Comment 10 for bug 1767711

What does "status: invalid" mean?

In XFCE > Settings > Additional Drivers > Additional Drivers, it's
currently set to "NVIDIA Corporation GF106M [GeForce GTX 460M] "[x] Using
NVIDIA driver metapackage from nvidia-driver-390 (proprietary, tested)".
Other options are "[ ] Using NVIDIA bindary driver - version 340.106
from nvidia-340 (proprietary)" and "[ ] Using X.Org server - Nouveau
display driver from xserver-xorg-video-nouveau (open source)"

Tried to install nvidia-340, but it cocked up and left the system
in a bad state. I couldn't even revert to nvidia-driver-390 without
doing a lot of "apt --fix-broken install ... dpkg-divert --remove" loops.

Installed the nouveau driver, doesn't send output to the primary display,
had to plug in a second display. (???) used "xfwm4-tweaks-settings"
to make sure Compositing is turned on. Started "totem vapourwave.mp4"
and... no transparency. does_not_reproduce

NVIDIA website says the latest "long lived" (stable?) version is 390.77
(2018-07-16). https://www.nvidia.com/Download/driverResults.aspx/136120/en-us .
It won't let me install it because of the kernel modules already
installed, which I can't remove with modprobe nor rmmod because "resource
is in use" despite no dependencies and I already stopped X.Org. I'll keep trying.

Looking like it's a bad interaction between Totem and the NVIDIA
proprietary driver (nvidia-driver-390). Weird that the other video
players, even the gstreamer-based ones, don't suffer the same problem.