Re: [PATCH] Dynamic tick for x86 version 050609-2

[Valdis . Kletnieks]

On Mon, 13 Jun 2005 20:01:11 +0200, Thomas Renninger said:

> > Should there be a C3/C4?  Is my laptop just plain borked? :)
> Depends on your machine and BIOS, whether it's supported -> seems as if it's not.
> 
> You could verify by having a deeper look in your FADT/DSDT.
> You need the acpi tools from Len Brown (acpidmp/acpixtract) and the iasl Intel ACPI
> compiler.
> AFAIK checking for C-support is rather robust in recent kernels as long as you don't have a broken
> DSDT table.

OK, found acpidmp and iasl, now have a decompiled DSDT - now to figure out
if it's busticated or not.... :)

> Maybe you find a newer BIOS supporting C3?

Nope, I just checked, and the A13 BIOS from 02/06/2004 is the latest that Dell
has released for the C840.  Not much hope there unless there's some special
secret site that even newer BIOS updates hide until they escape.. ;)
 
> To be honest, I doubt you save much power even with dyn tick enabled if you only have support
> for C1 and C2. The pmstats tool from Tony (see link above)
> could tell you nicely whether you gain anything.

Well, it's a start, anyhow. :)

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