from Florian Mickler florian@mickler.org 2012-02-01 13:14:20 PST --- 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
https://bugs.freedesktop.org/show_bug.cgi?id=44955
Seth Forshee seth.forshee@canonical.com changed:
What |Removed |Added ---------------------------------------------------------------------------- Status|NEW |RESOLVED Resolution| |FIXED
--- Comment #5 from Seth Forshee seth.forshee@canonical.com 2012-02-01 13:35:53 PST --- (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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