Robert Hancock wrote:Tejun Heo wrote:Michael Sedkowski wrote:I know that my Compaq X1000-series laptop does do some kind of ACPIOh... crap, so acpi wants to sync cache on shutdown. I wonder whetherHmmm... If the problem only shows up on nx6325, it might be thatDisk spins down on "Pre-shutdown prepare" and then goes up and down on
ACPI is
pulling unnecessary stunt. Please apply the attached patch and report
when the disk spins down and up.
"Power down".
it spins down the disk correctly. Does emergency unload count increase
after each power down? Also, please post the result of 'dmidecode'.
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?