Almost everything.

- The Sony Memory Stick reader never worked.
- The front sound buttons don't work. The mute button works fine though.

- For the VGA output I can't remember exactly, but I had to install some packages and activate the output via the command line. I remembered it was possible but the result wasn't satisfactory (too much hassle and bad quality on-screen).

- I'm not sure about hibernation as I never tested it on it.

- Not sure about the modem.

- Not sure about the Firewire output.

- Note sure about the multimedia buttons.