Comment 31 for bug 133677

I've collected the reports about failures during mode switching (e.g. suspend/resume), such as bugs 138256 and 150109:

https://wiki.ubuntu.com/X/Bugs/ScreenModeChange

I'd encourage anyone with Intel graphics having problems with blank, black, or frozen screens after resume from suspend, hibernate, tty switch, and so on, to add data to that page, so we can get a more complete feel for what the bugs are.

I've also created a page summarizing how to analyze and work around these issues. It would be worthwhile for anyone experiencing these issues to review and try these steps, and then report their findings on the appropriate bug

https://wiki.ubuntu.com/X/Debugging#head-0b6e9c6b60fa07cda4013a1c51239f1c14c4f89d