Here are a few different things to try:
1. Run "sudo dpkg-reconfe xserver-xorg", and choose only the 640x480
mode (or the 800x600 mode)
2. Install and run displayconfig-gtk
sudo apt-get install displayconfig-gtk
sudo displayconfig-gtk
Use this tool to select the correct graphics card and monitor.
Hopefully displayconfig-gtk will auto-detect them, but if not you can
select them from the GUI. You might try selecting Plug 'n' Play. note
that this is a new program very early in development, so it has bugs and
may not work at all. But it would be great if it can do it.
3. Tell me the make and model of your monitor, and the output from these
commands, and I'll do some more investigation:
discover --disable=serial,parallel,usb,ide,scsi --format="%V %M\t%S\t%D\n"
video
sudo ddcprobe
sudo xresprobe vesa
** Changed in: xorg (Ubuntu)
Status: Unconfirmed => Needs Info
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ATI FireGL V5200 not working at all
https://bugs.launchpad.net/bugs/118225
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