Re: 2.6.13-rc3 Battery times at 100/250/1000 Hz = Zero difference

Bill Davidsen
2005-07-25T19:01:10Z

Tony Lindgren wrote:
> * Voluspa <lista1@telia.com> [050722 11:46]:
>
>>On Fri, 22 Jul 2005 20:02:36 +0200 Pavel Machek wrote:
>>
>>>will not help. It seems like your machine is simply not able to do
>>>reasonable powersaving.
>>
>>Digging up this patch from last month regarding C2 on a AMD K7 implies
>>that the whole blame can be put on kernel acpi:
>>
>>http://marc.theaimsgroup.com/?l=linux-kernel&m=111933745131301&w=2
>
>
> AFAIK Linux ACPI expects BIOS to contain all the necessary stuff to enable
> C2 and C3. Otherwise they won't get enabled, and you have to create a custom
> module like the amd76x_pm is.

Does that imply that Windows actually has such non-BIOS code, or just
knows how to find the BIOS code better, or knows how to do other things,
or ???
>
> There's been some talk on adding a module to enable C2 and C3 states for
> various chipsets, but nobody seems to have enough time to do it...

I like your first thought better, "Linux ACPI expects BIOS to contain
all the necessary stuff" I have a bunch of laptops of various ages, and
I would expect at least the most recent, an ASUS 16??, using a
"Centrino" chipset, to be supported. It's one of the top few laptopl
chipsets, and Windows can suspecd it. Can also not only detect but use
the 1400x1050 screen, but that's another issue :-(

Is it possible that the code to find these capabilities is not fully
functional? That seems more likely than the system not having the
capability. NOTE: "seems" as in experienced guess unsupported by other
relevant information.

--
-bill davidsen (davidsen@tmr.com)
"The secret to procrastination is to put things off until the
last possible moment - but no longer" -me