After rereading everything and going over the provided data, It seems this isn't a kernel issue.
In the wiki article about debugging backlights (https://wiki.ubuntu.com/Kernel/Debugging/Backlight) the first bullet point says: Hotkeys change the brightness, but no OSD feedback and the brightness applet does not work. There is nothing that the kernel can do to resolve this situation. Since there is no vendor specific control mechanism and the generic ACPI interface is not defined (or not defined correctly), there is no way Linux can interact. In those cases the hotkeys are directly wired to the backlight control and no events are passed on to the OS. And it seems your hotkeys do work to change the brightness. I'm not sure if the info in this page will be helpful, but it is worth trying these suggestions: https://help.ubuntu.com/community/ScreenBacklight ** Changed in: linux (Ubuntu) Status: New => Invalid -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2076466 Title: I am unable to change the backlight on my ASUS PT2001 All In One computer To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2076466/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
