Date: Wed, 21 Nov 2007 12:22:02 -0800 From: Nate Lawson <nate@root.org> To: "Alexandre \"Sunny\" Kovalenko" <alex.kovalenko@verizon.net> Cc: acpi@freebsd.org Subject: Re: acpi_thermal User Overriden Parameters Reset on Power State Change Message-ID: <4744936A.6090002@root.org> In-Reply-To: <1195675813.56779.42.camel@RabbitsDen> References: <1195536301.1271.11.camel@localhost> <1195675813.56779.42.camel@RabbitsDen>
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Alexandre "Sunny" Kovalenko wrote:
> On Tue, 2007-11-20 at 16:25 +1100, Nick Withers wrote:
>> Hi y'all,
>>
>> Firstly, sorry if this isn't entirely the correct place to post this,
> I think acpi@ would be the better place (forwarded).
>
>> for starters I'm not sure whether this problem is limited to -CURRENT
>> and / or 7.0 or not. Tried to have a look at fixing it myself, but I'm
>> not l33t enough! :-)
>>
>> On my Compaq Presario B3820 (PV142PA#ABG) laptop, I override the
>> hw.acpi.thermal.tz0._PSV value because the default is the temperature at
>> which the CPU is halted by the hardware until the temperature settles
>> down. Since this gets triggered fairly often and is pretty annoying, I
>> lower the trigger temperature level and have powerd(8) work
>> passive-cooling-shaped magic.
>>
>> However, disconnecting or reconnecting AC power resets the value to the
>> BIOS provided level.
>>
>> Would anyone be able to offer assistance with this? It's not too big a
>> deal, I just have to remember to set the appropriate value again if the
>> power state changes.
>>
> At the very least, you do not have to remember to do this: at the bottom
> of /etc/devd.conf there is an example on how to associate your custom
> script with AC state changes. Look for something like:
>
> # This example calls a script when the AC state changes, passing the
> # notify value as the first argument. If the state is 0x00, it might
> # call some sysctls to implement economy mode. If 0x01, it might set
> # the mode to performance.
> notify 10 {
> match "system" "ACPI";
> match "subsystem" "ACAD";
> action "/etc/acpi_ac $notify";
> };
>
> As to changing _PSV value for good: you can dump your ASL (look for
> instructions in the Handbook), then look for something like
>
> Method (_PSV, 0, NotSerialized)
> {
> Return (0xE30)
> }
>
> modify value, remembering that <return value> = <degree C> * 10 + 2732,
> recompile your ASL and override it on boot (handbook comes handy there as well).
Alexandre, thank you for your detailed and accurate reply. I really
appreciate the work of users in helping share information about acpi.
If you ever want to submit examples for the acpi section of the
handbook, this kind of FAQ would be useful.
--
Nate
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