Re: hdparm -Y hangup

> > > Hrm, OK thanks for the info. Perhaps it should be removed
> > > from hdparm or a (DANGEROUS) put beside the description
> > > until it's fixed.
> > 
> > The person to contact would be Mark Lord, the hdparm maintainer, (see the
> > hdparm manual page for his E-Mail address).
> 
> Rather than have Mark Lord set the option DANGEROUS (it shouldn't be)
> perhaps it could be made to work more than once... Odd problem, is
> something not getting set or cleared when the drive is spun up the first
> time?

With my Maxtor disk connected to a PIIX3 IDE interface and stock kernel 2.4.19, I get this behavior:

# hdparm -Y /dev/hda

Disk sleeps

# find

No disk activity - it doesn't wake up.  It doesn't work once for me, it always hangs on the first attempt.

So, I try dmesg on another console - no new output.

# hdparm -w /dev/hda

Performs a device reset, and the disk spins up.

# dmesg

hda: ide_set_handler: handler not null; c0181050
hda: dma_intr: status=0xd0 { Busy }
hda: DMA disabled
hda: ide_set_handler: handler not null; old=c0181050, new=c017b160
bug: kernel timer added twice at c017afe1.
hda: ide_set_handler: handler not null; old=c017b160, new=c017b160
ide0: reset: success

Obviously, if you're going to try to repeat this, sync the disk beforehand, because I assume that a device reset will loose data in the disk's write cache.

John.