[Bug 89271] [HSW] i915 doesn't enable DP-2 on MacBook 11,1 (Retina, Intel Only, Late 2013 / Mid 2014)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=89271

--- Comment #23 from Chow Loong Jin <hyperair at gmail.com> ---
Created attachment 134561
  --> https://bugs.freedesktop.org/attachment.cgi?id=134561&action=edit
dmesg without drm.debug=14 and before/after hotplug thunderbolt dumps

I have one eDP-1 and one DP-1. When booted with the monitor plugged in, it
works and both /sys/class/drm/card0-eDP-1/enabled and
/sys/class/drm/card0-DP-1/enabled show "enabled".

After unplugging it and plugging it back in, only
/sys/class/drm/card0-eDP-1/enabled shows up, and it's impossible to bring back
the external display without rebooting.

While examining the thunderbolt dump in dmesg from a booting up event and after
replugging it, I noticed that two DP/HDMI ports are missing in the latter dump:

[   28.716581] thunderbolt 0000:07:00.0:  Port 11: 8086:156d (Revision: 0, TB
Version: 1, Type: DP/HDMI (0xe0101))
[   28.716582] thunderbolt 0000:07:00.0:   Max hop id (in/out): 9/9
[   28.716583] thunderbolt 0000:07:00.0:   Max counters: 2
[   28.716584] thunderbolt 0000:07:00.0:   NFC Credits: 0xf0000b
[   28.716602] thunderbolt 0000:07:00.0:  Port 12: 8086:156d (Revision: 0, TB
Version: 1, Type: DP/HDMI (0xe0101))
[   28.716603] thunderbolt 0000:07:00.0:   Max hop id (in/out): 9/9
[   28.716603] thunderbolt 0000:07:00.0:   Max counters: 2
[   28.716604] thunderbolt 0000:07:00.0:   NFC Credits: 0xf00000

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