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how to debug a kernel that does not power off?

DISCUSSION Ákos Maróy 3 participants 3 messages Mar 23, 2010 – Mar 27, 2010 ACPI

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Ákos Maróy

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#0 lore raw

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

#1 lore raw

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

Regards,
Arnout

Quoted 21 lines · 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
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Arnout Vandecappelle                               arnout at mind be
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#2 lore raw
Quoted 4 lines · Arnout Vandecappelle

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.

Quoted 17 lines · Ákos Maróy
Quoted 15 lines

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..

Quoted 7 lines
Quoted 6 lines

Akos
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