Screen goes black but set not to in preferences

Sunday, 3 April 2011

Hi,

my laptop's (Thinkpad X201t) screen goes black if I don't use it for
some time (between 6 and 15 minutes). In the gnome power management
preferences the option "Put display to sleep when inactive for" is set
to never - for both "On AC Power" and "On Battery Power".

This also happens if watching a movie using totem.

If an external monitor is connected both screens go black but the
external one gets back on after like 3 seconds.

Video card:
00:02.0 VGA compatible controller: Intel Corporation Core Processor
Integrated Graphics Controller (rev 02)

CPU model name:
Intel(R) Core(TM) i7 CPU L 620  @ 2.00GHz

Package Versions:
xorg-x11-server-Xorg.x86_64        1.9.4-1.fc14
xorg-x11-drv-intel.x86_64          2.12.0-6.fc14.1         
kernel.x86_64                      2.6.35.11-83.fc14

I've tried setting some X.org config stuff I've found search the web
about this problem: (here quote from Xorg.0.log)
[    51.714] (**) Option "BlankTime" "0"
[    51.714] (**) Option "StandbyTime" "0"
[    51.714] (**) Option "SuspendTime" "0"
[    51.714] (**) Option "OffTime" "0"

But it seems nothing changed.

I am really happy for any pointers anyone can provide how to solve this.

Thank you in advance,
 Florian