Re: Proper way to enable ACPI_DEBUGGER; debugging lack of ac online/offline updates

[Alexey Starikovskiy <alexey_y_starikovskiy@linux.intel.com>]

You might as well check if bugzilla.kernel.org bug #5534 is related to your problem.
Enabling ACPI_DEBUG
1. you enable ACPI debugging in ACPI menu of kernel config
2. you write different values to /proc/acpi/acpi_debug_layer and acpi_debug_level.

Regards,
	Alex.

Eric Anderson wrote:
> I've been trying to figure out what is going wrong with Linux ACPI
> support on the HP nw9440.  One of the problems that I've had is that
> when the AC adapter is removed, the acpi status doesn't get updated.
> I have discovered that if I boot with 2.6.14, wait for it to hang, and
> then reboot with 2.6.17.7, I have functional notification of the AC
> adapter state changes.
> 
> I'm attempting to work out what the difference is between these two
> runs, and I have found a first difference that in the non-working
> case, acpi_ex_opcode_2A_0T_0R is called which queues a deferred
> execution, and prints out the message "bus_get_device: No context for
> object [...]".  In the working case, that path is never executed.
> 
> I'm trying to figure out what the difference is between the AML that
> gets executed along the two paths, and near as I can tell, if I could
> enable ACPI_DEBUGGER, I would get the trace of executed AML, and I
> could start working out what is going wrong.  However, I can't find
> any kernel config option to enable ACPI_DEBUGGER, and all of my google
> searches around that haven't found anything that describes how it
> should work, nor has wandering around the acpi4linux wiki, other
> acpi4linux web pages, nor the mailing list archives.
> 
> I therefore have three questions: 
>   a) what is the proper way to enable ACPI_DEBUGGER option
>   b) will it print out a trace of executed AML as I'm expecting
>   c) is there some other debugging path that I should be trying to get
>      this to work?
> 
> Thanks, please CC me directly as I'm not subscribed to the linux-acpi
> mailing list.
> 	-Eric
> 
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