There's no automatic way to revert to an earlier version of the PPA as a
whole, but you can revert packages individually by manually installing
the older .deb files. And since only the -intel package has been updated
lately, that's the only one you'll have to revert.

To install a .deb file manually, type
sudo dpkg -i <filename>

The file you want might still be in /var/cache/apt/archives. If not, here is 
the archive of past versions:
https://launchpad.net/~brian-rogers/+archive/graphics-testing/+packages?field.name_filter=&field.status_filter=&field.series_filter=karmic

It's good to save the files (or copy them out of /var/cache/apt/archives
where they might be deleted automatically) ahead of time in case X won't
boot with the new version. That way you'll already have the old package
and can install it from the recovery console.

Also, to revert the PPA entirely and go back to Karmic, install ppa-purge and 
run this command:
sudo ppa-purge ppa:brian-rogers/graphics-testing

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[i845G] Karmic stops responding a few minutes after log in
https://bugs.launchpad.net/bugs/456902
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