USB keyboard and mouse stopped working in X ?

[linuxguy]

On Wed, 2008-09-17 at 22:20 -0400, Chris Tyler wrote:
> On Wed, 2008-09-17 at 20:00 -0600, linuxguy wrote:
> > > PS Some day maybe we'll have an "undo" option for yum :-)
> 
> We do, more or less. Repackage/rollback works with rpm and yum, and a
> quick test shows it works with PackageKit, though it pops up an error
> alert ("The constant 'repackaging' was unknown, please report").
> 
> http://dailypackage.fedorabook.com/index.php?/archives/17-.html
> 
> -Chris

I do not see anything about "rollback" in man yum.  Am I missing
something ?