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Thread: Keyboard backlight no longer controllable via Fn keys within last week

  1. #1
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    Default Keyboard backlight no longer controllable via Fn keys within last week

    Keyboard backlight no longer controllable via Fn keys within last week. Can still control via slider in battery/power applet in system tray. This worked up until the last one or two dups (which I run weekly).

    ASUS G53SX
    Kernel 4.14.15-1-default (IIRC, did not work following upgrade to the one prior, either -- again within the last week)

    Has anyone else observed this? Any idea how to troubleshoot?

    Thanks.

  2. #2
    Join Date
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    Default Re: Keyboard backlight no longer controllable via Fn keys within last week

    Start by sharing these details...
    Code:
    /usr/sbin/hwinfo --gfxcard
    Code:
    ls -l /sys/class/backlight
    Code:
    cat /proc/cmdline
    If you can demonstrate that booting from an older kernel results in brightness keys working as expected (via Grub > Advance options...) then a bug report is probably the best course of action.
    Last edited by deano_ferrari; 28-Jan-2018 at 19:50.

  3. #3
    Join Date
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    Default Re: Keyboard backlight no longer controllable via Fn keys within last week

    Quote Originally Posted by naughtypine View Post
    Keyboard backlight no longer controllable via Fn keys within last week. Can still control via slider in battery/power applet in system tray. This worked up until the last one or two dups (which I run weekly).

    ASUS G53SX
    Not clear to me if you are referring to the Video screen backlight not working, or the backlight LEDs under the keyboard not being controllable through Fn+F3, Fn+F4.
    If the latter is the case, on a similar ASUS laptop I had to add an "acpi_osi= " including the trailing blank to the command line:
    Code:
    bruno@LT_B:~> cat /proc/cmdline
    BOOT_IMAGE=/boot/vmlinuz-4.4.104-39-default root=UUID=fe8f.... ro acpi_osi= resume=/dev/disk/by-uuid/a9... splash=silent quiet showopts
    bruno@LT_B:~>
    Tumbleweed Gnome on i7 4720HQ + Geforce GTX960M
    testing Leap 15.3

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