I looked at this question but it fails at the second step.
I enter sudo xrandr --newmode "1280x800_60.00" ... and the Output sais:
xrandr: Failed to get size of gamma for output default
X Error of failed request: BadName (named color or font does not exist)
Major opcode of failed request: 140 (RANDR)
Minor opcode of failed request: 16 (RRCreateMode)
Serial number of failed request: 19
Current serial number in output stream: 19
any Ideas how to fix my problem? thanks my notebook
I tried to change the gamma with sudo xrandr --output default --gamma 2:2:1 but the output just sais: xrandr: Gamma size is 0.