Created attachment 120202 [details]
I have to restart my X server every couple weeks on my Thinkpad X201s these days, because after a while, something happens (my gut tells me some kind of memory-management issue, but I really have no idea) that causes serious display corruption:
I attached a snapshot of this web-page as I'm trying to blind-type into it.
Once the problem appears (typically in Firefox, but not always), restarting Firefox makes no difference. And the problem also affects other applications (even if they were started before). Only restarting the X server helps.
Created attachment 120203 [details]
As a starting point, please build yourself http://cgit.freedesktop.org/xorg/driver/xf86-video-intel/