https://bugzilla.kernel.org/show_bug.cgi?id=29272
Summary: [BISECTED] Screen becomes corrupted when switching video mode with Radeon KMS Product: Drivers Version: 2.5 Kernel Version: 2.6.38-rc5 Platform: All OS/Version: Linux Tree: Mainline Status: NEW Severity: high Priority: P1 Component: Video(DRI - non Intel) AssignedTo: drivers_video-dri@kernel-bugs.osdl.org ReportedBy: jlp.bugs@gmail.com CC: alexdeucher@gmail.com Regression: Yes
After updating the kernel to 2.6.38-rc5 screen gets corrupted when video mode switches for KMS. This is on laptop eMachines E640G with integrated ATI Mobility Radeon HD 5470. It was working just fine with -rc4. I have bisected the commits and this one was pointed out as the culprit:
5b40ddf888398ce4cccbf3b9d0a18d90149ed7ff is the first bad commit commit 5b40ddf888398ce4cccbf3b9d0a18d90149ed7ff Author: Alex Deucher alexdeucher@gmail.com Date: Mon Feb 14 11:43:11 2011 -0500
drm/radeon/kms: hopefully fix pll issues for real (v3)
The problematic boards have a recommended reference divider to be used when spread spectrum is enabled on the laptop panel. Enable the use of the recommended reference divider along with the new pll algo.
v2: testing options
v3: When using the fixed reference divider with LVDS, prefer min m to max p and use fractional feedback dividers.
Fixes: https://bugzilla.kernel.org/show_bug.cgi?id=28852 https://bugzilla.kernel.org/show_bug.cgi?id=24462 https://bugzilla.kernel.org/show_bug.cgi?id=26552 MacbookPro issues reported by Justin Mattock justinmattock@gmail.com
Signed-off-by: Alex Deucher alexdeucher@gmail.com Cc: stable@kernel.org Signed-off-by: Dave Airlie airlied@redhat.com
:040000 040000 8736f993b97cc8370fd29048761a1e0da4969306 657bdb221e3f4da6efdfec02f8f348db5a537b29 M drivers