[Bug 99114] [SKL] External VGA monitor not detected after DPMS/second hotplug

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=99114

--- Comment #11 from Imre Deak <imre.deak at intel.com> ---
(In reply to David Woodhouse from comment #10)
> Created attachment 128617 [details]
> script output with only debugging patch
> 
> With only the first (debugging) patch. As expected, the monitor doesn't wake
> up.

Thanks, so the spurious HPD IRQ from the adaptor is gone with patch 3. That IRQ
could've been the marker of the odd state the adaptor was after xset dpms off:
reading the DPCD receiver cap and SINK_COUNT registers work just fine but
reading DP_DOWNSTREAM_PORT_0 regs will result in AUX defers.

Could you provide one more log, with the same setup, the 3 patches applied and
the following script. It'd show if AUX accesses in D3 still cause a problem
with these changes:

dmesg -c
xrandr --verbose
xset dpms force off
dmesg -c
sleep 0.1
xrandr --verbose
dmesg -c
sleep 0.1
xset dpms force on
dmesg -c
xrandr --verbose
dmesg -c

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