Messages in this thread |  | | | Date | Wed, 16 Jun 2010 09:53:00 +0200 | | From | Pavel Machek <> | | Subject | Re: [linux-pm] idle-test patches queued for upstream |
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On Thu 2010-05-27 20:59:07, Len Brown wrote: > > > ... we think we can do better than ACPI. > > > Why exactly? Is there any info missing in the ACPI tables? > > Or is this just to be more independent from OEMs? > > ACPI has a few fundmental flaws here. One is that it reports > exit latency instead of break-even power duration. > The other is that it requires a BIOS writer to > get the tables right. > > Both of these are fatal flaws.
Intel is co-author of ACPI spec, right? So what about fixing those?
> > > Indeed, on my (production level commerically available) Nehalem desktop > > > the ACPI tables are broken and an ACPI OS idles at 100W. With this > > > driver the box idles at 85W. > > > What exactly was broken there? > > Dell's BIOS developer botched a bug fix immediately before the system > went to market and disabled support for all ACPI C-states except C1. > After several month of shipping systems, they still were unable > to ship them with a fixed BIOS.
I always thought that cpu vendors have ways to work with bios manufacturers...
-- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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