compiz team mailing list archive

[Lasse Kärkkäinen <tronic+mb48@xxxxxxxxxx>]

Public bug reported:

Dragging windows around, playing video (vdpau, xv, gl) and OpenGL all
suffer of tearing even if the application (or nvidia-settings) has Sync
to VBlank (vsync) enabled. A tearing break consistently appears
approximately on the same position, about 40 % from the top of the
screen. This bug is seen with Nvidia proprietary drivers but googling
suggests that it does not depend on the GPU or its driver but that it is
actually a design issue with the compositing managers.

Forcing the GPU into performance mode with nvidia-settings makes no
difference (with my old GPU this would often solve tearing problems).
Toggling full screen mode also doesn't appear to change anything.

Symptoms:
- Application-side (per window) vsync is working fine
   * Window dragging, video playback and OpenGL all behave the same
- Full screen OpenGL works fine
   * Compositing bypassed?
- Compositing fails: compiz attempts syncing but the timing is wrong
   * If it was not syncing at all, the tear lines would "move" randomly
   * The buffer swap should occur during vertical blanking, not during screen refresh

Workarounds:
- Disable compositing (use different WM)

System:
- Ubuntu 12.04 LTS
- Nvidia drivers 295.49
- MSI GTX670
- Compiz 0.9.7.8
- Unity 5.12.0

** Affects: compiz (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1018105

Title:
  Tearing in Unity with Nvidia GTX670 (vsync failure)

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