On 07/12/2012 04:06 PM, David Crick wrote:
> On Thu, Jul 12, 2012 at 6:47 PM, zxq9<[log in to unmask]>  wrote:
>> On 07/11/2012 08:03 PM, Dr Andrew C Aitchison wrote:
>> Just helped a guy out in the slforum IRC yesterday with this same problem on
>> SL 6.1 (nVidia graphics on his system -- the graphics drivers aren't the
>> issue). The resolution was a downgrade.
> I just pulled the latest set of updates with all the drivers on my Machine B.
>
> Rebooted and once trying to start X the KDE loading screen just flickered and
> flickered (as in the actual MONITOR was flickering on and off).  When I returned
> to it later it had bombed out back to the login screen.
>
> Tried yum --downgrading the xserver, but wasn't having it.
>
> Tried yum --downgrading ALL the 47 just-installed updated packages but
> it complained that only upgrading was allowed.
>
> Had to manually download each of the 47 base OS rpms (thank goodness
> for tab-complete in lftp!) and then do an rpm -ivh --force --nodeps *.rpm
>
> Rebooting and now working off the original OS packages.  (Indicentally, I
> discovered this problematic Machine B is actually running SL6.0, whereas the
> OK Machine A was on 6.2)
>
>
>> The specific problem in the xorg log was that the evdev input module
>> couldn't load because of a version mismatch. There may be other mismatches,
>> but that was the point xorg gave up.
>>
>> Whenever the graphics drivers load first GDM will display but no input is
>> possible, if the graphics is scheduled after evdev then x won't give you a
>> graphical indication that anything is moving.
>
> Pat, does the evdev bit above give you a clue as what else might need
> to be recompiled/updated?
>
>
>     David.

An updated evdev was posted yesterday, that should resolve it.  You may 
need to do a 'yum clean all' to get the updated metadata.

Let me know.

Pat

-- 
Pat Riehecky
Scientific Linux Developer