[Bug 82153] [HSW DP MST] External monitors connected via Lenovo Ultra Dock turn off when logging into X

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=82153

--- Comment #10 from Chris Wilson <chris at chris-wilson.co.uk> ---
Ok, that is conclusively the DE that rearranges the monitor in several steps. I
was worried that the hotplug event was triggering extraneous steps... However,
in this case there was not a hotplug event during startup and we did not go
through a stage with both external outputs disabled. So this is not quite the
same sequence as earlier. Could you please try a few more times and look for an
Xorg.0.log with

"removing GPU device /sys/devices/pci0000:00/0000:00:02.0/drm/card0/card0-DP-5
(null)"

and/or

"resizing framebuffer to 1920x1080"

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