[Bug 200531] amdgpu: *ERROR* REG_WAIT timeout when a display is put to sleep

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=200531

--- Comment #4 from Aleksandr Mezin (mezin.alexander at gmail.com) ---
After more testing:
1. "unable to handle kernel NULL pointer dereference" doesn't happen with
4.18-rc5
2. GUI/GPU driver still freezes at some point. Usually I need to leave the
system turned on but with monitors in standby. Only "REG_WAIT timeout" errors
in dmesg.
3. "REG_WAIT timeout" only happens with 2 monitors connected. Dell P2415Q and
LG 27UD69P, both connected through DisplayPort

How to reproduce "REG_WAIT timeout":
1) `xset dpms force off`
2) Wait for both monitors to turn off (backlight should turn off, "no signal"
messages disappear)
3) "REG_WAIT timeout" will happen when you'll press a key/move the mouse - when
the monitors are waking up (I've checked dmesg over SSH from another machine).

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