[Bug 211649] "drm/amd/display: reuse current context instead of recreating one" cause hdmi hotplug blackscreen on amdgpu

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=211649

--- Comment #7 from Nicholas Kazlauskas (nicholas.kazlauskas at amd.com) ---
That makes more sense then, that's the behavior I'd expect on CrOS/Android.

Also explains why we haven't seen this on X/Wayland based compositors like
GNOME on Ubuntu.

One more log I'd like captured here, the trace log. Please record a log from
before the black screen occurs until after.

I've included a snippet below that shows how to capture this log:

#!/bin/bash

set +x
OUTPUT_DIR=$(pwd)

mount -o remount,rw /
echo 4 > /sys/module/drm/parameters/debug
echo 65536 > /sys/kernel/debug/tracing/buffer_size_kb

cd /sys/kernel/debug/tracing/
echo amdgpu_dm* > set_ftrace_filter
echo function > current_tracer
echo 1 > events/amdgpu_dm/enable
echo 1 > tracing_on
echo > trace
echo "Capturing a trace...\n"
read -n 1
cat trace > $OUTPUT_DIR/trace.txt
echo "Saved trace to ${OUTPUT_DIR}/trace.txt"
dmesg > $OUTPUT_DIR/dmesg.txt
echo "Saved dmesg to ${OUTPUT_DIR}/dmesg.txt"

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