Update on Ubuntu 11.10 (Oneiric) Hi there, just a quick update on screen brightness issue status, for the Vaio Y series. The problem seems related to gnome-power-manager & intel 915 driver... Kamal Mostafa has released a path that should be already present in Ubuntu 11.10. I don't know if this due to the Kamal patch (but I think so), but now it is possible to control our (sony Y) brightness through: /sys/class/backlight/intel_backlight/brightness
Anyway, the gnome-power-manager links to /sys/class/backlight/acpi_video0/ in order to read/set backlight. Unfortunately, this control is completely void and does not produce any effect. A suggested workaround is to start linux with boot parameter: acpi_backlight=vendor This produce the desired effect: /sys/class/backlight/acpi_video0/ disappears, BUT the sony_laptop module, as does not found acpi support to brightness, takes in care brightness management creating its own sony brightness device... and yes, gnome-power-manager prefers it than our beloved intel_backlight. Unfortunately, we NEED sony_laptop module, because takes care of the fn keys bindings. So, two ways are available: 1) modify and recompile sony_laptop module in order to ignore brightness control + acpi_backlight=vendor on boot 2) The old and still pretty good acpi event management through custom scripts Solution 2 is easier and less intrusive, so I have updated the brightness scripts, in order to adopt the new brightness control interface and sync with the "void" acpi_video0 control when pressing brightness up and down keys. The install script is now a little smarter, doing checks in order to prevent installation where not needed. I leave here a copy of the patch, hoping could be of help Cheers Francesco ** Attachment added: "sonyY_patch3.tar.gz" https://bugs.launchpad.net/ubuntu/+source/gnome-power-manager/+bug/524967/+attachment/2733058/+files/sonyY_patch3.tar.gz -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to gnome-power-manager in Ubuntu. https://bugs.launchpad.net/bugs/524967 Title: Screen brightness doesn't work on Vaio Y Status in “gnome-power-manager” package in Ubuntu: In Progress Bug description: Binary package hint: acpi-support On a Sony Vaio VPCY115FX (Y series) with the Intel Corporation Mobile 4 Series Chipset Integrated Graphics Controller (Mobile Intel GS45 Express Chipset) running Karmic 64-bit, the screen brightness control doesn't work, although the Fn keys seem to be sending the right signals (and also being correctly interpreted by Gnome). The output of acpi_listen is sony/hotkey SNC 00000001 00000011 (Fn+F6 struck - brightness +) sony/hotkey SNC 00000001 0000003b (Fn+F6 released) sony/hotkey SNC 00000001 00000010 (Fn+F5 struck - brightness -) sony/hotkey SNC 00000001 0000003b (Fn+F5 released) I have tried the following procedures, with no effect. - http://ubuntuforums.org/showthread.php?p=2877962 - http://ubuntuforums.org/showthread.php?t=733322 This problem has also been reported for previous and current versions of Ubuntu, on different Vaio laptops with different graphic cards. - http://ubuntuforums.org/showthread.php?t=1404806 ProblemType: Bug Architecture: amd64 Date: Sat Feb 20 14:54:25 2010 DistroRelease: Ubuntu 9.10 InstallationMedia: Ubuntu 9.10 "Karmic Koala" - Release amd64 (20091027) Package: acpi-support 0.129 ProcEnviron: LANGUAGE=pt_BR.UTF-8 LANG=pt_BR.UTF-8 SHELL=/bin/bash ProcVersionSignature: Ubuntu 2.6.31-19.56-generic SourcePackage: acpi-support Uname: Linux 2.6.31-19-generic x86_64 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-power-manager/+bug/524967/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
