You can add “nomodeset xforcevesa” to the boot line of the LiveCD which
will use VESA driver as a fallback; this should work.
Sorry. I didn't notice that you were booting without your only display
plugged in. I'm somewhat surprised that other drivers work without any
monitor plugged in; generally they'll cry about “No connected displays”
and fail to start.
Monitors, generally, will only work after the driver has done a bunch of
work to set the display up - probing the supported resolutions, turning
on the circuitry that connects the VGA port with the framebuffer, etc.
>From what I see in your description of bug #529387, I think that in the
past Ubuntu releases X *has* been failing to start on your hardware, and
then failsafe X has been kicking in and the VESA driver has
unconditionally set up the lowest possible resolution, even though it
can't detect any monitors.
I'm not sure why this fallback hasn't been kicking in for you in Lucid;
possibly it's because the nouveau driver is claiming to provide kernel-
modesetting, which the VESA driver can't work with.
You might be able to boot at the correct resolution by adding
“video=VGA-1:800x600” (I think that's the right syntax) to the boot line
from the LiveCD, which should cause nouveau to set 800x600 as the video
mode.
I'm going to mark this bug as fixed, as X no longer crashes when the
monitor is plugged in. We can continue to track the monitor resolution
issue on bug #529387.
** Changed in: xserver-xorg-video-nouveau (Ubuntu)
Status: Incomplete => Fix Released
--
[Lucid] Xorg crashes when you plug in a monitor
https://bugs.launchpad.net/bugs/538501
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