[Bug 103643] [Lenovo ThinkPad T450s] System hang with MST dock

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=103643

Johan Thorén <johan.freedesktop at thoren.xyz> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|CLOSED                      |REOPENED
         Resolution|WORKSFORME                  |---

--- Comment #19 from Johan Thorén <johan.freedesktop at thoren.xyz> ---
This error still occurs on kernel 4.20.

My model is T470s and the behavior is consistent: It only happens when
connected to an external display through the dock, not when using it
disconnected from the dock. Can (most of the time) be triggered by changing
display settings through xrandr.

Dock model is SD20F82750.

Dmesg error message:
[drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe B FIFO
underrun

GPU: Intel Corporation Skylake GT2 [HD Graphics 520] (rev 07)

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