From: Gilbert Sullivan on
Clean slate, sort of.

I've removed any xorg.conf and am not blacklisting any more.

System docked will not give me a display on the external screen, whether
booted from old kernel or new one.

System undocked works perfectly.

I'm attaching a new dmesg output with the system docked with the new
kernel and the updated xserver-common and xserver-xorg-core. Unless I'm
missing something, it's very much the same story as before. I don't see
where the trouble is. The external monitor and its resolution are
detected. But nothing is displayed on it.

As mentioned before, I filed a bug report. No response to it as of yet.

https://bugs.freedesktop.org/show_bug.cgi?id=28524