Ubuntu 12.04 w/unity - Mouse lag
Solution 1:
I've run into this before, and this fixed it for me. However, I've just changed this back to the original state, and it doesn't seem to be re-appearing. Perhaps it has been made moot by an upgrade -- but here's the process I used to fix it.
If you are running into the problem now, and just want to test real quick if this fix works, you can do the temporary:
sudo sh -c 'echo N > /sys/module/drm_kms_helper/parameters/poll'
To keep this change, do:
sudo sh -c 'echo "options drm_kms_helper poll=0" >> /etc/modprobe.d/local.conf'
sudo update-initramfs -u
Solution 2:
I had the same issue (nVidia 9600m GT card), but only with NOUVEAU drivers (strange enough, previous ubuntu/nouveau versions works ok). I noticed the issue when mouse cursor is in "busy state" (the spinning animation), so i think there is something in cursor hw acceleration. Anyway, i solved using nvidia binary driver, "current-updates" version.