The crux of the problem is an API mismatch between the kernel module and
the nvidia driver. The problem arises in the normal course of applying
updates and not from user tinkering (see #1).
$ uname -a
Linux OptiPlex-380 5.4.0-47-generic #51-Ubuntu SMP Fri Sep 4 19:50:52 UTC 2020
x86_64 x86_64 x86_64 GNU/Linux
$ journalctl -b -k | grep -m 1 -A 3 "API mismatch"
Dec 11 21:07:00 OptiPlex-380 kernel: NVRM: API mismatch: the client has the
version
455.38, but
NVRM: this kernel module has the version
440.100.
Please
NVRM: make sure that this kernel module
and all
NVIDIA driver
NVRM: components have the same version.
$ apt-cache depends linux-modules-nvidia-455-generic
linux-modules-nvidia-455-generic
Depends: linux-modules-nvidia-455-5.4.0-54-generic
Depends: nvidia-kernel-common-455
Depends: nvidia-kernel-common-455
There's no nvidia kernel module for 455 and 5.4.0-47 and hence the
broken system. Boot 5.4.0-54 and everything works. Upgrade[boot]
5.4.0-57 and the system breaks again.
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https://bugs.launchpad.net/bugs/1900584
Title:
Regression: suspend/wake-up no longer working properly
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