Re: No support of BIOS power management for SCSI disks?
According to Bruce Perens <bruce@pixar.com>:
>
> OK. First of all, you will have to build a custom kernel to get APM support,
> as the generic kernel does not have it. Why? Because some machines have bad
> APM BIOS and crash on installation if we leave it in. We know of at least
> one laptop that does this.
Hm, I don't have a laptop and the help text for this kernel option says:
: Generally, if you don't have a battery in your machine, there isn't much
: point in using this driver.
So, I guess turning this option on doesn't help me much, right?
> > When I turn on the HDD power saving in the BIOS setup I don't
> > see (or should I write 'hear' :-) that any of my 2 SCSI disks is
> > turned off after a specific idle time. So, I guess the BIOS only
> > supports IDE disks, right?
>
> Since Linux is not using the BIOS hard disk driver in any case, you
> should not use the BIOS hard disk timeout. I'm not sure if the "hdparm"
> tool will tell a SCSI disk when it can spin down or not.
Thanks for this pointer. Unfortunately, you were right: 'hdparm'
can't handle SCSI disks.
> You might install "hwutils" and try that.
I haven't found this yet, but will check it out.
Is Linux using the BIOS APM settings (CPU frequency lowering etc.) at all?
Thanks a lot for your hints!
Andy.
____________________________________________________________________
Andy Spiegl, PhD Student, Technical University, Muenchen, Germany
E-Mail: spiegl@Appl-Math.TU-Muenchen.de
URL: http://www.appl-math.tu-muenchen.de/~spiegl
PGP fingerprint: B8 48 24 7B DB 96 6F 1C D9 6D 8E 6C DB C2 E7 E9
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