I found several post, articles about preventing Nvidia splash during boot.
Does anyone know the correct option & "on" indicator to use?

I can say ONE of the "Enabled" type values (i.e., "1") is WRONG!
Caused bit of lost time, as it wouldn't launch Mint w/ the "1" in place. Instructions on editing (root) files from tty using editor were plentiful. Several didn't work in Mint 20's tty. I've edited files from terminal before (before Mint starts), but not from tty & not in LM 20.1.

Unless you're a pro, if forced to edit from cli before Mint loads, I suggest using Nano, which has many options at bottom of screen. To save changes, use "write out" option (^O).
Supposedly, if in /etc/X11/xorg.conf, in the Section "Device", if you add:
it stops the splash. Not here. Found other posts / tips, that values like "On" or "1" had to be added after the "NoLogo" value.

I know for sure that "1" is incorrect & not using some "enabled" indicator didn't stop the splash.

What does cat /proc/cmdline report?

Is Plymouth installed?

Do by "Nvidia" you mean your GPU, or the installed kernel and/or display driver(s)?

EDIT 2021-Nov-11: Re: never mind
So Nvidia's Readme file says it should be "true / false", but don't say if the 1st letter should be upper / lower case, or either.

Thanks mrmazda,
Yes.
Yes, no, and yes. Nvidia GPU; Nvidia proprietary drivers v340.108 (recommended by LM Driver Mgr).
Nvidia installed a pretty extensive settings UI, but no setting for "Show / Don't Show Splash", as some software, hardware have.

The question is fairly simple, but there are diff answers (even sites like https://wiki.archlinux.org/ - on what key should be used to show the Option "NoLogo" is enabled or disabled. As said, using NO value let the splash screen continue, every 4th or 7th?? boot. Using "1" (as one site suggested), stopped it from booting into Mint at all. Took a while to find why boot was failing; - because " '1' isn't a valid entry for... Nvidia option..."

The splash doesn't appear every boot, or each new day, but displays for several sec., when it does.

Without adding the option to xorg.conf to stop Nvidia's splash, the boot process is fine. If no one here knows the answer off top of their head, I'll try contacting Nvidia or EVGA.

Try disabling Plymouth. It's capable of being interfered with by NVidia's drivers. I never allow Plymouth to remain installed, so don't recall on Mint which of these works or not to disable it when appended to the linu line in Grub:

• noplymouth
• plymouth=0
• plymouth.enable=0