Compositing disabled, "solutions" found don't work

Hi,

I'm installing netflix-desktop on a clean install of Ubuntu 12.04. I've followed these instructions:

sudo apt-add-repository ppa:ehoover/compholio
sudo apt-get update
sudo apt-get install netflix-desktop

but when I go to start the app, I get the "Compositing is not available, please enable compositing support and relaunch Netflix Desktop" notification. I'm not using an experimental driver. Running rm -Rf ~/.wine-browser and ~/.netflix-desktop and restarting netflix-desktop doesn't change anything. Running netflix-desktop --showdebug results in

X Error of failed request: BadRequest (invalid request code or no such operation)
  Major opcode of failed request: 153 (GLX)
  Minor opcode of failed request: 19 (X_GLXQueryServerString)
  Serial number of failed request: 12
  Current serial number in output stream: 12
X Error of failed request: BadRequest (invalid request code or no such operation)
  Major opcode of failed request: 153 (GLX)
  Minor opcode of failed request: 19 (X_GLXQueryServerString)
  Serial number of failed request: 12
  Current serial number in output stream: 12

My drivers are

00:02.0 VGA compatible controller: Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller (rev 09)
01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Whistler [Radeon HD 6730M/6770M/7690M XT]

Any help you can give would be welcome. Thanks!