ubuntu-x-swat team mailing list archive

[Tim Holy <holy@xxxxxxxxx>]

I have now installed Lucid on a new hard drive, and with a bit more
experience I can amplify this report a bit. It turns out that this
largescreen monitor also fails even if the monitor is connected after
the boot process, IF compositing is turned on. The only reliable way to
get the monitor to work is to first turn desktop effects off. However,
if I turn desktop effects off (in Kubuntu's SystemSettings->desktop) and
then reboot with the monitor connected, this is not sufficient to fix
the boot problem: I still get the "wiggly lines" on the kdm login screen
(and thereafter).

I wonder if specific problems during booting might have something to do
with compositing being on at some point during the process, before my
own configuration turns it off?

I think the reason I didn't notice this extra twist when I was trying
the live CD is that compositing must have been auto-disabled; I have
noticed that happening frequently on its own. I now just turn off
desktop effects all the time and wait to connect the monitor until after
I have logged in. These steps appear to work around the problem.

-- 
Modesetting fails if large screen monitor attached at boot
https://bugs.launchpad.net/bugs/570011
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