No kernel messages displayed during boot

Andrei Kolu antik at
Sun Nov 18 11:58:51 PST 2007

Sunday 18 November 2007 21:01:59 kirjutas Dmitry Karasik:
> Hello,
> My 6.2-STABLE crashed today, and when I rebooted it, a very strange effect
> appeared: from the second the kernel took over, immediately after loading
> all .ko files, no text was printed in the console. The system booted
> though, and the next text was printed to the console was the login prompt.
> The screen didn't went blank, just all kernel messages and output of
> /etc/rc* wasn't there -- all was printed on the screen was FreeBSD boot
> menu, and login prompt.
> I've re-run 'make installworld' and 'make installkernel' (as I had
> leftovers from recent buildworld), - didn't help. I've tried to power down
> the machine (suspecied video card trouble), I've resetted BIOS, I've even
> disabled com port in BIOS (because the behavior looks like booting on
> serial console) -- nothing, absolutely nothing changes it.
> When I tried to boot in single-user mode, the prompt was never displayed at
> all, which fact indeed makes me think alogn the path of the wrong boot
> console. I've removed /boot/loader.conf, and double-checked that
> /boot.config isn't present - didn't help.
> My question is therefore, what cause of this effect might be?  Or, if noone
> would be able to answer this, how I would print messages from kernel (I'd
> recompile it for that purpose) to identify which device it picked up for
> console IO -- and especially, how I print that either to a file, or
> directly to /dev/console?

look at /boot/loader.conf
#boot_mute="-m"           # -m: Mute the console to suppress all console input 
and output during the boot.

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