[Bug 98912] New: [SKL] ext. HDMI hotplug not working on i7-6700HQ laptop

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=98912

            Bug ID: 98912
           Summary: [SKL] ext. HDMI hotplug not working on i7-6700HQ
                    laptop
           Product: DRI
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: raptorteak at gmail.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 128283
  --> https://bugs.freedesktop.org/attachment.cgi?id=128283&action=edit
dmesg

Laptop : Inspiron 15 Gaming 7566
Distro : Xubuntu 16.04
CPU : Intel i7-6700HQ + HD 530
Additional GPU : Nvidia GeForce GTX 960M

What happens : The only way to have an external monitor recognized via HDMI is
to have it plugged at boot. Attempting to hotplug an HDMI monitor later on
always fails.

Reproduce rate : every time. Tested on kernels 4.4 and 4.9-rc6.

dmesg note : Kernel 4.9-rc6, without nouveau. The PC boots with the HDMI
monitor plugged in (working), and at ~70s I unplug/replug it (not working
anymore).

xrandr note : xrandr --verbose while the monitor was still plugged in and
functional. Hotplugging results in only eDP1 being recognized.

Additional notes : Tried with and without nouveau. Both result in the same
behaviour.

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