[Bug 91476] Fedora 23 kernels lock up with Lenovo ThinkPad T440s in monitor connected Ultradock

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=91476

--- Comment #4 from Tom Callaway <tcallawa at redhat.com> ---
Created attachment 118522
  --> https://bugs.freedesktop.org/attachment.cgi?id=118522&action=edit
dmesg log with drm.debug=14 on kernel 4.2.1-300.fc23

This continues to be broken with current kernels. I put the Thinkpad in the
dock, booted up with drm.debug=14. Plymouth (the graphical boot screen in
Fedora) loads up properly on both monitors, but when it drops to the gdm login
screen, it only shows up on the laptop panel (the external monitor is black).
GNOME slowly loads, but when I bring up the display control panel, it seems to
freeze but eventually shows me that it can see the external display, but no
matter what I do, it cannot output to it.

As a reminder, when I undock the laptop and connect the external monitor to the
VGA port, it works as expected.

I had to gz the dmesg log file due to its size, there is a LOT of noise in
there.

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