My machine: DELL Inspiron 3521 Processor I3 Video Intel HD4000 - Ubuntu 12.04.3 x64 with the latest update on date 2013-12-31
Without any change to grub, isn't possible to change the brightness (The buttons respond but I can only adjust brightness one step down from maximum setting and back). Whith the change into grub: GRUB_CMDLINE_LINUX="acpi_backlight=vendor", the matter seems resolved, but in many cases, during the adjustement of brightness, the system freeze. Thanks -- You received this bug notification because you are a member of DX Packages, which is subscribed to unity in Ubuntu. Matching subscriptions: dx-packages https://bugs.launchpad.net/bugs/1181512 Title: Cannot adjust screen brightness Status in Unity: Invalid Status in “unity” package in Ubuntu: Invalid Bug description: 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 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 SourcePackage: unity UpgradeStatus: Upgraded to raring on 2013-05-15 (2 days ago) To manage notifications about this bug go to: https://bugs.launchpad.net/unity/+bug/1181512/+subscriptions -- Mailing list: https://launchpad.net/~dx-packages Post to : dx-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~dx-packages More help : https://help.launchpad.net/ListHelp
