[Bug 98211] i915 / drm crash when undocking from DP monitors

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=98211

--- Comment #3 from Alejandro Lorenzo <alejandro_aero at yahoo.es> ---
I Also seem to be affected by this. My system is a Dell precision 9550
connected to the Dell TB15 dock station and using DisplayPort

Kernel 4.6 works well, 4.7 hangs when trying to switch a tty if at some past
time the DisplayPort display has been disconnected (That's why it freezes the
system when logging out or powering off; switches to tty)

In my case, the device:

00:02.0 VGA compatible controller: Intel Corporation HD Graphics 530 (rev 06)
(prog-if 00 [VGA controller])
        DeviceName:  Onboard IGD
        Subsystem: Dell HD Graphics 530
        Flags: bus master, fast devsel, latency 0, IRQ 141
        Memory at db000000 (64-bit, non-prefetchable) [size=16M]
        Memory at 70000000 (64-bit, prefetchable) [size=256M]
        I/O ports at f000 [size=64]
        [virtual] Expansion ROM at 000c0000 [disabled] [size=128K]
        Capabilities: <access denied>
        Kernel driver in use: i915
        Kernel modules: i915

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