Since updating my xsrc to the current 4.4 based one: 20 minutes after I log in 
(or maybe after the X server starts, its much the same thing) the screen 
blanks as if DPMS suspend has cut in even though I havent been idle up to 
that point.  The screen comes back as soon as you type or move the mouse.  
After that, during the session,  the screen blanks only after the appropriate 
amount of idle time.
Anybody else seeing this? Any ideas on whats going on?
Note this is independent of driver - I'm seeing it with ati, mga and i810.

cheers
mark