Bug#939401:

[Patrice Duroux]

Hi,

Looking at the following message and the next ones, I was also facing a trouble
and try to find a way to solve it on my system:
https://alioth-lists.debian.net/pipermail/pkg-nvidia-devel/2019-August/017339.html

Just to say that the legacy-390xx driver is not working here. Finally holding 
the version to 418.88-1 using https://snapshot.debian.org/ is fine. ;-)

Thanks,
Patrice