Comment 16 for bug 1789913

At the risk of posting this in the wrong place ... I encountered a crash just like this today and I believe it's the same thing. I've got a Dell Precision 7530 with a discrete AMD card in bypass/direct mode (the Intel graphics are bypassed).

1. Like the original report, I connected a display to the HDMI output of the laptop
2. I waited several seconds and the external display was not automatically enabled
3. I pressed Win-P to get to the display quick change dialog
4. X crashes to a login screen

It's not clear whether the crash was in progress before or after I pressed Win-P. The symptom seems to be the same. The X log shows a bunch of EDID data being read from the HDMI device, then "randr: falling back to unsynchronized pixmap sharing", which is the last message in the crashed X log.

Packages on this machine:

xserver-common: 2:1.19.6-1ubuntu4.2
xserver-xorg-video-amdgpu-hwe-18.04: 18.1.0-1~18.04.1

Are there any additional data collection steps I can take to confirm that this is the same error or help debug it?