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. -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html - To unsubscribe from this list: send the line "unsubscribe linux-ide" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
