Bug 79488 - Checkerboard tearing on Radeon card
Summary: Checkerboard tearing on Radeon card
Status: NEW
Alias: None
Product: DRI
Classification: Unclassified
Component: DRM/Radeon (show other bugs)
Version: unspecified
Hardware: Other All
: medium normal
Assignee: Default DRI bug account
QA Contact:
URL:
Whiteboard:
Keywords:
Depends on:
Blocks:
 
Reported: 2014-05-31 18:11 UTC by Dan Doel
Modified: 2014-05-31 18:13 UTC (History)
0 users

See Also:
i915 platform:
i915 features:


Attachments
dmesg while the machine is in the 'tearing' state (259.51 KB, text/plain)
2014-05-31 18:11 UTC, Dan Doel
no flags Details
xorg log during the tearing (235.81 KB, text/plain)
2014-05-31 18:13 UTC, Dan Doel
no flags Details

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Description Dan Doel 2014-05-31 18:11:44 UTC
Created attachment 100211 [details]
dmesg while the machine is in the 'tearing' state

For several months now, I've occasionally run into situations where my screen displays a strange artifact or tearing pattern. It is only visible when things are changing, of course, and it looks like the monitor is divided into small squares, and two different 'frames' are drawn alternately. Here is a video of the problem I took back at the end of February:

  https://www.youtube.com/watch?v=e2T8BeE0j74

I've just encountered this again, and it reminded me to finally post a bug.

You'll notice that the video was recorded on a cell phone. I tried using a desktop recorder (the one built into gnome-shell) and the resulting video did not display the artifacts. So it would seem to be happening at a level below what capture can detect.

I'll attach dmesg and xorg logs from when the problem is happening. You'll see that there are lots of page flip errors in both. However, I think that actually might be a red herring. Doing a tail -f on the logs, I can cause artifacts to display (for instance, selecting a different channel in my irc client, causing highlighting to change, which briefly displays checkerboard highlights) without a corresponding xorg error. And I also frequently see those errors accompanied by ordinary tearing. But I can't definitively say that they aren't related, either.

I'm using:

  mesa from git as of about a week ago (rev 63069)
  latest glamor (as of 2014-03-13)
  xf86-video-ati 7.3.0
  kernel 3.14.4

But this has been happening for significantly longer than just those versions.

I have a Radeon HD 7870 (pitcairn).

I'm not certain that I've assigned this bug to the right project, although at least some of the visible errors involve drm. Apologies if it's the fault of something else, though.
Comment 1 Dan Doel 2014-05-31 18:13:14 UTC
Created attachment 100212 [details]
xorg log during the tearing


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