[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 #22 from Stanislav Lisovskiy <stanislav.lisovskiy at intel.com> ---
I've located a problem. It was in xserver/ddx code, at some point thinking crtc
hasn't changed, while it did. I've made some raw patch for xserver and it works
for me, but I haven't sent it yet, because basically it just removes part of
crtc checking code, which prevents drm_mode_setcrtc ioctl to be done.

As a temporary workaround you can try xrandr --output (your not working output
name) --crtc (some number here) - this will force drm_mode_setcrtc call to be
made and the screen will be back.
I can also post my temporary fix here, however it requires rebuilding xserver
from scratch and then installing it.

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