Re: ACPI C4 support

Stefan Behlert
2004-03-01T18:09:58Z

Moin,

On Mar 01, 04 16:28:10 +0100, Bruno Ducrot wrote:
> On Sat, Feb 28, 2004 at 05:10:11PM +0100, Pavel Machek wrote:
> > Hi!
> > Thomas told me:
> > >what about C4 - Cn states in the kernel implementation?
> > >A short look into the /proc/acpi/processor/.../power file let me think
> > >that only C0-C3 is supported by the kernel, even specification talks
> > >about Cn states?
> > As a first step, it would be nice if kernel at least used C0..C3 if
> > the machine supports them... This should do the trick. Does it look
> > okay?
>
> No. pblk_length is 0 or 6. Not 5 nor 7 ;)

Sorry, I don't understand: We've a Laptop with a DSDT with
Processor (\_PR.CPU0, 0x01, 0x00001010, 0x07)
in it.
Comment from the responsible BIOS-team:
"Our processor block object is 7 bytes in length because we also support
C4 (P_LVL4) which is at <P_BLK>+6. Therefore, the size/length must be
reported as 7 and not 6."

Is the '7' the BIOS-developer mentioned the same '7' as mentioned by you?

>
> Look at http://bugzilla.kernel.org/show_bug.cgi?id=1958

>
> Note that I don't have time to work on it by now. When the acpi video
> extension will be OK, I will rework on that one unless someone else do
> the work.

Thanks.

>
> --
> Bruno Ducrot

caio,
Stefan

--
Stefan Behlert, SUSE LINUX AG,
Mobile Devices

Maxfeldstr. 5, D-90409 Nuernberg, Germany
Phone +49-(0)911-74053-173