Bug 34802

Summary: [radeon] Screen blinking when reclocking (especially with dynpm power method)
Product: Drivers Reporter: txdevel
Component: Video(DRI - non Intel)Assignee: drivers_video-dri
Status: RESOLVED OBSOLETE    
Severity: normal CC: alan, hayarms
Priority: P1    
Hardware: All   
OS: Linux   
Kernel Version: 2.6.39 Subsystem:
Regression: No Bisected commit-id:

Description txdevel 2011-05-10 07:13:45 UTC 
It's always happen when clocks changes. In this moment I observe a colored vertical lines during 1 second. When I change power method or power profile manually it's happens one time too.
The lines like this: http://radeon.koolfy.be/wp-content/uploads/2011/03/garbage.jpg

$ lspci | grep -i vga
01:00.0 VGA compatible controller: ATI Technologies Inc Madison [Mobility Radeon HD 5000 Series]
Comment 1 hayarms 2011-06-08 00:45:17 UTC 
It happens to me too, and I think it happens to everyone.

It is a very well known bug.

As a temporary workaround I use the profile power_method with the low profile. It doesn't hurt the performance of my desktop even when using composinting and I can always set to "high" the card with a script when I need more power (like running heavy 3d programs). Anyway, I have a 5850 card, so people with a lower end card may not find the low profile suitable for them.