[Bug 772465] [NEW] Snow artifacts in kwin under NVIDIA proprietary driver

Maia Kozheva 772465 at bugs.launchpad.net
Thu Apr 28 15:36:01 UTC 2011

Public bug reported:

Binary package hint: kdebase-workspace

After an upgrade to Natty stable, I found that the stability of the
graphical system degraded significantly when using KWin with the NVIDIA
proprietary driver (tested with nvidia-current 270.30 to 270.41.06 on a
GeForce GT 240).

Graphical artifacts (colored dots, aka snow) appear when moving windows
or playing videos with desktop effects enabled. When they are disabled,
different kinds of artifacts, along with flicker, appear on window
borders instead. In addition, in both modes, opening or resizing a
window sometimes causes the entire system to freeze.

If these artifacts are present, switching to another window manager
(like Compiz) does not fix them, but switching the window manager in KDE
settings and rebooting does. I could not reproduce this bug when booting
with Metacity or Compiz, or with KWin under Nouveau 2D or Gallium.

The bug seems to have gone away in KWin after I unset the "Use VSync"
checkbox in desktop effects settings and rebooted.

** Affects: kdebase-workspace (Ubuntu)
     Importance: Undecided
         Status: New

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  Snow artifacts in kwin under NVIDIA proprietary driver

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