I have an older PC with NVidia GT 1030 card.  I am running Slackware 15 and Windows on the same machine. Recently installed Devuan 5 64 bit on empty partition and setup multi-boot.

There seems to be a problem with nouveau  driver. System starts and I am getting lightdm prompt. However, resolution is limited to 1024x768. Also, I am unable to switch to virtual consoles (like Alt+Ctrl+F2). There is a blank screen with cursor when I try that. Also noticed that during booting the screen output stops after line "Waiting udevd to be populated".

Blacklisting nouveau solved the problem with consoles and I am now seeing all of the output during boot. However, I am still limited to 1024x768.

So I tried proprietary driver. The problem is that installer can't find kernel source. I installed linux-source and linux-headers- amd64-[version], where [version] was kernel version as reported by uname -r. No dice.

I must say that I am not a Debian man, but rather a Slackware man. I do have some experience maintaining existing Debian server on my previous job, but nothing like hardware or multimedia. Also, far as I can say, non-free repositories are enabled, but NVidia drive does not show.

So, I am trying to get familiar with Devuan. I'd like to know both, if there is a way to fix nouveau and what do I need to compile proprietary driver.  Thanks.