Display issue

[Christoph Bier]

Ollie Killingback schrieb am 21.03.2010 15:11:

> Up to yesterday I had a desktop (running Ubuntu 9.04) and a laptop
> (running Ubuntu 9.10) in my study.  The laptop had a second monitor
> attached, which I found handy.  I converted the desktop to a
> file/print/web server and decided that the big screen attached would
> be better used as the second monitor for my laptop, as it was no
> longer needed on the server.
> 
> * With the laptop powered down I detached the second monitor and
> replaced it with the larger one from the former desktop and booted.
> * It refused to boot.
> * I detached the 2nd monitor and it booted fine.
> * I attached the 2nd monitor and opened Display and both screens went
> blank.  Nothing I could do would recover.
> * I detached the 2nd monitor and rebooted, and everything is normal
> again, but I miss my 2nd monitor.
> 
> I could re-attach the original 2nd monitor to the laptop, but as the
> other one is bigger and was working fine on the former desktop, using
> it as the laptop 2nd monitor makes sense.  I see no reason for Ubuntu
> to fall over because of a monitor.  It was fine with the other 2nd
> monitor.
> 
> I'd be grateful for suggestions as to how to fix this.

I don't know how to fix it. But the problem might occur because your
graphics is not capable of the higher resolution as a result of the
bigger monitor. And maybe X.org can't detect the monitor settings.
Any errors in /var/log/Xorg.0.log after a failed boot process?

Can you disable your graphics port where the external monitor is
attached (e. g. with ThinkPad you can cycle through different states
with Fn-F7)?

Best
Christoph
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