Re: CVS commit: src

[Jukka Ruohonen <jruohonen%iki.fi@localhost>]

On Fri, Aug 27, 2010 at 04:03:20PM +1000, matthew green wrote:
> not sure exactly what that means here... but maybe acpicpu should 
> default to blacklisting P4's?  for when it becomes a normal driver
> that is enabled by default..

Blacklisting based on processor type sounds reasonable, but somewhat
problematic.  We can safely let acpicpu(4) attach but disable specific
functionality like P-states. However, how sure can we be that ICH-based
SpeedStep was available only in P4s?  I also think that at least some
P4-models (Prescott?) want to use ACPI. Thus, I think the real issue is
more about piixpcib(4) rather than ichlpcib(4).

> FWIW, acpi_cpu doesn't work for my P4 with speedstep, and all sorts of
> things are missing without acpi (including stability under load.)  it
> has no old-skool APM (unlike most laptops from that era.)

Pentium 4 is not really that old; ACPI is certainly present. If you send
(off-list) the acpidump(8) output to me, we can ensure that this is not a
firmware bug specific to this laptop, or a bug in acpicpu(4) itself.

- Jukka.