Created attachment 245481 [details]
dmesg with drm.debug=14

Since new install of my Linux System and using a 4.4+ Kernel (before 3.19) I'm getting kernel exceptions every time I disconnect my via HDMI connected Monitor.

Steps:
- booting to desktop without problems
- disconnect HDMI
- eDP is showing desktop for ~2 seconds
- eDP turns black, no keyboard inputs, the rest keeps running

No difference if HDMI connected while/after boot, I tried different 4.4+ Kernel Versions from Ubuntu to Mainline, every time nearly the same output.

[   90.275535] [drm:ironlake_crtc_enable [i915]] *ERROR* mode set failed: pipe A stuck
[   90.329696] ------------[ cut here ]------------
[   90.329789] WARNING: CPU: 3 PID: 1834 at /home/kernel/COD/linux/drivers/gpu/drm/i915/intel_display.c:14221 intel_atomic_commit_tail+0xf93/0xfc0 [i915]

see attached dmesg for the full exception trace.