On Tue, Jan 11, 2011 at 14:33, Pavel Machek <pavel at ucw.cz> wrote: >> I can reproduce the problem easily by: >> xset dpms force standby; sleep 3s; xset dpms force on > > (You are using "vesa" or "fbcon" X11 driver, right? I seen same problem > until I switched to "intel" X11 driver). No, the "intel".