[Bug 199621] iMac 2009, Mobility Radeon HD 4670: black screen on boot

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=199621

--- Comment #9 from Matthew Trescott (matthewtrescott at gmail.com) ---
There is something else strange here. Even if I run the command I mentioned
above, xrandr --verbose always says that output eDP-1 is using CRTC 0. It never
changes, even though the screen turns on and off. I suppose the X server uses
some magic ioctl calls or something that fixes it when it tries to switch to
CRTC 1.

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