My harddrives are not going to powersave.

I have added the following lines into /etc/hdparm.conf:

command_line {
    hdparm -S 25 /dev/disk/by-uuid/42d40d37-2859-457c-93d0-e4c617d06d9f

command_line {
    hdparm -S 25 /dev/disk/by-uuid/e7274b44-09e1-4a3c-90e7-01327f8ed8d4

command_line {
    hdparm -S 25 /dev/disk/by-uuid/71223a72-6e5b-4075-9170-1e5f0217798c

but they apparently have no effect.

$ sudo hdparm -C /dev/sdc

 drive state is:  active/idle

all the time.

How to know if it is configuration problem or some disk activity wakens the drive? If it is disk activity, then how to know if it is it and which it was?

My OS is Ubuntu 14.04.1 LTS.

  • What does hdparm -B /dev/sdc say? If your APM_level is greater than 127, see the meaning of -B in man hdparm.
    – goldilocks
    Jan 13, 2015 at 12:52
  • It says APM_level = not supported
    – Dims
    Jan 13, 2015 at 13:51
  • 1
    @goldilocks, APM is obsolete junk from the days before ACPI.
    – psusi
    Jan 13, 2015 at 14:02

1 Answer 1


Known bug in udisks. Upgrading to 15.04 will fix it: https://launchpad.net/bugs/1281588

  • Is it affects if I don't use Gnome or GUI?
    – Dims
    Jan 13, 2015 at 14:15
  • @Dims, hrm.. if you don't ever log into the gui, then no, I don't think udisks runs. Run ps aux and see if udisksd is running.
    – psusi
    Jan 13, 2015 at 14:16
  • I probably did logged into GUI, but i'd better kill it than upgrade from LTS to non-LTS.
    – Dims
    Jan 13, 2015 at 14:18
  • udisksd is not running and not installed on my system
    – Dims
    Jan 13, 2015 at 14:21
  • 1
    @Dims, then you have something else that keeps touching the disks. You might use blktrace to find out what.
    – psusi
    Jan 13, 2015 at 14:50

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