I need some help fixing my resolution. It's stuck at 1024x768, but yesterday it was working well on 1280x1024. I'm using ATI HD2600, and I know that XUbuntu has some problems with ATI.I want to add 1280x1024 resolution.

Here is the output of xrandr:

Screen 0: minimum 320 x 200, current 1024 x 768, maximum 8192 x 8192

DIN disconnected (normal left inverted right x axis y axis)

DVI-0 disconnected (normal left inverted right x axis y axis)  

DVI-1 connected 1024x768+0+0 (normal left inverted right x axis y axis) 0mm x 0mm

1024x768       60.0*     

800x600        60.3     56.2     

848x480        60.0      

640x480        59.9

xorg.conf is also missing from it's location. Also I tried adding:

xrandr --addmode VGA1 1280x1024

xrandr --addmode LVDS 1280x1024

and it didn't work either. I tried installing Catalyst from AMD but still no luck with it. I'm a noob on Ubuntu, and I can't find any solutions to this, please help me!