Robert Hancock wrote: > Tejun Heo wrote: >> Michael Sedkowski wrote: >>>> Hmmm... If the problem only shows up on nx6325, it might be that >>>> ACPI is >>>> pulling unnecessary stunt. Please apply the attached patch and report >>>> when the disk spins down and up. >>> Disk spins down on "Pre-shutdown prepare" and then goes up and down on >>> "Power down". >> >> 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? Thanks. -- tejun - To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
