Re: port-amd64/58732: i915drmkms black screen on boot

[Rin Okuyama <rokuyama.rk%gmail.com@localhost>]

On 2024/10/10 0:25, Bryan Zuber via gnats wrote:
> The following reply was made to PR port-amd64/58732; it has been noted by GNATS.
>
> From: Bryan Zuber <bjzuber%icloud.com@localhost>
> To: gnats-bugs%netbsd.org@localhost
> Cc:
> Subject: Re: port-amd64/58732: i915drmkms black screen on boot
> Date: Wed, 9 Oct 2024 10:21:50 -0500
>
>   Adding `userconf=disable acpivga*` to /boot.cfg has no effect, the
>   device still hangs when booting without a monitor plugged in.
>   
>   Here is /var/run/dmesg.boot:

Thank you for sharing your dmesg. There seems no support
for acpivga(4). But,

>   com0 at acpi0 (COM1, PNP0501-1): io 0x3f8-0x3ff irq 4
>   com0: ns16550a, 16-byte FIFO

this one is nice. I've found an interesting report:

https://github.com/MrChromebox/firmware/issues/196

It seems when `Suzy-Q` (aka `CCD`) cable is plugged into
one of the USB ports, it works as USB tty device. Then,
`consdev com0,115200` command to our bootloader enables
serial console. If possible, this would be really helpful
for debugging.

They also suggest (1) firmware update, or (2) fake display
device for headless operation.

Thanks,
rin