Sorry for my really late answer, but I was unable to stop using my pc
and make tests for this problem.
Today I put Ubuntu Lucid 10.04 beta 2 on my USB key and I booted on my
pc. While the violet screen did appear, when the boot started the screen
became plainly black (not even "out of range"). Trying to change tty
with ctrl-alt-F1 or other F buttons did not help at all.
I tried Alberto Milone's hint, but the only thing that changed is that
before plymouth has to start, I see a blinking cursor for a second or
two.
So, if with Karmic and Jaunty booting with my monitor with the live cd
was hard, now it's completely impossible.
As a test, i also booted with the USB key on a new VAIO notebook I am
working on, and everything worked flawlessly.
The hardware status of the pc is always the same: Radeon X1250
integrated video, Hansol H750 LCD monitor.
** Changed in: xserver-xorg-video-ati (Ubuntu)
Status: Invalid => Incomplete
--
[RS600] Monitor "out of range" with Hansol H750 on radeon X1250
https://bugs.launchpad.net/bugs/340602
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