Same problem on an HP Pavilion dm1 with ATI Radeon using open source drivers.
Occured after upgrade to 12.10.
Screen is purple while booting, flickering a few times. Log-in sound plays, but
screen remains purple.
Cannot Ctrl-Alt-F1 to terminal.
One interesting point - if AC adapter is connected
I'm using Precise on a HP Pavilion dm1 laptop.
After suspending by closing the lid then resuming by opening the lid, the
(unlocked) screen is visible for 1-2 seconds before locking.
After suspending due to inactivity, the lock screen is displayed immediately
upon resume.
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