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Re: weird ACPI error messages on Compaq laptop

On Sun, Feb 07, 2010 at 06:50:06PM +0100, Rhialto wrote:

> - Every 30 seconds or so there are some strange ACPI error messages: ACPI
>     Error (psargs-0464): [\_PR_.CPU0._PPC] Namespace lookup failure,
>     AE_NOT_FOUND ACPI Error (psparse-0627): Method parse/execution failed
>     [\CPUL] (Node 0xffff800007b26700), AE_NOT_FOUND ACPI Error
>     (psparse-0627): Method parse/execution failed [\_TZ_.TZ01.OTHD] (Node
>     0xffff800007b26960), AE_NOT_FOUND ACPI Error (psparse-0627): Method
>     parse/execution failed [\_TZ_.TZ01._TMP] (Node 0xffff800007b26a40),
>     AE_NOT_FOUND acpitz0: failed to evaluate _TMP

Generally, these are the symptoms; the real error happens somewhere else,
likely in

> ioapic0 at mainbus0 apid 4: pa 0xfec00000, version 20, 24 pins
> acpi0 at mainbus0: Intel ACPICA 20080321
> acpi0: X/RSDT: OemId <HPQOEM,SLIC-MPC,00000001>, AslId <    ,01000013>
> ACPI Error (evregion-0427): No handler for Region [ERAM] (0xffff800007b3aa80) 
> [EmbeddedControl] [20080321]
> ACPI Error (exfldio-0390): Region EmbeddedControl(3) has no handler [20080321]
> ACPI Error (psparse-0627): Method parse/execution failed [\_SB_.PCI0._INI] 
> (Node 0xffff800007b43100), AE_NOT_EXIST
> acpi0: SCI interrupting at int 9

Unfortunately it is rather difficult to say what is going on in here. This
points to the direction of acpiec(4), but deep down this may well be a bug
in the ACPICA itself (or in the BIOS/DSDT of the laptop).

It seems that HP laptops are generally something to avoid if the plan is to
run (Net)BSD :-(.

> Do we pretend to be Linux for the purpose of running ACPI?

No. Everyone pretends to be some version of Windows. And AFAIK, Linux people
strongly discourage vendors to target Linux specifically, which is good as
this gives at least some common denominator. That said, the OS-specific ACPI
execution paths are often exaggerated; in reality the differences are
typically minor.

- Jukka.

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