Look at the inxi output. You're using the nouveau driver.
I was at that time, while my system was still partially broken. Then I reinstalled the Nvidia drivers as per the debian manual - I mentioned that in a later post.
The output of "inxi -r" to show your software sources might also be very enlightening.
You're right, it might be. Especially seeing as I'm sure I installed the Nvidia drivers as per the manual in the first place, and the update where the mess occurred included upgrades to Nvidia packages. So here it is:
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$ inxi -r
Repos: Active apt sources in file: /etc/apt/sources.list
deb http://ftp.uk.debian.org/debian/ stretch main non-free contrib
deb-src http://ftp.uk.debian.org/debian/ stretch main non-free contrib
deb http://security.debian.org/debian-security stretch/updates main contrib non-free
deb-src http://security.debian.org/debian-security stretch/updates main contrib non-free
deb http://ftp.uk.debian.org/debian/ stretch-updates main contrib non-free
deb-src http://ftp.uk.debian.org/debian/ stretch-updates main contrib non-free
deb http://httpredir.debian.org/debian stretch-backports main contrib non-free
Active apt sources in file: /etc/apt/sources.list.d/base.list
deb http://deb.debian.org/debian/ stretch main
Active apt sources in file: /etc/apt/sources.list.d/wire-desktop.list
deb https://wire-app.wire.com/linux/debian stable main
Any evidence that Dr Frankendebian is in the house? (I only installed Wire yesterday, so those two lines at the end were not present when I had the problem.)
FWIW, my current output of inxi -G is:
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$ inxi -G
Graphics: Card: NVIDIA GP107 [GeForce GTX 1050]
Display Server: X.Org 1.19.2 drivers: nvidia (unloaded: modesetting,fbdev,vesa,nouveau)
Resolution: 1920x1080@60.00hz
GLX Renderer: GeForce GTX 1050/PCIe/SSE2
GLX Version: 4.6.0 NVIDIA 390.67
Incidentally, I only have two groups of packages installed from backports: the Nvidia drivers and Audacity.