I've disabled all extensions and recorded a video. Here's the output of
lspci:
$ lspci -k
00:00.0 Host bridge: Intel Corporation Skylake Host Bridge/DRAM Registers (rev
08)
Subsystem: Lenovo Xeon E3-1200 v5/E3-1500 v5/6th Gen Core Processor
Host Bridge/DRAM Registers
Kernel drive
[Expired for gnome-shell (Ubuntu) because there has been no activity for
60 days.]
** Changed in: gnome-shell (Ubuntu)
Status: Incomplete => Expired
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This is really easy to reproduce. Just arrange your screens so your
external screen is above the internal one instead of to the left or
right. Now when you switch virtual desktops the contents are moved
through the external screen.
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1. Please try removing all your extensions and see if the problem goes
away:
b'org.gnome.shell' b'enabled-extensions' b"['pixel-sa...@deadalnix.me',
'system_moni...@bghome.gmail.com', 'removeaccesibility@lomegor', 'sound-
output-device-choo...@kgshank.net', 'alternate-tab@gnome-shell-
extensions.g
