Comment 3 for bug 808677

Similar issue occurs for me on an up to date Oneiric x86_64 install on a Dell Latitude E6400 but after connecting an external monitor the laptop screen goes completely back and the external monitor goes into standby after reporting no signal. Trying to switch to a virtual terminal does not reactivate the laptop screen, all I can do is hit the power button to reboot.

Attaching lspci output, let me know what else I can provide to help track down the cause.