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 Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/524967 Title: Screen brightness doesn't work on Vaio Y To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-power-manager/+bug/524967/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
