how to debug a kernel that does not power off?

how to debug a kernel that does not power off?

[Ákos Maróy]

Hi,

This might be a lame question, but: how would I debug a kernel that
simply does not power off a machine? When powering off, on the console I
get to the message: [...] Poweroff.

but then, the machine actually does not power off. This is an HP Envy 15
laptop using an intel i7 CPU, and kernel 2.6.32.9.

I tried to read up on all sorts of documentation, but could not get more
debug info out of the kernel :(

any pointers would be welcome..


Akos

Re: how to debug a kernel that does not power off?

[Arnout Vandecappelle]

 Take a look at the pm_power_off functions in arch/x86/kernel/apm_32.c

 Regards,
 Arnout

On Wednesday 24 March 2010 00:44:30, Ákos Maróy wrote:
> Hi,
> 
> This might be a lame question, but: how would I debug a kernel that
> simply does not power off a machine? When powering off, on the console I
> get to the message: [...] Poweroff.
> 
> but then, the machine actually does not power off. This is an HP Envy 15
> laptop using an intel i7 CPU, and kernel 2.6.32.9.
> 
> I tried to read up on all sorts of documentation, but could not get more
> debug info out of the kernel :(
> 
> any pointers would be welcome..
> 
> 
> Akos
> --
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-- 
Arnout Vandecappelle                               arnout at mind be
Senior Embedded Software Architect                 +32-16-286540
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Re: how to debug a kernel that does not power off?

[Robert Hancock]

On 03/26/2010 01:56 PM, Arnout Vandecappelle wrote:
>   Take a look at the pm_power_off functions in arch/x86/kernel/apm_32.c
>
>   Regards,
>   Arnout

Any modern machine will be using ACPI functions to power off, not APM.. 
CCing the linux-acpi list.

>
> On Wednesday 24 March 2010 00:44:30, Ákos Maróy wrote:
>> Hi,
>>
>> This might be a lame question, but: how would I debug a kernel that
>> simply does not power off a machine? When powering off, on the console I
>> get to the message: [...] Poweroff.
>>
>> but then, the machine actually does not power off. This is an HP Envy 15
>> laptop using an intel i7 CPU, and kernel 2.6.32.9.
>>
>> I tried to read up on all sorts of documentation, but could not get more
>> debug info out of the kernel :(
>>
>> any pointers would be welcome..
>>
>>
>> Akos
>> --
>> To unsubscribe from this list: send the line "unsubscribe linux-kernel"
>> in the body of a message to majordomo@vger.kernel.org
>> More majordomo info at  http://vger.kernel.org/majordomo-info.html
>> Please read the FAQ at  http://www.tux.org/lkml/
>