[Bug 111250] i915 external monitor not working in usb-c/thunderbolt dock on X1 gen6

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=111250

--- Comment #19 from tmai at math.upb.de ---
First of all, thanks for the patch and all the explaining. I am learning a few
things here. :-)

I attached 3 new dmesg files. All were created with a fresh drm-tip kernel +
patch.

A brief description of the results:

1. Test with noname-dock booted to console: The Monitor (via hdmi cable) was
connected at a 1024xsomething resolution. Besides the low resolution everything
seemed to work fine. Afterwards I rebooted to gui (kde). Same result, monitor
was connected, but with a low resolution. I could not change the resolution via
the kde settings menu.

2. Test with lenovo-dock booted to console: No change here. Still no connection
to the monitor(s). I tried to monitors with two cables (hdmi and dp). The
hdmi-monitor works fine when connected directly to the notebook. After playing
around a little the system eventually crashed. I had to reboot with a hard
shutdown.

3. Test with lenovo-dock booted to gui (kde): Same thing as with the console:
no monitor worked via the dock. However, I noticed that the hdmi monitor
connected to the laptop directly still showed a screen, when I connected the
other monitor as via dp at the dock. In that scenario the laptop screen itself
went dark, but still showed the mouse cursor.

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