X fails to init (full freeze), works after some retries

[Torangan]

I changed my system from an older generation to current, saving the old graphics card due to current pricings.
Right now I'm in KDE, everything works smooth.

But after each reboot, X will fail to initialize. System hangs, can't get to virtual console. Enter manual service selection (still using openrc), skip X, search for errors... nothing. After some tries to reboot or to manually start the service, at some point it simply starts. The pattern repeated often enough to be sure, nothing I changed was relevant. It occurs again.

I did find "Failed to initialize the NVIDIA kernel module." in the Xorg.1.log right now. Well, it is running with that exact one...

dmesg contains nothing right now as it is running just fine, if the error occurs I'm fully locked out. Can I check old dmesg out somehow? Or any other hints in which direction I should search?

[NeddySeagoon]

Torangan,

Do not start the display manager at boot. For investigation, remove it from the default runlevel.
Configure your normal users .xinitrc to start the desktop/window manager of your choice in response to startx at the console.

Boot to the console and examine dmesg. If you have video wornings or errors, put all of dmesg onto a pastebiin.
We probably need to fix them anyway. Use wgetpaste, so you don't need a GUI, or save dmesg to a file.

Try startx and make a note of the time of day. If it works, just use it.
If not, regain control and pastebin the Xorg.0.log that has the timestamp you noted above.
Do not start Xorg until the log is posted or saved. That's the log we need.

I suspect that you have a race condition somewhere, so sometimes it works,sometimes not.
I'm not expecting to see anything in the following without the above but you never know.

Put your kernel .config, Xorg.0.log and dmesg onto three pastebins and post the links.
Post the output of

[Torangan]

I did skip display manager installation to examine.

I'll write down those steps and do it tomorrow when I want to restart my PC. Took hours to get in and I want to use it right now.
Race conditions does sound likely, although I did rebuild xorg-server and nvidia-drivers a few times during experimenting.

[Torangan]

Race condition is a good guess. Repeated tries to just power on, power off did get me into X.

dmesg:
https://pastebin.com/5wZykc7r

xorg log after freeze
https://pastebin.com/zMHw49RF

xorg log success
https://pastebin.com/BDuUa2iA

kernel config
https://pastebin.com/Nd2um1UP

lspci

[NeddySeagoon]

Torangan,

I don't see anything related to your Xorg startup issue. I'll think about that.

Your dmesg is truncated. The first 2.3 seconds are lost because the kernel ring buffer is too small. When you reconpile your kernel, fix that. Its an option where your enter a power of 2 for the buffer size.

Your kernel has

[Torangan]

Thanks for those hints, recompiling the kernel now. The new system felt so fast compared to the old one... with brake active...