[Bug 93578] Intel HD 520 failed to train DP when connected with a external monitor

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=93578

--- Comment #57 from sonny at fastmail.net ---
In case it's helping I'm getting

[  120.800144] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU
pipe A FIFO underrun
‎[   28.659223] [drm:intel_dp_link_training_clock_recovery [i915]] *ERROR*
failed to enable link training
[   28.929015] [drm:intel_dp_start_link_train [i915]] *ERROR* failed to start
channel equalization

and a bunch of

[  120.183252] WARNING: CPU: 0 PID: 795 at drivers/gpu/drm/i915/intel_pm.c:3675
skl_update_other_pipe_wm+0x177/0x180 [i915]

with laptop screen flickers when I connect an external HDMI screen to my Dell
DA200 adapter connected to an XPS 13 Skylake.

4.7.6-1-ARCH

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