Created attachment 293765 [details]
two stack traces

Hello,
I own:
- AMD Ryzen 3 PRO 4350G with Radeon Graphics (I'm using integrated GPU)
- TV connected via HDMI
- monitor connected via DisplayPort

No daisy chaining is used.

I'm using amdgpu module with Xorg modesetting driver (but issue happens on ati and amdgpu too).

During the evening I tend to disable my displayport monitor output and enable HDMI output to TV to watch some movie. After watching the movie I want to re-enable monitor output and this is where the trouble begins.

Usually I'm using xfce4-display-settings but
`xrandr --output DP-2 --auto --primary`
causes the same issue.

The issue is that the monitor (often, not always) stays black. And picture on TV freezes (often, not always). Sometimes I'm able to restore system functionality via SysRq and switching to different TTY, sometimes I need a hard reset.

I was able to get some stack traces when this happens (from journactl). In the attachment you will find two. During the second one I used xrandr command to switch. Music that was playing started to loop every 0.5 second, screen got bright blue and it lasted for few seconds. Then everything got back to normal except of the fact that there were small green squares following my cursor.

The interesting fact is that when I run xrandr, my displayport outputs get often (not always) changed. So if the monitor was DP-2, it becomes DP-3.

xorg-server: 1.20.9.r21.g5c400cae1-2
kernel: 5.9.9-arch1-1 64 bit
distro: Archlinux
mesa: 20.2.2-2
xrandr 1.5.1