Unable to change resolution - Linux

[Dusko]

I cannot change resolution on Linux Mint 14. When i run xrandr, it output's:

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 1024x768+0+0 0mm x 0mm
1024x768 61.0*
800x600 61.0
I'm using AMD 7670m graphic card. I installed Catalyst 12.1 but it didnt solved my problem.

[cwsnyder]

You may want to read the responses to this thread: http://forum.linuxmint.com/viewtopic.php?f=59&t=111745

[flashbuddy56]

basic driver is just that, the basic driver,as long as you can see a desktop that's about all it douse.
sadly most of the unix os iv messed with so far cant even support a 20 year old video card and don't have drivers for them.
they support the video hardware in question in software mode only.
long story short install drivers and sadly its a real princess to do,im still working on that topic my self after a week of being at it

[cwsnyder]

I found out something: To fix the "Failed to get size of gamma for output default" error, enter a dummy gamma entry on a line setting your output resolution, for example:

Code: Select all

xrandr --output default --gamma 1:1:1 --mode 1024x768

This can be the last line in a three line triplet of xrandr --newmode <modename> <frequency & pixel setting numbers> setting a new mode line on the first line, xrandr --addmode default <modename> and then the third line with both gamma and mode settings.