From owner-freebsd-acpi@FreeBSD.ORG  Sat May 26 17:14:55 2007
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Date: Sat, 26 May 2007 13:14:52 -0400
From: "Andrey Shuvikov" <mr.hyro@gmail.com>
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References: <24393ae80705172026u6194f11esc525d52470aa71f9@mail.gmail.com>
	<200705251225.24467.jhb@freebsd.org>
	<24393ae80705250951x3799c9a4t69df6f94e549a212@mail.gmail.com>
	<200705251706.23021.jhb@freebsd.org>
Subject: Re: Computer hangs on reboot
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I tried to add some debug output to cpu_reset_real() code:

  printf("cpu_reset_real(): before keyboard reset\n");
  outb(IO_KBD + 4, 0xFE);
  printf("cpu_reset_real(): after keyboard reset\n");

The last two lines I see on the screen when I try to reboot are:

cpu_reset_real(): before keyboard reset
c

So the computer is halted but doesn't go to reboot.