[Bug 913050] Re: Explicit APM values in hdparm-functions cause Load Cycle Count hell

[David Barker]

*** This bug is a duplicate of bug 952556 ***
    https://bugs.launchpad.net/bugs/952556

** This bug is no longer a duplicate of bug 984308
   ATA failures when operating on battery power in Ubuntu 12.04
** This bug has been marked a duplicate of bug 952556
   [Precise] [Hardware-killer] HD restarts every few seconds

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https://bugs.launchpad.net/bugs/913050

Title:
  Explicit APM values in hdparm-functions cause Load Cycle Count hell

Status in “hdparm” package in Ubuntu:
  Fix Committed

Bug description:
  Release: 12.04 (development) maybe 11.10 is affected too?
  Hard drive:
  Model Family:     Seagate Momentus 5400.6
  Device Model:     ST9250315AS

  In recent hdparm version explicit APM values are set in /lib/hdparm
  /hdparm-functions. "On AC" value = 254, "on battery value" = 127. This
  causes load cycle hell on my disk drive. Even 128 causes the same
  thing, so 11.10 seems to be affected too.

  Lines in question:

  hdparm_options()
  {
      local WANTED_DISK="$1"

      local DISC= DEFAULT= DEF_QUIET= COMMAND_LINE=
      # if the below is guaranteed to spawn a subshell, then this next line is
      # unnecessary
      local OPTIONS OPT_QUIET KEY SEP VALUE

      egrep -v '^[[:space:]]*(#|$)' /etc/hdparm.conf |
      {
          # set our default global apm policy here.
          if hdparm_try_apm "$WANTED_DISK"; then
              if hdparm_is_on_battery; then
                  hdparm_set_option -B127
              else
                  hdparm_set_option -B254
              fi
          fi

  There obviously must be some workarounds by setting right values in
  /etc/hdparm.conf but I can not elaborate any further.

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