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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I have tried to hack both X11 conf /etc/X11/Xorg.conf and xfce4 conf, but all the document I can find is outdated.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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Try xrandr --output default --mode 640*480 60. This worked for me, at least until the reboot.

EDIT just found this http://forums.whirlpool.net.au/archive/666761

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Welcome to Super User! Whilst this may theoretically answer the question, it would be preferable to include the essential parts of the answer here, and provide the link for reference. – Canadian Luke Nov 16 '12 at 21:14

You can use ARandR, you can easily change your resolution using that. Instructions are available here.

enter image description here

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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 – c2h2 May 24 '12 at 7:18
    
that's not xubuntu's default (xfce) desktop, I suspect that tool might not be available (at least by default)... – nonchip Jul 14 '14 at 0:36

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