[Bug 83331] radeon: Laptop panel out of sync after dpms standby/suspend/off

[bugzilla-daemon@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=83331

--- Comment #7 from Klaus Kusche <klaus.kusche@computerix.info> ---
1.) The behaviour is absolutely reproducible: 
I *always* get almost exactly the same delays
(both during boot and during internal display output off / on), 
I *always* get exactly the same messages,
and I *always* get a non-functional internal display with strange patterns
after dpms standby/suspend/off (external displays are fine).

The only random thing is that during boot the internal display
sometimes is cleanly black for 5 seconds on the VGA->fbcon switch,
and sometimes shows some white flashes at the beginning of this 5 second
period.

2.) Internal display output off / on does not produce any kernel messages,
the delay happens silently.

3.) I'll attach a kernel boot log with printk timings:
Radeon, drm and fbcon init start at 2.35 and end at 7.77
(which is 60 % of the whole kernel boot time)
* There is a 0.5 sec delay before the ring tests.
* ... and a 1.5 sec delay before "fb mappable"
* ... and a 3.0 sec delay before switching to fbcon

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