I have a Dell XPS 15 laptop with an external display through the mini-displayport, and I am completely unable to get the suspend functionality working correctly with Ubuntu 13.04 Raring Ringtail.
With any of the 3.8 kernels, suspending the computer seems to work correctly for about a half second, and then the fan starts up to full blast, and the activity light stays on (instead of the slow blink that indicates sleep mode).
With 3.9, I can initiate suspend correctly, but the laptop only displays a blank screen upon resume.
The 3.10 kernel suspends and resumes correctly except for the mini-displayport crashing. My external monitor goes into power saving mode after the computer wakes up from suspend and stays that way until I restart the computer, even after restarting lightdm.
3.11 encounters other errors when resuming.
This is getting extremely frustrating. Any help or insight would be much appreciated. Thanks!