February 24th, 2015
Quite many people seem to have the same problem that I did: occasional jumpy mouse and random slowdown/freezes with X.org and Intel GMA (or newer). Dunno if the problem has been fixed already, but here’s something worth trying if system updates don’t do the trick (run as root):
echo 0 >/sys/module/drm_kms_helper/parameters/poll
Worked for me and another friend. To make it permanent, add the line to for example /etc/rc.local. The bug has something to do with X.org periodically checking for external displays, which seems to cause an irritating freeze ranging from a fraction of a second to even several seconds.
Filed under: linux