Hello Christopher. Sorry for the delay. I am having problems downloading the daily images but I trusted with Alpha 2, and the bug persists there.
And I did not test the mainline kernels since as noted earlier, even with the Saucy kernel, if we directly write to /sys/class/backlight/intel_backlight/brightness then the brightness does change, so even the default Saucy kernel is clearly capable of telling the hardware to change its brightness. The problem lies probably in that the GUI as in the power management applet popup and the keyboard hook which should handle the pressing of the physical brightness keys on keyboard are somehow not able to modify the /sys/class/backlight/* file or so. With the existing setup, I have having to sudo to modify the /sys/class/* file, so perhaps the process running the GUI popup or the keyboard hook does not have the relevant permissions to change the /sys/class/* file. -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1255428 Title: LCD brightness control keys and widget do not work on Intel Graphics on Saucy Status in “linux” package in Ubuntu: Confirmed Bug description: After upgrading to Saucy, on my Lenovo IdeaPad Z570 with Intel HD Graphics 3000, it is no longer possible to control the LCD brightness using the hardware brightness control keys. Likewise for the KDE power management settings or the battery icon on my Kubuntu Plasma tray. (I don't use GNOME/Unity.) Until Raring I did not have this problem. There is a workaround available from http://askubuntu.com/questions/362894/changing-the-brightness-stopped- working-in-13-10-saucy-salamander i.e. doing the following command on a terminal: echo 150 | sudo tee /sys/class/backlight/intel_backlight/brightness where 150 is on the scale of 0 to whatever is given within /sys/class/backlight/intel_backlight/max_brightness. Based on this I wrote a GUI which however needs to be run using sudo/kdesudo/gksudo. I have attached it. Bug #1241745 also relates to the same problem on Saucy but apparently relates to an NVidia driver and I was asked to track this as a separate bug https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1241745/comments/17 --- ApportVersion: 2.12.5-0ubuntu2.1 Architecture: amd64 DistroRelease: Ubuntu 13.10 InstallationDate: Installed on 2013-10-19 (38 days ago) InstallationMedia: Kubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1) MarkForUpload: True Package: xserver-xorg-video-intel 2:2.99.904-0ubuntu2 PackageArchitecture: amd64 ProcVersionSignature: Ubuntu 3.11.0-13.20-generic 3.11.6 Tags: saucy Uname: Linux 3.11.0-13-generic x86_64 UpgradeStatus: No upgrade log present (probably fresh install) UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1255428/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp