How to force 640*480@60Hz screen resolution on xubuntu 12.04

Posted by c2h2 on Super User See other posts from Super User or by c2h2
Published on 2012-05-24T06:43:19Z Indexed on 2012/12/20 11:05 UTC
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Filed under:

resolution

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xorg

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vga

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xubuntu

It seems xubuntu won't be able to correctly set resolution at 640*480@60Hz at its Display settings. And I am unable to correctly my super small 6.4 inch Mitsubishi VGA panel via VGA cable.

I have tried to hack both X11 conf /etc/X11/Xorg.conf and xfce4 conf, but all the document I can find is outdated. and conf files are changed into other location.

Can someone give me a hand and I'll mark correct for other people to use? Thanks!

EDIT: The board is an Intel Atom D2700, gpu is SGX545.

I tried to use xrandr --output default --mode 640*480 It seems works fine, but refresh rate is 75Hz, but the screen only suports 60Hz

So I used xrandr --output default --mode 640*480 --rate 60 but it give error:

xrandr: Failed to get size of gamma for output default

Can anyone pointing any directions?

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