you need to edit your grub file
run these command in terminal
sudo nano /etc/default/grub
change
GRUB_CMDLINE_LINUX=""acpi_backlight=vendor
to
GRUB_CMDLINE_LINUX="acpi_backlight=vendor"
save it and run
sudo update-grub
** Changed in: unity (Ubuntu)
Status: New => Invalid
** Description changed:
Dell Inspiron 15 (3521) i5 64bit laptop
With Ubuntu 12.04 and 12.10, the Dell Laptop would allow me to change
screen brightness using Fn+F4 (brightness down) and Fn+F5 (brightness
up).
After upgrading to 13.10, the buttons respond but I can only adjust
brightness one step down from maximum setting and back.
System Settings > Brightness and Lock - does not allow me to change the
brightness setting at all. Screen dimming to save power occurs if I
enable it.
ProblemType: Bug
DistroRelease: Ubuntu 13.04
Package: unity 7.0.0daily13.04.18~13.04-0ubuntu1
ProcVersionSignature: Ubuntu 3.8.0-22.33-generic 3.8.11
Uname: Linux 3.8.0-22-generic x86_64
ApportVersion: 2.9.2-0ubuntu8
Architecture: amd64
CompizPlugins:
[core,composite,opengl,compiztoolbox,decor,vpswitch,snap,mousepoll,resize,place,move,wall,grid,regex,imgpng,session,gnomecompat,animation,fade,unitymtgrabhandles,workarounds,scale,expo,ezoom,unityshell]
Date: Sat May 18 17:16:40 2013
DistributionChannelDescriptor:
- # This is a distribution channel descriptor
- # For more information see
http://wiki.ubuntu.com/DistributionChannelDescriptor
- canonical-oem-somerville-precise-amd64-20120703-2
+ # This is a distribution channel descriptor
+ # For more information see
http://wiki.ubuntu.com/DistributionChannelDescriptor
+ canonical-oem-somerville-precise-amd64-20120703-2
EcryptfsInUse: Yes
InstallationDate: Installed on 2013-03-12 (66 days ago)
InstallationMedia: Ubuntu 12.04 "Precise" - Build amd64 LIVE Binary
20120703-15:08
MarkForUpload: True
ProcEnviron:
- TERM=xterm
- PATH=(custom, no user)
- XDG_RUNTIME_DIR=<set>
- LANG=en_US.UTF-8
- SHELL=/bin/bash
+ TERM=xterm
+ PATH=(custom, no user)
+ XDG_RUNTIME_DIR=<set>
+ LANG=en_US.UTF-8
+ SHELL=/bin/bash
SourcePackage: unity
UpgradeStatus: Upgraded to raring on 2013-05-15 (2 days ago)
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https://bugs.launchpad.net/bugs/1181512
Title:
Cannot adjust screen brightness
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