Snow artifacts in kwin under NVIDIA proprietary driver

Bug #772465 reported by Maia Everett
38
This bug affects 8 people
Affects Status Importance Assigned to Milestone
nvidia-graphics-drivers (Ubuntu)
Expired
Undecided
Unassigned

Bug Description

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.

Tags: kubuntu natty
Revision history for this message
_kai_ (gpayo) wrote :

I must say I have the issue. Whenever I write something in a text box in the browser (like right now) all kind of weird dots appears on the screen.

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mityi (mityi) wrote :

I can confirm this issue

Revision history for this message
piter (phlawski) wrote :

Exactly the same on my machine. My graphics card is NVIDIA Quadro FX 380. After first upgrading to 11.04 artifacts has appeared and only disabling VSync have helped. Now after first update which has come (4.6.2a-0ubuntu5.1) even disabling VSync does not help.

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Dave Steffenn (dgsteffen) wrote :

Ditto here -- I'm on a laptop with a GeForce GTS 250M/PCI/SSE2. Typically things will be well behaved for the first few minutes, then snow or "static" all over the place. Seems to have gone away with the "Use VSyc" flag as well, but we'll see.

Thanks!

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Dave Steffenn (dgsteffen) wrote :

Update -- the VSyc flag doesn't help. I changed from kdm to gdm, the problem persists. Anybody have any ideas?

Thanks

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Launchpad Janitor (janitor) wrote :

Status changed to 'Confirmed' because the bug affects multiple users.

affects: kdebase-workspace (Ubuntu) → kde-workspace (Ubuntu)
Changed in kde-workspace (Ubuntu):
status: New → Confirmed
Revision history for this message
Martin Gräßlin (ubuntu-martin-graesslin) wrote :

This is clearly a driver issue as illustrated by the fact that it does not happen with Gallium

Revision history for this message
Launchpad Janitor (janitor) wrote :

Status changed to 'Confirmed' because the bug affects multiple users.

affects: kde-workspace (Ubuntu) → nvidia-graphics-drivers (Ubuntu)
Changed in nvidia-graphics-drivers (Ubuntu):
status: New → Confirmed
bugbot (bugbot)
tags: added: kubuntu
Changed in nvidia-graphics-drivers (Ubuntu):
status: New → Confirmed
madbiologist (me-again)
tags: added: natty
Revision history for this message
madbiologist (me-again) wrote :

Does this still happen on Ubuntu 12.04 "Precise Pangolin" with driver version 295.49-0ubuntu0.1 ?

Changed in nvidia-graphics-drivers (Ubuntu):
status: Confirmed → Incomplete
Revision history for this message
bugbot (bugbot) wrote :

We're closing this bug since there has not been a response from the original reporter. However, the issue still exists please feel free to reopen with the requested information. If you're not the original reporter, we'd prefer you file a new bug report.

Some tips:

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  * See https://wiki.ubuntu.com/X/Reporting for tips on writing good bug reports.

Changed in nvidia-graphics-drivers (Ubuntu):
status: Incomplete → Expired
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