Lenovo E530: Hardware buttons doesn't adjust monitor brightness

[maxroby]

Pressing Brighness buttons on my Lenovo E530 doesn't adjust the monitor brightness, it remains at the lowest value. The notification appears and remain at the lowest level. Adjusting it from the settings - brighness works. Before the update to raring, buttons work fine in 12.10.

ProblemType: Bug
DistroRelease: Ubuntu 13.04
Package: gnome-control-center 1:3.6.3-0ubuntu16
ProcVersionSignature: Ubuntu 3.8.0-13.23-generic 3.8.3
Uname: Linux 3.8.0-13-generic x86_64
ApportVersion: 2.9.2-0ubuntu2
Architecture: amd64
Date: Fri Mar 22 11:48:53 2013
InstallationDate: Installed on 2013-01-29 (52 days ago)
InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Release amd64 (20121017.5)
MarkForUpload: True
ProcEnviron:
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=it_IT.UTF-8
 SHELL=/bin/bash
SourcePackage: gnome-control-center
UpgradeStatus: Upgraded to raring on 2013-03-20 (2 days ago)
usr_lib_gnome-control-center:
 activity-log-manager-control-center 0.9.4-0ubuntu6.1
 deja-dup 25.5-0ubuntu1
 gnome-control-center-signon 0.1.4-0ubuntu1
 gnome-control-center-unity 1.2daily13.02.15-0ubuntu1
 indicator-datetime 12.10.3daily13.03.07-0ubuntu1

[maxroby (maxroby)]

Partially solved adding "acpi_backlight=vendor" to /etc/default/grub:
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=vendor"
thanks to http://www.chimerarevo.com/ubuntu-tasti-fn-notebook-luminosita/
Only the indicator is still showing always the minimum value.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Nate (n8marti)]

I seem to have a similar issue on a Toshiba Portege R830, except neither the hardware shortcuts nor the Brighness adjuster in System Settings change the screen brightness. When using the hardware shortcuts and when adjusting through "Brightness and Lock" both slider bars register changes, but no change is seen.

[Tim Lennon (kontrolfreak)]

I have the same problem with my E530. Also, if I adjust the brightness through display settings, it does not remember them next time I boot.

It makes a significant difference to the battery life, so it would be great to get it corrected :-)

[Sicco van Sas (sicco)]

This bug affects my Lenovo E530 laptop as well. When pressing the backlight up/down fn keys the backlight is set to the minimum and can't be changed. The partial fix from comment #2 works (also with a malfunctioning indicator, which only jumps between 2 positions).

[jedib (divekind)]

Had the same issue on a Lenovo B590. Partial fix worked, but the indicator is not shown at all.

[tushar maroo (tusharmaroo)]

Same issue as stated by #6 , previously i was having dell studio 1558 in which also brightness has same bug, why can't anyone just work on it. If nobody is there, please guide me i will love to contribute. Thanks.

[Dave Gilbert (ubuntu-treblig)]

Triaging Low: Machine useable, possible workaround

Anyone who has this please try following the instructions in https://wiki.ubuntu.com/Kernel/Debugging/Backlight