Same happens here on Kubuntu 10.10 almost every day. Kwin effects are enabled.
I'll attach a log sample from yesterday (egrep -i "i915|intel" kern.log | grep "Nov 23")
# uname -a Linux gaia2 2.6.35-22-generic #35-Ubuntu SMP Sat Oct 16 20:45:36 UTC 2010 x86_64 GNU/Linux
Unfortunately Xorg.log was rotated out but I'll upload one from today anyway.
Let me know what else do you need.
Same happens here on Kubuntu 10.10 almost every day. Kwin effects are enabled.
I'll attach a log sample from yesterday (egrep -i "i915|intel" kern.log | grep "Nov 23")
# uname -a
Linux gaia2 2.6.35-22-generic #35-Ubuntu SMP Sat Oct 16 20:45:36 UTC 2010 x86_64 GNU/Linux
Unfortunately Xorg.log was rotated out but I'll upload one from today anyway.
Let me know what else do you need.