From Newsgroup: alt.os.linux.gentoo

I have a GigaByte GeForce Nvidia RTX 5090 OC (elsewhere older Nvidias)
which only output to either of two small monitors I booted with, not the
other, nor 4K, nor did startx. Unlike other operating systems (OS) I'm
used to (or popular extra/quasi-official repository) I don't see (from
'emerge --search nvidia') a plain framebuffer driver for being able to use three monitors (though they will duplicate in the intersect set) and do graphics not GUI or also after exit (I boot to command-line). I saw a forums.gentoo.org Nvidia X Window System (X) thread but original poster
already knew most, so what was still said was harder to understand without
the complete picture in one section, and is only 1/3 my issue (other being
CUDA but I saw its package so probably works). How would I go about
getting a binary package, or recompiling one, first for non-GUI
framebuffer, and then for X?
rUfrUfrUfrUfrUfrUfrUfrUfI found your wiki:nvidia-drivers and some more helpful (though partly
outdated/confusing) old threads (none had framebuffer and Nvidia in
title). I'll take a look at those... even for a Slackware user, the amount
of reading and detailed possible configuration of kernel and drivers is slightly daunting so any replies would still be good.

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From Newsgroup: alt.os.linux.gentoo

On 2025-12-15 22:09, David Chmelik wrote:

I have a GigaByte GeForce Nvidia RTX 5090 OC (elsewhere older Nvidias)
which only output to either of two small monitors I booted with, not the other, nor 4K, nor did startx. Unlike other operating systems (OS) I'm
used to (or popular extra/quasi-official repository) I don't see (from 'emerge --search nvidia') a plain framebuffer driver for being able to use three monitors (though they will duplicate in the intersect set) and do graphics not GUI or also after exit (I boot to command-line). I saw a forums.gentoo.org Nvidia X Window System (X) thread but original poster already knew most, so what was still said was harder to understand without the complete picture in one section, and is only 1/3 my issue (other being CUDA but I saw its package so probably works). How would I go about
getting a binary package, or recompiling one, first for non-GUI
framebuffer, and then for X?
rUfrUfrUfrUfrUfrUfrUfrUfI found your wiki:nvidia-drivers and some more helpful (though partly
outdated/confusing) old threads (none had framebuffer and Nvidia in
title). I'll take a look at those... even for a Slackware user, the amount
of reading and detailed possible configuration of kernel and drivers is slightly daunting so any replies would still be good.

OP, I must ask, a year (secretly three months) larer, did you find an
answer?
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From Newsgroup: alt.os.linux.gentoo

On 09/03/2026 09.06, casie wrote:

On 2025-12-15 22:09, David Chmelik wrote:

rUfrUfrUfrUfrUfrUfrUfrUfI found your wiki:nvidia-drivers and some more helpful (though
partly
outdated/confusing) old threads (none had framebuffer and Nvidia in
title). I'll take a look at those... even for a Slackware user, the
amount
of reading and detailed possible configuration of kernel and drivers is
slightly daunting so any replies would still be good.

OP, I must ask, a year (secretly three months) larer, did you find an answer?

If you install the binary drivers for nVidia: emerge nvidia-drivers
update your initramfs
blacklist novou driver
reboot and then run: cat /sys/module/nvidia_drm/parameters/fbdev

If you get Y then you have the nvidia fbdev up and running.
If you get N then you may need to modify your nvidia_drm options and
enable fbdev

After that I guess you can play with kernel options as these below nvidia_drm.modeset=1
nvidia_drm.fbdev=1
video=DP-1:2560x1440@60
video=DVI-D-1:3840x2160@60
nvidia_drm.modeset=1 video=DVI-D-1:2560x1440@60,3840x2160 video=DP-1:3840x2160@60 video=DVI-D-1:3840x2160@60e fbcon=map:0

All this with just a few minutes with duckduckgo
Wish you good luck

For X11 stuff, it should more or less just be enough to install the
driver, it's a while since I had a desktop Gentoo, all those I still
have are headless. Wayland still has some kernel tweaking required like
the modeset has to be enabled, still not got that to work on my Desktop,
works fine on my laptop, but that one uses intel graphics.
--
//Aho
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