linux-kernel - Re: 32-bit Athlon X2 won't poweroff

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Message-ID: <470029BA.3070106@rtr.ca>
Date:	Sun, 30 Sep 2007 18:56:58 -0400
From:	Mark Lord <lkml@....ca>
To:	Santiago Garcia Mantinan <manty@...ty.net>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: 32-bit Athlon X2 won't poweroff 

Mark Lord wrote:
>..
> So next is inside the kernel itself, at linux/kernel/sys.c :: sys_reboot(),
> where we see this code:
> 
>        /* Instead of trying to make the power_off code look like
>         * halt when pm_power_off is not set do it the easy way.
>         */
>        if ((cmd == LINUX_REBOOT_CMD_POWER_OFF) && !pm_power_off)
>                cmd = LINUX_REBOOT_CMD_HALT;
> 
> This converts a "poweroff" into a "reboot" if no machine dependent
> power off function has been bound in (pm_power_off() is a function 
> pointer).

Duh.. fingers failed to follow brain:  that converts a "poweroff" into a "halt",
which is what you are seeing.  

> So for this to work, I believe that either ACPI or APM has to have been
> configured into the kernel (and the modules loaded).  Your kernel .config
> from earlier shows ACPI built-in to the kernel core, so it should be 
> present.
> 
> Unless you booted with noacpi or some such parameter..
> So let's have a look at the kernel boot logs,
> and you could also try CONGIG_ACPI_DEBUG=y
> 
> Bizarre (and nothing to do with my patch).
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