For some reason the screen resolution of my laptop Fujitsu ESPRIMO Mobile D9500 went wrong.
The reason I don't know. Probably something went wrong with writing on the hdd.
Checking with xrandr:
xrandr: Failed to get size of gamma for output default
Screen 0: minimum 800 x 600, current 1024 x 768, maximum 1024 x 768
default connected primary 1024x768+0+0 0mm x 0mm
The available resolution should be: 1280 x 800 ( WXGA )
What to do?
Is there any easy way to correct? For example to reinstall all the packages responsible for the screen?