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[Bug 1490229] [NEW] Brightness set to maximum after DPMS standby

 

Public bug reported:

After configuring screen energy saving in KDE, I noticed that after DPMS
standby, my screen brightness is set to maximum. This is confirmed by
`cat /sys/class/backlight/intel_backlight/brightness`. The problem can
be easily reproduce by switching to standby manually using  `xset dpms
force standby`.

Steps to reproduce:
1) echo "300" | sudo tee  /sys/class/backlight/intel_backlight/brightness
2) cat /sys/class/backlight/intel_backlight/brightness 
This will report: 300
3) xset dpms force standby
4) Move mouse/press key
5) cat /sys/class/backlight/intel_backlight/brightness
This will report 937

ProblemType: Bug
DistroRelease: Ubuntu 15.10
Package: xorg 1:7.7+7ubuntu4
ProcVersionSignature: Ubuntu 4.1.0-3.3-generic 4.1.3
Uname: Linux 4.1.0-3-generic x86_64
ApportVersion: 2.18-0ubuntu7
Architecture: amd64
CurrentDesktop: KDE
Date: Sat Aug 29 21:26:27 2015
InstallationDate: Installed on 2015-08-10 (20 days ago)
InstallationMedia: Kubuntu 15.10 "Wily Werewolf" - Alpha amd64 (20150809)
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: xorg
UpgradeStatus: No upgrade log present (probably fresh install)

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


** Tags: amd64 apport-bug wily

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https://bugs.launchpad.net/bugs/1490229

Title:
  Brightness set to maximum after DPMS standby

Status in xorg package in Ubuntu:
  New

Bug description:
  After configuring screen energy saving in KDE, I noticed that after
  DPMS standby, my screen brightness is set to maximum. This is
  confirmed by `cat /sys/class/backlight/intel_backlight/brightness`.
  The problem can be easily reproduce by switching to standby manually
  using  `xset dpms force standby`.

  Steps to reproduce:
  1) echo "300" | sudo tee  /sys/class/backlight/intel_backlight/brightness
  2) cat /sys/class/backlight/intel_backlight/brightness 
  This will report: 300
  3) xset dpms force standby
  4) Move mouse/press key
  5) cat /sys/class/backlight/intel_backlight/brightness
  This will report 937

  ProblemType: Bug
  DistroRelease: Ubuntu 15.10
  Package: xorg 1:7.7+7ubuntu4
  ProcVersionSignature: Ubuntu 4.1.0-3.3-generic 4.1.3
  Uname: Linux 4.1.0-3-generic x86_64
  ApportVersion: 2.18-0ubuntu7
  Architecture: amd64
  CurrentDesktop: KDE
  Date: Sat Aug 29 21:26:27 2015
  InstallationDate: Installed on 2015-08-10 (20 days ago)
  InstallationMedia: Kubuntu 15.10 "Wily Werewolf" - Alpha amd64 (20150809)
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: xorg
  UpgradeStatus: No upgrade log present (probably fresh install)

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