[Bug 297136] FreeBSD loses screen on the X870 Tomahawk motherboard when using the NVidia graphics card

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=297136

Tomoaki AOKI <junchoon@dec.sakura.ne.jp> changed:

           What    |Removed                     |Added
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                 CC|                            |junchoon@dec.sakura.ne.jp

--- Comment #3 from Tomoaki AOKI <junchoon@dec.sakura.ne.jp> ---
If the issue is with screen configurations, and assuming UEFI boots without
CSM,
sc driver shouldn't work, as no physical or emulated text VRAM exists.

If the issue is on screen resolution, loader variables to try would be:

  *efi_max_resolution
  *kern.vt.fb.default_mode

Note that the latter needs screen depth, too, like "1920*1080x32".
Available resolution and depth should be shown in `gop list` on loader command
prompt. Choose one your monitor can handle.

Maybe unlikely, but there can a bit of possibility that cache attribute
for framebuffer matters.
In this case, hw.efifb.cache_attr="uc" possibly help (default: "wc").

Anyway, if you're NOT loading NVIDIA related kmods via /boot/loader.conf,
NVIDIA kmods related issues should happen much later, after devmatch, devd
and devfs starts (means, kernel already kicks /sbin/init) and kld_list
in /etc/rc.conf is started processing.

So early kernel messages should be shown even if kmod are somehow problematic.


If not screen related, what I can think of now are ACPI related
(framebuffer and/or memmapped I/O is mapped to unusual address
outside default address range of ACPI, for example) or vm.pmap related
oddities. But not sure.

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