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[Jean-Philippe Guérard <1407818@xxxxxxxxxxxxxxxxxx>]

** Description changed:

  On a desktop system, on AC power, pm-utils reset the vm.dirty_ratio and
  vm.dirty_background_ratio at boot time (which also reset the
  vm.dirty_bytes and vm.dirty_background_bytes variables).
  
  When setting these variables using sysctl.conf, they are silently reset
  by the /usr/lib/pm-utils/power.d/laptop-mode script shipped with pm-
  utils.
  
  The only way to give specific values to these variables using sysctl is
  to remove this script.
+ 
+ The default values applied by pm-utils are vm.dirty_background_ratio=5
+ and vm.dirty_ratio=10. On my 64-bits system with 16 GB RAM, this amounts
+ to 1.6 GB for vm.dirty_bytes and 800 MB for vm.dirty_background_bytes
+ (see http://lwn.net/Articles/572911/). These values are not reasonable
+ for my system and pm-utils prevents me to change them.
  
  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: pm-utils 1.4.1-13ubuntu0.1 [modified: usr/lib/pm-utils/power.d/laptop-mode]
  ProcVersionSignature: Ubuntu 3.13.0-44.73-generic 3.13.11-ckt12
  Uname: Linux 3.13.0-44-generic x86_64
  NonfreeKernelModules: fglrx
  ApportVersion: 2.14.1-0ubuntu3.6
  Architecture: amd64
  CurrentDesktop: XFCE
  Date: Mon Jan  5 23:00:09 2015
  PackageArchitecture: all
  SourcePackage: pm-utils
  UpgradeStatus: Upgraded to trusty on 2014-04-21 (259 days ago)

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https://bugs.launchpad.net/bugs/1407818

Title:
  pm-utils reset the vm.dirty_ratio and vm.dirty_background_ratio
  variables

Status in pm-utils package in Ubuntu:
  New

Bug description:
  On a desktop system, on AC power, pm-utils reset the vm.dirty_ratio
  and vm.dirty_background_ratio at boot time (which also reset the
  vm.dirty_bytes and vm.dirty_background_bytes variables).

  When setting these variables using sysctl.conf, they are silently
  reset by the /usr/lib/pm-utils/power.d/laptop-mode script shipped with
  pm-utils.

  The only way to give specific values to these variables using sysctl
  is to remove this script.

  The default values applied by pm-utils are vm.dirty_background_ratio=5
  and vm.dirty_ratio=10. On my 64-bits system with 16 GB RAM, this
  amounts to 1.6 GB for vm.dirty_bytes and 800 MB for
  vm.dirty_background_bytes (see http://lwn.net/Articles/572911/). These
  values are not reasonable for my system and pm-utils prevents me to
  change them.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: pm-utils 1.4.1-13ubuntu0.1 [modified: usr/lib/pm-utils/power.d/laptop-mode]
  ProcVersionSignature: Ubuntu 3.13.0-44.73-generic 3.13.11-ckt12
  Uname: Linux 3.13.0-44-generic x86_64
  NonfreeKernelModules: fglrx
  ApportVersion: 2.14.1-0ubuntu3.6
  Architecture: amd64
  CurrentDesktop: XFCE
  Date: Mon Jan  5 23:00:09 2015
  PackageArchitecture: all
  SourcePackage: pm-utils
  UpgradeStatus: Upgraded to trusty on 2014-04-21 (259 days ago)

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