Bug 42787

Summary: Video flickers on X1200 / RS690 over DVI
Product: Drivers Reporter: Stephan Diestelhorst (stephan.diestelhorst)
Component: Video(DRI - non Intel)Assignee: drivers_video-dri
Status: RESOLVED OBSOLETE    
Severity: normal CC: alan, stephan.diestelhorst, xerofoify
Priority: P1    
Hardware: All   
OS: Linux   
Kernel Version: 3.4.22 Subsystem:
Regression: No Bisected commit-id:
Attachments: dmesg of flickering system

Description Stephan Diestelhorst 2012-02-16 22:14:02 UTC 
I still experience flickering on the DVI of my on-board graphics card if I set the mode to 1920x180 (ragrdless which timing 59.9 / 60 Hz).  Tried both KMS / UMS, no real difference.  AFAICS, all pathes in other bug reports should be picked up by now.  It seems that graphics activity (moving a translucent window) is more prone to blanking the display.

Killing upowerd does not help, so it is not a polling issue.  CPU is is not properly detected by the BIOS (too old, no upgrade available), so it may (?) be that some registers (MTRRs?) are not set up properly.

Reducing the resolution does seem to help.
Comment 1 Michel Dänzer 2012-02-17 13:01:31 UTC 
Let's focus on KMS here.

Please attach the dmesg output.

Does radeon.disp_priority=2 help, or forcing a reduced blanking mode?
Comment 2 Stephan Diestelhorst 2012-12-26 12:36:18 UTC 
Tried radeon.disp_priority=2 and video=1920x1080MR@60 and I can still see the flicker.  Will attach a dmesg.
Comment 3 Stephan Diestelhorst 2012-12-26 12:40:46 UTC 
Created attachment 89691 [details]
dmesg of flickering system
Comment 4 xerofoify 2014-06-25 02:15:32 UTC 
Please check if this bug is still on newer kernel releases.
Otherwise you should this bug as it's now fixed:)
Cheers Nick
Comment 5 Stephan Diestelhorst 2014-07-03 20:27:23 UTC 
Closing, since I do not own the hardware in question anymore.