Re: 2.6.18-rc2, problem to wake up spinned down drive?

[Bill Davidsen <davidsen@tmr.com>]

Tejun Heo wrote:
> Harald Dunkel wrote:
> > Tejun Heo wrote:
> > > Can you try the following instead of hdparm?
> > >
> > > echo 1 > /sys/bus/scsi/devices/1:0:0:0/power/state
> > >
> > > It will make libata involved in putting the disk to sleep and waking it
> > > up, and, when waking, it will kick the drive in the ass by resetting the
> > > channel.  Please try with the latest -rc kernel.
> >
> > Sorry to say, but this did not work:
> >
> > # echo 1 > /sys/bus/scsi/devices/0:0:0:0/power/state
> > bash: echo: write error: Invalid argument
> > # ll !$
> > ll /sys/bus/scsi/devices/0:0:0:0/power/state
> > -rw-r--r-- 1 root root 0 Aug  1 20:00 
> > /sys/bus/scsi/devices/0:0:0:0/power/state
> > # cat !$
> > cat /sys/bus/scsi/devices/0:0:0:0/power/state
> > 0
> > # uname -a
> > Linux bugs 2.6.18-rc3 #2 PREEMPT Sun Jul 30 16:26:22 CEST 2006 i686 
> > GNU/Linux
>
> You probably should do 'echo -n 1', the parsing function is pretty picky.
Given that the data from the "cat" of state returned a zero with 
newline, perhaps unreasonably picky. On a Fedora kernel it just doesn't 
seem to work for SATA drives, sample size = 1.

--
Bill Davidsen <davidsen@tmr.com>
  Obscure bug of 2004: BASH BUFFER OVERFLOW - if bash is being run by a
normal user and is setuid root, with the "vi" line edit mode selected,
and the character set is "big5," an off-by-one errors occurs during
wildcard (glob) expansion.
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