Bug 24124 - Massive flickering with KMS enabled at 1600x1200@85 and 1280x1024@85
Summary: Massive flickering with KMS enabled at 1600x1200@85 and 1280x1024@85
Status: RESOLVED FIXED
Alias: None
Product: DRI
Classification: Unclassified
Component: DRM/Radeon (show other bugs)
Version: XOrg git
Hardware: Other All
: medium normal
Assignee: Default DRI bug account
QA Contact:
URL:
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Depends on:
Blocks:
 
Reported: 2009-09-23 14:19 UTC by Adam K Kirchhoff
Modified: 2009-12-19 10:57 UTC (History)
0 users

See Also:
i915 platform:
i915 features:

Attachments
Xorg.0.log file with KMS enabled (70.15 KB, text/plain)
2009-09-23 14:19 UTC, Adam K Kirchhoff 		no flags Details
xrandr --verbose with KMS enabled. (9.32 KB, text/plain)
2009-09-23 14:19 UTC, Adam K Kirchhoff 		no flags Details
Xorg.0.log file with KMS enabled on HD3450 (56.92 KB, text/plain)
2009-09-23 17:00 UTC, Adam K Kirchhoff 		no flags Details
View All

Description Adam K Kirchhoff 2009-09-23 14:19:19 UTC 
My ViewSonic G220fb is immediately switched to 1600x1200@85 with KMS enabled.  As soon as this happens, the entire contents start to massively flicker.  Once in Xorg, the flickering continues.  It also continues if I switch to 1280x1024@85, though both 1600x1200@75 and 1280x1024@75 work just fine.

Without KMS enabled, I can use both resolutions in Xorg @85 without any flickering.

You can clearly see the flickering in this video:

http://adam.npark.com/kms-flickering.mpg
Comment 1 Adam K Kirchhoff 2009-09-23 14:19:43 UTC 
Created attachment 29817 [details]
Xorg.0.log file with KMS enabled
Comment 2 Adam K Kirchhoff 2009-09-23 14:19:56 UTC 
Created attachment 29818 [details]
xrandr --verbose with KMS enabled.
Comment 3 Adam K Kirchhoff 2009-09-23 17:00:15 UTC 
This same combination of monitors works fine with an HD3450 and drm-next.  No flickering at @85.  Attaching Xorg.0.log file.
Comment 4 Adam K Kirchhoff 2009-09-23 17:00:45 UTC 
Created attachment 29819 [details]
Xorg.0.log file with KMS enabled on HD3450
Comment 5 Adam K Kirchhoff 2009-11-09 17:03:44 UTC 
FYI, this is still an issue as of 2.6.31.5, and also happens with an x850.
Comment 6 Alex Deucher 2009-12-14 15:36:56 UTC 
Is this still an issue with the new pll code in drm-radeon-next?
Comment 7 Adam K Kirchhoff 2009-12-19 10:57:48 UTC 
1600x1200@85.00, no with no flickering :-)

Adam

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