On Fri, Jul 13, 2012 at 1:47 PM, Pat Riehecky <[log in to unmask]> wrote:
> 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

Unfortunately not!

Now that I've looked into it, xorg-x11-drv-evdev-2.6.0-2.el6
was actually one of the 47 updates that were installed onto
the SL6.0 machine that resulted in a flickering monitor and
failure to load KDE.