On 10/28/2017 12:07 PM, Ralf Jung wrote:
> Package: hdparm
> Version: 9.51+ds-1
> Severity: normal
>
> Dear Maintainer,
>
> hdparm.conf says:
>
> ## /sbin/hdparm is not run unless a block of the form:
> ## DEV {
> ## option
> ## option
> ## ...
> ## }
> ## exists.
>
> However, thta turns out to be wrong. My hdparm.conf only contains a
block for
> /dev/sdb, and yet:
>
> # /lib/systemd/system-sleep/hdparm post
>
> /dev/sda:
> setting Advanced Power Management level to 0xfe (254)
> APM_level = 254
>
> /dev/sdb:
> setting Advanced Power Management level to 0xfe (254)
> APM_level = 254
>
> /dev/sdb:
> setting standby to 50 (4 minutes + 10 seconds)
>
> As you can see, hdparm is called for /dev/sda as well.
>
> Kind regards,
> Ralf
> -- Configuration Files:
> /etc/hdparm.conf changed:
> quiet
> /dev/sdb {
> #apm = 254
> #apm_battery = 254
> # spin-down time of 4:10 min (=50*5 seconds)
> spindown_time = 50
> }
You are right, hdparm shouldn't be touching all disk in the system, but
there is a reason. The issue is summarized here:
https://wiki.ubuntu.com/DanielHahler/Bug59695
https://bugs.launchpad.net/ubuntu/+source/acpi-support/+bug/59695
Currently -B 254 on AC power and -B 128 on battery seem to be the
sensible default values for the vast majority of disks and are set for
every disk supporting APM.
These defaults are defined in /lib/hdparm/hdparm-functions in
hdparm_option() function.
The (ancient) documentation of hdparm need to be updated to note
these defaults.
Best regards,
Alex
