So, I removed all my PPA, downgraded to the default saucy kernel, added the oibaf PPA, and re-installed the fglrx-updates drivers (also tried the fglrx package). I'm still getting the same problem.
$ uname -a
Linux naught101-chronos 3.11.0-13-generic #20-Ubuntu SMP Wed Oct 23 07:38:26 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux
So, I removed all my PPA, downgraded to the default saucy kernel, added the oibaf PPA, and re-installed the fglrx-updates drivers (also tried the fglrx package). I'm still getting the same problem.
$ uname -a
Linux naught101-chronos 3.11.0-13-generic #20-Ubuntu SMP Wed Oct 23 07:38:26 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux
$ aptitude show fglrx-updates
Package: fglrx-updates
State: installed
Automatically installed: yes
Version: 2:13.101-0ubuntu3
...
$ aptitude show xserver- xorg-video- intel xorg-video- intel 905+git13110709 05.b796c3~ gd~s
Package: xserver-
State: installed
Automatically installed: no
Version: 2:2.99.
...
$ aptitude show xserver- xorg-video- ati xorg-video- ati git20130816. d0323622- 0ubuntu0smartbo yhw
Package: xserver-
State: installed
Automatically installed: no
Version: 1:7.2.99~
...
$ aptitude show libgl1-mesa-glx 908.110009~ gd~s
Package: libgl1-mesa-glx
State: installed
Automatically installed: no
Multi-Arch: same
Version: 10.0~git1311070
...