Red Hat Bugzilla – Bug 582866
Window side edges tear when moved horizontally
Last modified: 2011-06-27 11:37:47 EDT
Created attachment 406971 [details]
dmesg (w/o drm.debug=15) Xorg.0.log.gz Xorg.1.log.gz
Description of problem: Both sides of a moving window tear when moved horizontally faster than about 20mm/sec. Width of tears proportional to window movement speed, maximizing at about 5mm. It is similar to a bar graph with a single bar on each edge; with perhaps three overlapping bars elongating upward as window moved, elongation always upward. Could take a camera movie if necessary. Window's four edges at all times smooth. Top/bottom edges always correct. Konsole, gnome terminal, firefox; all windows seem impacted. With compositing manager on or off in Gnome. Dialog boxes (such as closing PySolFC) do not seem affected though size and smoothness of the dialog may hinder observation.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1. Move a window with a horizontal component to motion when using the nouveau driver.
No graphic artifacts when a window is moved.
Additional info: Fully patched Branch desktop on (100416:02 UTC); upgraded from F11 using preupgrade. No xorg.conf file present. Test results posted to Test_Day:2010-04-13_Nouveau.
This bug appears to have been reported against 'rawhide' during the Fedora 14 development cycle.
Changing version to '14'.
More information and reason for this action is here:
I presume the tearing doesn't persist (ie. you see it temporarily, then it disappears)?
Yes, occurs only when moving a window horizontally. It has actually improved quite a bit on latest release (0.0.16-8.20100423git13c1043.fc13) and perhaps not an issue anymore. It is now most noticable with windows having a scroll bar (although occurs all windows and on both sides). It is really just the sides, body of window is fine. Again, I could take a movie if you desire. I have f14 and will check on that OS and report.
Without seeing how this looks in person, it's hard to tell if this is a bug. Seeing some amount of "tearing" is expected (especially without a composite manager) as there's no way to avoid a small delay between copying the original contents to somewhere new, and redrawing the background/whatever in the previous window position.
The faster your GPU is, the less likely it is you'll notice this.
Ron: sounds like a video might be a good idea.
On current Fedora 14 I have the tearing problem.
The window corrupts. A short time with google-chrome, 2-3 seconds and with gnome-terminal until force redraw by resizing window or ctrl-l. ctrl-l does not redraw the window frame.
Any movement other than very slow will produce effect. Very slow movement when dragging to second monitor will produce effect.
Other issues that may be related:
I start X from init 3 with startx.
If I exit X key board input and locks up with background on screen.
If I ctrl-alt-f1 and ctrl-c I can take the machine down normally, but if I ctrl-alt-f7 I no longer have keyboard input and have a blank screen.
I also have the missing mouse pointer issue, but not for a week or so and then only with dual head. One head has pointer and other head does not. In clone mode same issue.
Created attachment 471905 [details]
Screen shot of tearing
Um, I can move a window to the right as fast as I want with no tearing. Only moving to the left corrupts/tears.
(In reply to comment #8)
> Um, I can move a window to the right as fast as I want with no tearing. Only
> moving to the left corrupts/tears.
I believe this is likely a completely different bug.
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