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?
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You received this bug notification because you are a member of Ubuntu-X,
which is subscribed to xorg-server in Ubuntu.
https://bugs.launchpad.net/bugs/1789913
Title:
X crashes with "randr: falling back to unsynchronized pixmap sharing"
when connecting to an external monitor via HDMI (I+A)
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/1789913/+subscriptions
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