[TUTORIAL] ATI HD 4250 fails with OpenGL settings

Ubuntu Precise Pangolin 12.04 64bits
Kernel 3.2.0-25

Processor AMD X3 450
GPU ATI 4250 HD
Driver Catalyst AMD proprietary driver

It also does not work with Sabayon


Loading OpenGL driver libGL.so.1
X Error of failed request: BadValue (integer parameter out of range for operation)
Major opcode of failed request: 130 (XFree86-VidModeExtension)
Minor opcode of failed request: 10 (XF86VidModeSwitchToMode)
Value in failed request: 0x17
Serial number of failed request: 58
Current serial number in output stream: 62

Try passing the parameters +vid_fullscreen 0. Then select the right resolution for your screen, enable full screen again, and click Apply.

This may happen if none of the default attempted resolutions are supported by your system.

Try passing the parameters +vid_fullscreen 0. Then select the right resolution for your screen, enable full screen again, and click Apply.

This may happen if none of the default attempted resolutions are supported by your system.

Thanks it worked, but it is unable to execute at fullscreen 1280x720, instead it switch - after changing settings - to 1024x768 - and not full screen, as it were a 4:3 screen and I can see part of my desktop.

But alt least it works

Let's try the old fashioned way then:
Run Xonotic from the command line and add '-width 1280 -height 720' and see what happens. This is the old GLQuake way of setting resolutions.