Re: ACPI power down problem

[Len Brown <lenb@kernel.org>]

On Thursday 06 December 2007 20:18, Stephan Seidl wrote:
> Hi,
> I would like to ask two questions, but firstly some history.
> Normally Debian Sarge is running with the kernel 2.6.14.3 with several
> patches and all works fine since Dec 2005. In Jul, 2006, I tried another
> kernel, 2.6.17.4, again with several patches, and again all worked fine
> with the exception of the fact that the machine did not switch off the
> power on `/sbin/shutdown -t5 -h -P now'. So I rejected the kernel
> 2.6.17.4 hoping that the problems would disappear by itself with the time.
> But, it did not.
> In Aug 2007, Debian 4.0 r1 appeared with a kernel 2.6.18..., still
> having the power down problem. Obviously, the problem has been introduced
> between 2.6.14.3 and 2.6.17.4 and I am the only who has it. The concerning
> board can be described by
> 
>   Award Medallion BIOS v6.0, An Energy Star Ally
>   ASUS P4B ACPI BIOS Revision 1013 Beta 004
>   Award Plug and Play BIOS Extension v1.0A
> 
> This week, to tackle the problem, I addionally applied the patches
> in the attachment to have the console messages somewhat longer on the screen.
> I got the same output with the two kernels, 2.6.14.3 and 2.6.17.4, namely
> 
>   Power down.
>   acpi_power_off called
>    hwsleep-0284 [01] enter_sleep_state     : Entering sleep state [S5]
> 
> whereat the line numer 0284 changed to 0283 for 2.6.17.4.
> What in fact happens after the above has been seen for 20 seconds is that
> the same machine switches off in case of 2.6.14.3, and wrongly reboots in
> case of 2.6.17.4. Now the questions, firstly,
> is that a kernel bug ? From my point of view, yes, it seems to be one.
> Secondly, if I would more or less stupidly put the debugging into execution,
> is there anyone who could guide me, because in the ACPI kernel environment,

yes, it is a bug.
please try linux-2.6.23.stable and see if it still resets on poweroff there.

see if there is any difference when you boot with "maxcpus=1".

cheers,
-Len