On Thursday, 9 August 2007 17:06, Pavel Machek wrote:
> Hi!
>
> > >> Oh... crap, so acpi wants to sync cache on shutdown. I wonder whether
> > >> it spins down the disk correctly. Does emergency unload count increase
> > >> after each power down? Also, please post the result of 'dmidecode'.
> > >
> > > I know that my Compaq X1000-series laptop does do some kind of ACPI
> > > games with the disk on ACPI power off (I assume it is putting the disk
> > > in standby before power-off at least). It also does this if you boot
> > > into DOS, GRUB, etc. and then hit the power button. Could be if the disk
> > > is dumb enough to spin up for sync cache and standby when there is
> > > nothing to flush, and the kernel does its own standby, this could cause
> > > an extra spinup/down..
> >
> > Yeah, that seems to be what's going on. I don't think we have any other
> > choice than blacklisting those notebooks. This is a mess. How does the
> > other OS cope with this?
> >
> > I'm thinking about using DMI vendor/product match to detect the affected
> > systems but I think it would be better to match the ACPI implementation
> > directly. Is there a way to match specific ACPI implementation?
>
> Well.. unless they use some SMM trick, it is ACPI AML code telling
> kernel to spin the disk down. I guess we could detect that, and simply
> ignore the request.
Please see: http://lkml.org/lkml/2007/8/8/187
Greetings,
Rafael
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