I can't see anything going wrong in those log files, but that just
supports the theory there is no hotplug event when the HDMI cable is
unplugged.
Still, I would recommend not using the HDMI port at all because it will
force the system to use slow GPU-to-GPU copies for every frame. You will
get better performance if the external monitor is wired to the
integrated GPU, which can often be achieved by using the USB-C port and
an adapter cable. My hope is that will also work around this bug for
you.
** Changed in: mutter (Ubuntu)
Status: Incomplete => New
** Also affects: nvidia-graphics-drivers-535 (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/2138173
Title:
blank screen when external monitor is not connected
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