FreeBSD 6.1 & 6.2 hanging and/or spontaneous rebooting

Kris Kennaway kris at
Wed Jan 31 01:39:53 UTC 2007

On Tue, Jan 30, 2007 at 07:20:47PM -0600, Joe Vender wrote:
> I think I've fixed the spontaneous reboot and system hang problem I've been 
> having with FBSD 6.1 & 6.2 as described in earlier threads of the same 
> subject. I'm now using FBSD 6.2 to send this message.
> What I did was to set a hint in /boot/device.hints and also /boot/loader.conf 
> to disable acpi
> hint.acpi.0.disabled="1"
> and then I set a hint to enable apm
> hint.apm.0.disabled="0"
> hint.apm.0.flags="0x20"
> plus I set apm and apmd to start at boot in /etc/rc.conf
> apm_enable="YES"
> apmd_enable="YES"
> and in /boot/loader.conf, I put
> apm_load="YES"
> The messages log shows that APM is being detected, and the computer now fully 
> powers down via "shutdown -p now".
> I've a suggestion. It would be nice if freebsd could try to detect if acpi is 
> supported on the computer in which it is being installed, and if none is 
> found, it should completely disable acpi and then check if apm is supported. 
> It should then set the appropriate settings to enable the correct power 
> management support for the computer. This would prevent this particular 
> spontaneous rebooting and hanging on old computers like mine which are 
> pre-acpi but have apm support.

It does try to detect it; the problem is apparently that your BIOS
lies and says "yep, ACPI capable!", but is in fact too buggy to use.
Look for a BIOS update if possible.

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