From nvidia forum: "Linux Kernel 5.9+ is incompatible with current and previous NVIDIA Linux GPU drivers.".
Yes, this is true. I am using one of older NVIDIA GPUs. The driver for it is in the 390xx version. After today's kernel upgrade to 5.9 my graphical environment didn't start. So I had do revert linux and linu-headers to the latest 5.8.14.If there is any help before the mid of November, please be so kind and give us a hint.
For sure I can wait a month or so without current upgrades, as my environment is completed and I don't preview any urgent need of installing additional apps...
What's worse, 390xx drivers are in AUR and they have been abandoned...