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

["Bryan Zuber via gnats" <gnats-admin%NetBSD.org@localhost>]

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: Thu, 10 Oct 2024 11:57:41 -0500

 I have the latest version of the MrChromebox firmware and have tried a few d=
 ifferent OSes on the device and observed that this issue with failing to boo=
 t sans monitor only seems to occur on NetBSD and FreeBSD, but Alpine Linux a=
 nd Debian have booted with no issues. In the case of FreeBSD, I can get it t=
 o boot headlessly by adding `console=3D"nullconsole"` to loader.conf. Also, I=
  noticed that the i915kms module is not enabled by default in FreeBSD, so th=
 e headless boot problem might be a completely separate issue from the i915dr=
 mkms black screen problem.
 
 > On Oct 10, 2024, at 4:50=E2=80=AFAM, Rin Okuyama via gnats <gnats-admin@ne=
 tbsd.org> wrote:
 >=20
 > =EF=BB=BFThe following reply was made to PR port-amd64/58732; it has been n=
 oted by GNATS.
 >=20
 > From: Rin Okuyama <rokuyama.rk%gmail.com@localhost>
 > To: gnats-bugs%netbsd.org@localhost, port-amd64-maintainer%netbsd.org@localhost,
 > gnats-admin%netbsd.org@localhost, netbsd-bugs%netbsd.org@localhost, bjzuber%icloud.com@localhost
 > Cc:
 > Subject: Re: port-amd64/58732: i915drmkms black screen on boot
 > Date: Thu, 10 Oct 2024 18:46:36 +0900
 >=20
 >> 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.
 >>=20
 >> 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
 >>=20
 >>  Adding `userconf=3Ddisable acpivga*` to /boot.cfg has no effect, the
 >>  device still hangs when booting without a monitor plugged in.
 >>=20
 >>  Here is /var/run/dmesg.boot:
 >=20
 > Thank you for sharing your dmesg. There seems no support
 > for acpivga(4). But,
 >=20
 >>  com0 at acpi0 (COM1, PNP0501-1): io 0x3f8-0x3ff irq 4
 >>  com0: ns16550a, 16-byte FIFO
 >=20
 > this one is nice. I've found an interesting report:
 >=20
 > https://github.com/MrChromebox/firmware/issues/196
 >=20
 > 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.
 >=20
 > They also suggest (1) firmware update, or (2) fake display
 > device for headless operation.
 >=20
 > Thanks,
 > rin
 >=20