I can't get over a resolution of 640x480 after upgrading to 12.04, how can I fix it?

Posted by Sandeep Srivastava on Ask Ubuntu See other posts from Ask Ubuntu or by Sandeep Srivastava
Published on 2013-10-19T15:26:29Z Indexed on 2013/10/19 16:09 UTC
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resolution

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monitor

Ever since I upgraded to 12.04 my screen resolution has gone down to 640 x 480, even though I had higher resolutions before. My xrand output looks as below :

sandeep@sandeep-desktop:~$ xrandr
xrandr: Failed to get size of gamma for output default
Screen 0: minimum 640 x 480, current 640 x 480, maximum 640 x 480
default connected 640x480+0+0 0mm x 0mm
   640x480         0.0*

How can I get higher resolutions, I know that my monitor support higher resolutions.

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