kwin_x11 needs KWIN_EXPLICIT_SYNC=0 until a bug is fixed on kubuntu vivid

Bug #1451280 reported by Sergio Callegari on 2015-05-04
This bug affects 2 people
Affects Status Importance Assigned to Milestone
One Hundred Papercuts
kwin (Ubuntu)

Bug Description

kwin_x11 (KDE 5) fails badly on older NVIDIA graphics using the nvidia proprietary driver (304). Seen on Geoforce 7025.

Users on this configuration see kwin freezing and cannot perform any operation.

A fix is coming, but has not yet landed. In the meantime setting KWIN_EXPLICIT_SYNC is an effective workaround.

See for instructions.

I think that the workaround should be delivered ASAP on kubuntu vivid, otherwise a quota of users remains with an unusable box.

Launchpad Janitor (janitor) wrote :

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

Changed in ubuntu:
status: New → Confirmed
Jan W (ubuntu-kiekerjan) on 2015-05-15
tags: added: legacy nvidia plasma5
tags: added: kubuntu
Logan Rosen (logan) on 2015-05-20
affects: ubuntu → kwin (Ubuntu)
Sergio Callegari (callegar) wrote :

Still present with kwin_x11 4:5.3.2-0ubuntu1~ubuntu15.04~ppa1.

See also

Jan W (ubuntu-kiekerjan) on 2015-11-20
tags: added: wily
Changed in kwin (Ubuntu):
importance: Undecided → High
Changed in hundredpapercuts:
status: New → Confirmed
importance: Undecided → High
Jan W (ubuntu-kiekerjan) wrote :

For the record, because it took me some time to find, I created file /etc/profile.d/ with content:

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