Public bug reported:
When plugging-in the AC adapter, the backlight brightness is
automatically set to a specific value, overriding any previously set
user-defined value.
#Brightness value set after plugging-in AC Adapter
$ cat /sys/class/backlight/intel_backlight/actual_brightness
5850898
The above value corresponds to 60% of maximum brightness.
Similarly, when plugging-out the AC adapter, the backlight brightness is
automatically set, albeit to a lower value
#Brightness value set after plugging-in AC Adapter
$ cat /sys/class/backlight/intel_backlight/actual_brightness
4517782
The above value corresponds to 48% of maximum brightness.
Expected behavior when plugging-out AC adapter
> If brightness below 48% threshold, do nothing
> Else, set brightness to 48%
Expected behaviour when plugging-in AC adapter
> If brightness below 60% threshold, set brightness to 60%
> Else do nothing.
Also, the threshold levels should be user-definable.
ProblemType: Bug
DistroRelease: Ubuntu 12.10
Package: linux-image-3.5.0-17-generic 3.5.0-17.28
ProcVersionSignature: Ubuntu 3.5.0-17.28-generic 3.5.5
Uname: Linux 3.5.0-17-generic x86_64
ApportVersion: 2.6.1-0ubuntu6
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: leonard 2440 F.... pulseaudio
Date: Sat Nov 3 18:23:33 2012
EcryptfsInUse: Yes
HibernationDevice: RESUME=UUID=7afe6b04-8cc4-420d-9c26-f63c28f60d93
InstallationDate: Installed on 2012-10-28 (5 days ago)
InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Release amd64 (20121017.5)
MachineType: Hewlett-Packard HP Compaq 6710b (KU234ES#ABV)
MarkForUpload: True
PccardctlIdent:
Socket 0:
no product info available
PccardctlStatus:
Socket 0:
no card
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.5.0-17-generic
root=/dev/mapper/ubuntu-root ro quiet splash vt.handoff=7
RelatedPackageVersions:
linux-restricted-modules-3.5.0-17-generic N/A
linux-backports-modules-3.5.0-17-generic N/A
linux-firmware 1.95
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 07/12/2011
dmi.bios.vendor: Hewlett-Packard
dmi.bios.version: 68DDU Ver. F.18
dmi.board.name: 30C0
dmi.board.vendor: Hewlett-Packard
dmi.board.version: KBC Version 71.2E
dmi.chassis.asset.tag: CNU82119NQ
dmi.chassis.type: 10
dmi.chassis.vendor: Hewlett-Packard
dmi.modalias:
dmi:bvnHewlett-Packard:bvr68DDUVer.F.18:bd07/12/2011:svnHewlett-Packard:pnHPCompaq6710b(KU234ES#ABV):pvrF.18:rvnHewlett-Packard:rn30C0:rvrKBCVersion71.2E:cvnHewlett-Packard:ct10:cvr:
dmi.product.name: HP Compaq 6710b (KU234ES#ABV)
dmi.product.version: F.18
dmi.sys.vendor: Hewlett-Packard
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug quantal running-unity
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https://bugs.launchpad.net/bugs/1074648
Title:
Plugging in-out AC adapter automatically sets backlight brightness
[12.10][HP-Compaq-6710b]
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