[Bug 291232] x11/nvidia-kmod: On recent CURRENT black screen, problem rebooting

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=291232

            Bug ID: 291232
           Summary: x11/nvidia-kmod: On recent CURRENT black screen,
                    problem rebooting
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: Individual Port(s)
          Assignee: x11@FreeBSD.org
          Reporter: ohartmann@walstatt.org
          Assignee: x11@FreeBSD.org
             Flags: maintainer-feedback?(x11@FreeBSD.org)

On recent CURRENT (FreeBSD 16.0-CURRENT #14 master-n282165-718acd74657f: Wed
Nov 26 08:26:23 CET 2025 amd64) with a recent nvidia 5060Ti GPU, port 
x11/nvidia-kmod (nvidia-kmod-580.105.08.1600004) fails to present xdm/GUI. The
x11/nvidia-kmod, x11/nvidia-driver ports are recompiled every time world/kernel
is build.

xdm is setup via /etc/ttys (ttyv9   "/usr/local/bin/xdm -nodaemon"  xterm  
onifexists      insecure).

Since a couple of days for now, it seems that with recent nvidia kernel module
loaded, a reboot (either reboot or shutdown -r now) takes a long time until an
error occurs ("... some processes would not die, ... adviced"). It is not
possible to interrupt or watch which process rejects to perish, but I guess it
is xdm.

Without nvidia kernel module loaded, FreeBSD behaves in most cases as expected
and performs a clean reboot or even working without GUI is possible so far.

I use a custom kernel! Custom kernel worked before, I guess, commit
9562994a7aacee2baae6ddee1a7b558b48ae39ef - this commit is a marker to me, I
rebuilt kernel yesterday before this commit has been made and it worked so far
even with GUI. After that commit, I had to follow now vanished UPDATING remarks
about setting some sysctl flags (see my PR 291212 on that).

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