> I have noticed this behaviour on at least one machine.
> If I shutdown the machine with apm power off, the filesystem is dirty and
> has to been checked on the next reboot. It seems, the power is cut too fast.
> I don't have any problems with reboots.
> It seems the drive doesn't have the time to write the superblock back to disk.
> 
> I simply put a DELAY(4000000) in the apm_power_off() routine and the problem
> fades away.
> Any thoughts on doing this a configurable option? It doesn't break anything,
> it only takes a few seconds longer for the machine to power off.
> 
> The drive is a Maxtor Diamond Max (90432D2) 4GB IDE drive in an Asus SP98
> board.

Ok, simple programming project for you.

Find a suitable location, and add a SYSCTL node (eg.
kern.shutdown.poweroff_delay) and SYSINIT to register an at_shutdown
function that delays that long just before the power-off routines are
called.  Test it, file a PR and gimme the PR number.

-- 
\\  Sometimes you're ahead,       \\  Mike Smith
\\  sometimes you're behind.      \\  m...@smith.net.au
\\  The race is long, and in the  \\  msm...@freebsd.org
\\  end it's only with yourself.  \\  msm...@cdrom.com



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