after adding "acpi_backlight=vendor" to grub the hotkey works fine, but the brightness level indicator won't pop-out and the Brightness applet become not working at all, brightness won't change when you try to adjust it.
Debuggung information: $ ls /sys/class/backlight intel_backlight thinkpad_screen # ls -la /sys/class/backlight/intel_backlight lrwxrwxrwx 1 root root 0 Nov 26 04:54 /sys/class/backlight/intel_backlight -> ../../devices/pci0000:00/0000:00:02.0/drm/card0/card0-LVDS-1/intel_backlight Brightness will change to very low with echo 8 > /sys/class/backlight/intel_backlight/brightness -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1255014 Title: [Lenovo V480] Unable to control the brightness from Max - Min To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux-lts-raring/+bug/1255014/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
