I can confirm that linux-image 4.7.0-994-generic_4.7.0-994.201607052202
from http://kernel.ubuntu.com/~kernel-ppa/mainline/drm-intel-
nightly/2016-07-06/ behaves much better.

DP hotplug/unplug behaves correctly across text console, VT switch to
lightdm and login into Unity. There's still some WARNs in dmesg
(attached) when connecting the external DP monitor, but nothing crashes,
and my 4k desktop appears to function correctly:

   [drm:skl_set_cdclk [i915]] *ERROR* failed to inform PCU about cdclk
change

    WARNING: CPU: 1 PID: 929 at 
/home/kernel/COD/linux/drivers/gpu/drm/drm_irq.c:1218 
drm_wait_one_vblank+0x16f/0x1b0 [drm]
    vblank not available on crtc 0, ret=-22

    [drm:gen8_irq_handler [i915]] *ERROR* CPU pipe B FIFO underrun

Confirmed to still crash with http://kernel.ubuntu.com/~kernel-
ppa/mainline/v4.7-rc6-yakkety/

** Attachment added: "Linux version 4.7.0-994-generic (kernel@tangerine) (gcc 
version 5.4.0 20160609 (Ubuntu 5.4.0-6ubuntu1) ) #201607052202 SMP Wed Jul 6 
02:04:37 UTC 2016"
   
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1597267/+attachment/4696230/+files/ubuntu1604-linux47drm994-dp.dmesg

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https://bugs.launchpad.net/bugs/1597267

Title:
  ThinkPad X260 connecting external DisplayPort hangs system

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