[Bug 291232] x11/nvidia-kmod: On recent CURRENT black screen, problem rebooting (process (probably xdm) not dying)

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

--- Comment #5 from Tomoaki AOKI <junchoon@dec.sakura.ne.jp> ---
(In reply to O. Hartmann from comment #3)
Not limited with nvidia, unloading kernel mode setting GPU drivers (included
non-generic nvidia-modesetting.ko) usually causes crash or hang, as kernel /
console driver no lonnger know how to set modes properly.

On ancient GPU drivers (recently called User Mode Setting driver in contrast
with KMS), kernel / console driver didn't matter about mode settings (UMS drove
/ release video buffer by itself). Vanilla kernel/console drivers run as if
nothing changed, IIUC.

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