[Bug 106250] Regression with Dell TB16 dock and Linux kernel 4.16.x

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=106250

--- Comment #12 from Stanislav Lisovskiy <stanislav.lisovskiy at intel.com> ---
I've discovered one more "funny" issue, which probably Patrik was also facing:
each second time, when Thunderbolt is disconnected and then connected back, the
external display doesn't work.
I've checked with logs + added own traces - seems that kernel(4.18-rc7) sends
hotplug event as it should, however each second time, we don't get
drm_mode_setcrtc for PIPE_B from userspace. To me it looks like a userspace
issue, as kernel seems to reach properly. 
I've attached the corresponding logs (not_working_pipe_b - for not working case
and working_pipe_b - for working case).
It changes for each second time mostly, which indicates some logic problem and
the only difference is that we simply don't get drm_mode_setcrtc for pipe B
despite that hotplug was sent through sysfs, which was verified by additional
traces(see the logs).

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