Comment 154 for bug 1870736

Update still does not work here, same behaviour as before (200% instead of 125%).

It's not a mobile GPU:

NVIDIA Corporation GK104 [GeForce GTX 680] (rev a1)
NVIDIA Driver Version: 435.21

$ dpkg -l | grep mutter
ii gir1.2-mutter-6:amd64 3.36.3-0ubuntu0.20.04.1.nv2 amd64 GObject introspection data for Mutter
ii libmutter-6-0:amd64 3.36.3-0ubuntu0.20.04.1.nv2 amd64 window manager library from the Mutter window manager
ii mutter 3.36.3-0ubuntu0.20.04.1.nv2 amd64 Example window manager using GNOME's window manager library
ii mutter-common 3.36.3-0ubuntu0.20.04.1.nv2 all shared files for the Mutter window manager

journalctl /usr/bin/gnome-shell -b0 -ef log attached