Nemohu zvolit jine rozliseni nez 1024x768
karel@ThinkPadT520:~$ xrandr
xrandr: Failed to get size of gamma for output default
Screen 0: minimum 1024 x 768, current 1024 x 768, maximum 1024 x 768
default connected 1024x768+0+0 0mm x 0mm
1024x768 61.0*
Dekuji za rady