handbook: Update the section about Nvidia drivers

[0mp]

Summary

• Recommend to load the driver via rc.conf instead of loader.conf.
• Add a note that some GPUs require nvidia-modeset. Point the reader to the pkg-message for that.

Reported by: Vladimir Mišev

[debdrup]

I think it's better to recommend nvidia-modeset, since it should let Xorg use the modesetting driver that's being used for i915kms, radeonkms, and amdgpu.

Other than that, it looks good to me.

[pauamma_gundo.com]

documentation/content/en/books/handbook/x11/_index.adoc

1242

Since you're adding text just next, perhaps change "will create" to "includes" or "will install"? They're both more accurate since the user wouldn't be compiling from source. (Assuming there is source code and not just an opaque binary biob, that is.)

1257

Saying which versions would be helpful, if that's known.

1258

Also, consistency note: since loader.conf has a manual page as well, I'd use the same markup for it and rc.conf; man: or [.filename]

[iwtcex_gmail.com]

Since this is apparently a somewhat confusing topic, let me clarify a few things:

1. nvidia-modeset.ko is required to be loaded in all drivers that contain it — it's not an optional component;
2. Xorg's "modesetting" driver doesn't work with Nvidia, it expects Mesa-specific kernel interfaces (DRI3);
3. nvidia-modeset.ko alone doesn't enable kernel modesetting, the documentation clearly tells us to set a parameter for nvidia-drm.ko, which is a Linux only kernel module at the moment (not counting an unofficial port).

[0mp]

If anyone wants to pick up this patch, feel free do to so.