[Bug 287453] x11/nvidia-driver: Vulkan and OpenGL are broken on RTX 5000 series

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=287453

--- Comment #8 from Tomoaki AOKI <junchoon@dec.sakura.ne.jp> ---
(In reply to mfoacs from comment #7)
Unfortunately, what's currently clear for us is that GSP related codes has some
problems, but not all of them are clear as samples are limited and reported
problems are not the same (different failure modes, i.e., unable to
suspend/resume if GSP firmware is loaded, cannot start xorg unless GPS firmware
is loaded, problems on quite large [larger than 4k]).

And what can be done on ports side are limited. If the issues are in
closed-source part and nothing which can toggle something affecting the issue
are exposed to open source parts, we can nothing to do. Currently
known-to-affect issues are already cared and documented on latest main branch
of ports tree.

Something that can affect but not yet known could be fount with
  `sysctl -a | fgrep hw.nvidia`
and their descriptions can be read with
  `sysctl -ad | fgrep hw.nvidia`.

With
  `sysctl -aW | fgrep hw.nvidia`
you can see sysctls that can be set at runtime (not limited with boottime).

Beware! Some of them could be dangerous unless you clearly understand what
you're going to do.

Note that description of hw.nvidiadrm.fbdev is wrong (matches with
hw.nvidiadrm.modeset), which we already reported.

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