blank screen on mplayer full sceen or logout
guys i have ubuntu linux 13.04
output of uname
when i play a movie using mplayer full sceen mode , after a while it turns black .. audio is working but no video .. every other service is working well but just teh sceen is black without being able to go back ..
Linux 3.2.0-49-generic #75-Ubuntu SMP Tue Jun 18 17:40:13 UTC 2013 i686 i686 i386 GNU/Linux
when i work not in full sceen mode ,then it work ok ..
when i change the output video to "xv"
also when i logout .. black screen without being able to see or do anything although everything is working well .. i still can ssh the pc (not laptop) and do anything i want ..
when i press ctrl + alt + f1 , it just appear for a second then black screen appear again ..
here what i have made , system settings/britness&lock , cancelled screen saver and told it never to power off teh screen ..
this is part of /var/log/Xorg
so what should i do ? and how can i trace this problem from logs ?
[ 29.700] (==) Log file: "/var/log/Xorg.0.log", Time: Thu Jul 4 13:00:53 2013
[ 29.722] (==) Using system config directory "/usr/share/X11/xorg.conf.d"
[ 29.723] (==) No Layout section. Using the first Screen section.
[ 29.723] (==) No screen section available. Using defaults.
[ 29.723] (**) |-->Screen "Default Screen Section" (0)
[ 29.723] (**) | |-->Monitor "<default monitor>"
[ 29.724] (==) No monitor specified for screen "Default Screen Section".
Using a default monitor configuration.
[ 29.724] (==) Automatically adding devices
[ 29.724] (==) Automatically enabling devices
[ 29.724] (WW) The directory "/usr/share/fonts/X11/cyrillic" does not exist.
[ 29.724] Entry deleted from font path.
[ 29.725] (==) FontPath set to:
[ 29.725] (==) ModulePath set to "/usr/lib/i386-linux-gnu/xorg/extra-modules,/usr/lib/xorg/extra-modules,/usr/lib/xorg/modules"
[ 29.725] (II) The server relies on udev to provide the list of input devices.
If no devices become available, reconfigure udev or disable AutoAddDevices.