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Date:      Fri, 7 Apr 2023 11:40:47 +0200
From:      Andreas Kusalananda =?utf-8?B?S8OkaMOkcmk=?= <andreas.kahari@abc.se>
To:        questions@freebsd.org
Subject:   Can not boot without monitor attached
Message-ID:  <ZC_lH8_S835ihvRk@harpo.local>

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Hi,

I'm trying to set up a headless FreeBSD 13.1 system.  I've done so
successfully before on this particular machine, but for whatever reason,
after a complete reinstall, it doesn't want to boot without a monitor
attached via HDMI.  Since it never shows up on the network I'm assuming
it never even gets past the boot prompt.

If I plug in a HDMI cable to a monitor before booting, it boots as
expected.  Plugging in a monitor after unsuccessfully trying to boot
without a monitor does not work (black display).

I tried adding -P to /boot.config, but this had no effect.  The system
is, apart from that, fairly vanilla.

The system is a fan-less Chinese(?) "Basoaro" system with an American
Megatrends BIOS, but I can't find anything in the BIOS that seems
relevant, and since it *used* to be possible to boot the system without
an attached monitor, I'm assuming it's not a BIOS-related issue.

Whatever I did before to get it to boot headless, I've forgotten what it
was and need a reminder and/or pointers from you guys.

Regards,

-- 
Andreas (Kusalananda) Kähäri
SciLifeLab, NBIS, ICM
Uppsala University, Sweden

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