I've had some limited success getting it to work.
If you turn the screen off and then on again after starting X, it will work. To do this, you need to turn off ACPI and then press the small button in front of the screen (the one meant for hibernating when the screen is closed).
You will also need the following modeline:
Modeline "1920x1200" 193.156 1920 2048 2256 2592 1200 1201 1203 1242 +HSync +VSync