[Bug 95298] Can't "connect" to external display attached to docking station via DP on laptop with Intel/AMD dual

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=95298

--- Comment #3 from Yaroslav Halchenko <debian at onerussian.com> ---
prev kernel: 4.4.2-3  -- yes it connected/light up no problem.  I had 1 more
issue though (may be relevant).  When I come to work, and drop laptop into
docking station, if then external monitor immediately lights up in 'clone'
mode, I had to turn it off in xrandr/Displays, since otherwise whenever I run
my stock "enable external monitor, disable laptop" xrandr line the whole
display would go black without any signs of life from the laptop and I had to
reboot.  I have forgot if/where I had report on that issue.  If I turned it off
first in Gnome Display and then run xrandr to enable external in Primary mode
-- it worked fine.

runpm: I will try whenever free time emerges (later today/or monday)

bisection: if only nothing left for poor me.  This is the main workhorse
machine for me

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