[Bug 42162] [r600g][kms] Display not enabled on resume (HP DV6)

[bugzilla-daemon at freedesktop.org]

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

--- Comment #19 from Johan Brannlund <freedesktop-bugs at 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.

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