[Bug 1891510] [NEW] Advanced power management value doesn't change on power

[Mohammad Kazemi]

Public bug reported:

I recently edited /etc/hdparm.conf file to and set two different values for AMP level. One is "apm_battery = 128" when using battery and "apm = 255" when it's plugged to charger. 
But it seems this setting is only checked when system is starting and when I unplug charger, it can't distinguish and the value of `hdparm -B /dev/sda` doesn't change. 
I don't know if it's a bug or not. But it should probably work.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: hdparm 9.58+ds-4
ProcVersionSignature: Ubuntu 5.4.0-42.46-generic 5.4.44
Uname: Linux 5.4.0-42-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.6
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Thu Aug 13 18:08:44 2020
InstallationDate: Installed on 2020-08-03 (9 days ago)
InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
SourcePackage: hdparm
UpgradeStatus: No upgrade log present (probably fresh install)
mtime.conffile..etc.hdparm.conf: 2020-08-13T17:42:19.717404

** Affects: hdparm (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug focal

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https://bugs.launchpad.net/bugs/1891510

Title:
  Advanced power management value doesn't change on power

Status in hdparm package in Ubuntu:
  New

Bug description:
  I recently edited /etc/hdparm.conf file to and set two different values for AMP level. One is "apm_battery = 128" when using battery and "apm = 255" when it's plugged to charger. 
  But it seems this setting is only checked when system is starting and when I unplug charger, it can't distinguish and the value of `hdparm -B /dev/sda` doesn't change. 
  I don't know if it's a bug or not. But it should probably work.

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: hdparm 9.58+ds-4
  ProcVersionSignature: Ubuntu 5.4.0-42.46-generic 5.4.44
  Uname: Linux 5.4.0-42-generic x86_64
  ApportVersion: 2.20.11-0ubuntu27.6
  Architecture: amd64
  CasperMD5CheckResult: skip
  CurrentDesktop: ubuntu:GNOME
  Date: Thu Aug 13 18:08:44 2020
  InstallationDate: Installed on 2020-08-03 (9 days ago)
  InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
  SourcePackage: hdparm
  UpgradeStatus: No upgrade log present (probably fresh install)
  mtime.conffile..etc.hdparm.conf: 2020-08-13T17:42:19.717404

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