Backlight debugging as per link supplied by jpds. Backlight control does not work, but there are entries in /sys/class/backlight.
Debugging information collected and attached. Testing for work around: After reboot with only the kernel parameter acpi_backlight=vendor: The function keys (hotkeys) have no effect (i.e do not change brightness or cause the brightness indicator to appear) but the Brightness slider in the Brightness & Lock settings dialogue does change the screen brightness. Command ls /sys/class/backlight > vendorbacklight was executed There is a folder /sys/class/backlight/intel_backlight/ Command ls -la /sys/class/backlight/intel_backlight/ > lslabacklight was executed Command echo 8 > /sys/class/backlight/intel_backlight/brightness executed causing the screen brightnes to change to very dim. After reboot with only the kernel parameter video.use_bios_initial_backlight=0 : The function keys (hotkeys) do not change brightness but they do cause the brightness indicator to appear and move. The Brightness slider in the Brightness & Lock settings dialogue *does* change the screen brightness. Kernel is 3.13.0-24-generic. After reboot with only the kernel parameter video.use_native_backlight=1 : The function keys (hotkeys) do not change brightness but they do cause the brightness indicator to appear and move. The Brightness slider in the Brightness & Lock settings dialogue does not change the screen brightness. ** Attachment added: "acpi" https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1311297/+attachment/4095598/+files/acpi -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1311297 Title: Screen brightness cannot be adjusted on ASUS Eeepc 1015PEM To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1311297/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
