video tearing in Unity, Gnome Shell is fine
Bug #881685 reported by
Tomek Bury
This bug report is a duplicate of:
Bug #880707: [regression] Compiz: Visible tearing is worse in 11.10 than 11.04, even when "Sync To VBlank" is enabled, but only when Unity is active..
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This bug affects 2 people
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
Unity |
Confirmed
|
Low
|
Unassigned | ||
unity (Ubuntu) |
Confirmed
|
Low
|
Unassigned |
Bug Description
Video playback shows plenty of tearing. I'm using Dell XPS M1530 laptop running Ubuntu 11.10 and nvidia-current driver.
The best way to verify the bug is to download this video:
$ youtube-dl http://
and than play it back with totem in full screen:
$ totem IRe9ykSfXyQ.mp4
I've tried Unity, Gnome Shell and Gnome 2 sessions. Apparently and all but Unity work fine. I've tried all known workarounds including ccsm settings (sync to vblank, unredirect full-screen, forced refresh rate, legacy fullscreen, force bufer swap) and nvidia-settings (vblank sync in GL and XVideo, load at startup) but no luck.
affects: | ubuntu → unity (Ubuntu) |
Changed in unity (Ubuntu): | |
importance: | Undecided → Low |
Changed in unity: | |
importance: | Undecided → Low |
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I've just noticed that xrandr reports 50Hz refresh rate of laptop's panel but glxgears runs at 60 FPS but claims it's synchronised with the panel. Also moving glxgears window is very laggy. The window freezes when I start dragging it and appears in the new place about a second after I stop moving the mouse (touchpad).
I'm happy to provide any additional information you may need or run some tests with various settings or source code modifications if that helps to pinpoint the source of the tearing issue and get rid of it once and for all.