Public bug reported: Changes on the backlight do not have effect. Only possibility to change the backlight is to boot OS X, change the backlight there and boot back into Ubuntu.
The bug is also discribed here: https://forum.ubuntuusers.de/topic /helligkeit-anpassen/ (german Website) I followed this guide to produce the bug-report: https://wiki.ubuntu.com/Kernel/Debugging/Backlight On this website the problem I have is also discribed: "Backlight control does not work, but there are entries in /sys/class/backlight. This may require the ACPI backlight driver to not take control so that a vendor specific driver will have a chance to register (see below)." Kind regards Jojo ProblemType: Bug DistroRelease: Ubuntu 14.04 Package: linux-image-3.19.0-51-generic 3.19.0-51.58~14.04.1 ProcVersionSignature: Ubuntu 3.19.0-51.58~14.04.1-generic 3.19.8-ckt13 Uname: Linux 3.19.0-51-generic x86_64 NonfreeKernelModules: fglrx ApportVersion: 2.14.1-0ubuntu3.19 Architecture: amd64 CurrentDesktop: Unity Date: Mon Mar 7 16:09:37 2016 InstallationDate: Installed on 2016-02-22 (14 days ago) InstallationMedia: Ubuntu 14.04.3 LTS "Trusty Tahr" - Beta amd64 (20150805) SourcePackage: linux-lts-vivid UpgradeStatus: No upgrade log present (probably fresh install) ** Affects: linux-lts-vivid (Ubuntu) Importance: Undecided Status: New ** Tags: amd64 apport-bug trusty ** Attachment added: "backlight" https://bugs.launchpad.net/bugs/1554089/+attachment/4591649/+files/backlight -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1554089 Title: backlight can not be changed on iMac To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux-lts-vivid/+bug/1554089/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
