Public bug reported:
System: kubuntu 9.04 Beta (dist-upgraded from 8.10), amd64, NVidia GeForce 9300
(integrated gpu).
Packages: all up to date, nvidia-glx-180 version 180.44-0ubuntu1, xorg-xserver
version 1:7.4~5ubuntu18
After logging in, just when the kde desktop shows, the system becomes
completely unusable: either it totally freezes (only a hard reboot
helps), or big black rectangles appear in various places, or the mouse
moves a tiny bit and then gets stuck for a few seconds before it can
move a tiny bit more etc., or the mouse moves freely but doesn't
interact with anything.
In one of the times when the mouse did respond but with very long lags,
I've managed to eventually run top and saw xorg taking 100% cpu. A
couple times I got a notification that compositing is taking up too much
cpu and will be automatically disabled, after which the system was sort
of usable but with display refresh problems. This gave me the idea of
disabling desktop effects, after which the system is back to normal (but
without the effects, of course).
I've come across various similar bug reports, but they are either
specific to Intel chipsets, or closed as fixed, or relate to disabling
direct rendering - all of which are not relevant to this problem which
still occurs with a fully updated system.
Note that the previous configuration had the 177 nvidia drivers with
Intrepid and there was no such problem. In jaunty I can't seem to revert
to the 177 drivers - they don't appear to exist in the repositories.
** Affects: ubuntu
Importance: Undecided
Status: New
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kubuntu unusable with desktop effects - xorg takes 100% cpu
https://bugs.launchpad.net/bugs/357577
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