[gentoo-user] AMDGPU: computer won't shut down

[n952162]

I posted about this problem perhaps a year ago - when running with
AMDGPU, my system won't turn off, I have to hold the power button down
for a long time, forcing it down.

At that time, various people commented. but AMDGPU didn't work at all
for me in the end, didn't talk to my HDMI display.

I gave up on it.

Thanks to all the great help here, I finally got my system properly
updated and AMDGPU working, and it  finally talks to my HDMI display. 
But, it still doesn't shut down.

Is it a bug?  Is my system still not right?  Is there something I have
to do yet?