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.