linux-kernel - Re: [PATCH 1/1] cpufreq: eeepc 900 frequency scaling driver

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Date:	Tue, 17 Mar 2009 09:30:48 +0100
From:	Fabio Comolli <fabio.comolli@...il.com>
To:	Pavel Machek <pavel@....cz>
Cc:	Len Brown <lenb@...nel.org>, Matthew Garrett <mjg@...hat.com>,
	Cristiano Prisciandaro <cristiano.p@...net.ch>,
	Dave Jones <davej@...hat.com>, cpufreq@...r.kernel.org,
	linux-kernel@...r.kernel.org, tom@...pton.nu
Subject: Re: [PATCH 1/1] cpufreq: eeepc 900 frequency scaling driver

Well, I see that this thread has resumed after three months of being idle.
Is there a chance that either Cristiano's or Tom's version can be included?

By the way, I currently run my eeepc 900 with cpufreq disabled.
Looking at the patch, with Tom's mods to eeepc_laptop I could do the
same, am I right? I see only an include for cpufreq.h and nothing
else.

Thanks,
Fabio



On Mon, Mar 16, 2009 at 9:29 AM, Pavel Machek <pavel@....cz> wrote:
> On Mon 2009-03-16 00:24:18, Len Brown wrote:
>>
>> On Tue, 2 Dec 2008, Pavel Machek wrote:
>>
>> > On Tue 2008-12-02 16:15:21, Matthew Garrett wrote:
>> > > On Sun, Nov 23, 2008 at 07:04:09PM +0100, Pavel Machek wrote:
>> > >
>> > > > Is this really needed? Could we simply talk to the cpu directly,
>> > > > without help of ACPI?
>> > >
>> > > No. The ACPI write ends up talking to the embedded controller and some
>> > > io ports.
>> >
>> > Oops... I always knew that eee-s are broken by design (reporting
>> > battery percent as mWh, etc...) but I did not realize how bad it
>> > is. (ACPI has perfectly standard cpu frequency scaling interface, even
>> > if it is not used too often these days....)
>>
>> Huh?
>>
>> What cpufreq driver is deployed more broadly than acpi-cpufreq?
>> AFAIK, Linux uses it on nearly every ACPI compliant Intel-based
>> system that has frequency scaling.
>
> Problem seems to be that eee uses custom ACPI methods
> (switch_to_fast_clock(0/1)-like), not anything acpi-cpufreq could
> drive... Broken by design :-(.
>                                                                        Pavel
> --
> (english) http://www.livejournal.com/~pavelmachek
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