On Tue, 2012-07-10 at 13:34 +0100, David Crick wrote:
> This update caused one of my machines not to launch X.
> 
> Pulling the recent batch of 6.3 security updates:
> 
> Machine A:
> # yum clean all
> # yum update
> 
> everything went through fine.  Re-boot for good luck
> and all as normal.
> 
> 
> Machine B:
> # yum clean all
> # yum update
> 
> dependancy conflict between xorg-x11-server and
> gnome-screensaver
> 
> # yum --skip-broken
> # yum update
> 
> everything else is updated
> 
> # yum --remove gnome-screensaver
> # yum update
> 
>  xorg-x11-server is now updated
> 
> reboot.... and won't go beyond starting mouse
> console services; X is not launched.
> 
> switch to a TTY:
> 
> # yum downgrade xorg-x11-server
> # reboot
> 
> now working again, with the older xorg-x11-server.
> 
> 
> Machine A *also* had gnome-screensaver
> installed, but it *didn't* kick up a dependancy
> conflict.
> 
> Both machines running SL6.2 x86_64

Same here - I've had 2 machines in the "Machine B" state.

Until I saw this email I hadn't thought to attempt to restart X
but I now find I have to downgrade xorg-x11-server-Xorg for it
to work once more.

-- 
Mark Whidby
Infrastructure Coordinator (Unix)
Physics/Chemistry/EAES/Mathematics Team
IT Services, Faculty of Engineering and Physical Sciences