This looks like the bug:
六 16 16:27:00 ubuntu-XPS-13-9310 gnome-shell[1880]: KMS: Swap buffers: 2
frames pending (triple-buffering)
(one new frame is rendered while the previous one hasn't finished yet.
This is normal.)
六 16 16:27:00 ubuntu-XPS-13-9310 gnome-shell[1880]:
meta_window_set_stack_position_no_sync: assertion 'window->stack_position >= 0'
failed
(don't know if this is related but other people have reported bugs when
this message occurs)
六 16 16:27:00 ubuntu-XPS-13-9310 gnome-shell[1880]: KMS: [atomic] Page flip
callback for CRTC (167, /dev/dri/card0), data: 0x559afbe6f410
六 16 16:27:00 ubuntu-XPS-13-9310 gnome-shell[1880]: KMS: [atomic] Page flip
callback for CRTC (98, /dev/dri/card0), data: 0x559af83bad60
(both monitors completed their oldest frames and *should* be told to start
the most recent frame now. Instead nothing happens for 21 seconds.)
六 16 16:27:21 ubuntu-XPS-13-9310 gnome-shell[1880]: KMS: Updating device
state for /dev/dri/card0
(everything wakes up - the external monitor is removed)
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https://bugs.launchpad.net/bugs/1976204
Title:
Screen freeze
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