https://bugs.freedesktop.org/show_bug.cgi?id=42162

--- Comment #19 from Johan Brannlund freedesktop-bugs@nullinfinity.org --- I just tried 3.11-rc3, with the important difference that I kept both cards active when suspending.

When resuming, the backlight now came on for a second but the screen then turned dark again. Looking at the logs, the failure now seems less catastrophic than before.

Could it be that if I disable one card before suspending (using vgaswitcheroo), the resume code unsuccessfully tries to power up the previously disabled card?

Also, I don't seem to get any dpm options in /sys for the discrete card (the 5650), but that's a separate bug I guess.