Re: Unreadable external LCD after upgrade to 2.6.32

On 03/09/2010 01:12 PM, Sam Tregar wrote:
> Hey all.  I've got a Dell Latitude E1505 running Fedora F12.  I just
> updated to 2.6.32.9-67.fc12.i686 today and as soon as I rebooted my
> external LCD was unreadable.  It had wavy vertical lines all over it
> and appeared to have less than the full vertical resolution.  The
> laptop LCD looked fine.
>
> After checking the cable, power-cycling the monitor and reseting its
> settings, and rebooting a few times didn't help, I booted back
> into 2.6.31.12-174.2.22.fc12.i686 and all was well again.  Any ideas
> what could cause this and what I might do to fix it?
>
> The display chip on this laptop is an ATI Radeon Mobility X1400 and
> I'm using the radeon driver.  Let me know if I can provide anything
> that might help - X logs, dmesg, whatever.
>
> Thanks!
> -sam
>

I have the same laptop.
What you need to do is add nomodeset to your kernel parameters in
/boot/grub/grub.conf


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