Comment # 19
on bug 42162
from Johan Brannlund
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.
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