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 - 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
