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Thread: Notebook Asus N750JV-T4069H: Keyboard Backlight And All Fn Keys

  1. #1
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    Notebook Asus N750JV-T4069H: Keyboard Backlight And All Fn Keys

    Hi all,
    happy with 7 months Linux experience on old HP desktop, few days ago I deleted Windows from my brand new notebook Asus N750JV-T4069H (Intel® Core™ i7-4700HQ; Bit 64; Nvidia GeForce GT750M) and installed Xubuntu 13.10. I'm not sure but it seems to me that my problem is Xubuntu bug. If this is the case, I would be very grateful if someone can communicate the problem to the development team 'cause I get lost inside the more than complicated bug reporting procedure:


    - Keyboard backlight and all the function keys (fn) are not working
    (i can turn on keyboard backlight with
    sudo chmod 777 /sys/class/leds/asus::kbd_backlight/brightness
    echo 3 > /sys/class/leds/asus::kbd_backlight/brightness
    but effect is lost after turning the computer off and on again).

  2. #2
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    Re: Notebook Asus N750JV-T4069H: Keyboard Backlight And All Fn Keys

    There is some interesting information at this link that you might find helpful. The author has found that the kernel parameter acpi= seems to solve issue with brightness keys.

  3. #3
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    Re: Notebook Asus N750JV-T4069H: Keyboard Backlight And All Fn Keys

    ORIGINAL /etc/default/grub


    GRUB_DEFAULT=0
    GRUB_HIDDEN_TIMEOUT=0
    GRUB_HIDDEN_TIMEOUT_QUIET=true
    GRUB_TIMEOUT=10
    GRUB_DISTRIBUTOR=`lsb_release -i -s 2> /dev/null || echo Debian`
    GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
    GRUB_CMDLINE_LINUX=""


    Thanks for reply
    I've tried 4 different scenarios, but nothing changes:


    GRUB_CMDLINE_LINUX="acpi= nolapic. 'acpi='"
    GRUB_CMDLINE_LINUX="'acpi='"
    GRUB_CMDLINE_LINUX=acpi= nolapic. 'acpi='
    GRUB_CMDLINE_LINUX='acpi='

  4. #4
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    Re: Notebook Asus N750JV-T4069H: Keyboard Backlight And All Fn Keys

    Try:
    Code:
    GRUB_CMDLINE_LINUX="acpi="
    ...and after you've saved the file, make sure to run:
    Code:
    sudo update-grub
    On reboot, check with:
    Code:
    cat /proc/cmdline

  5. #5
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    Re: Notebook Asus N750JV-T4069H: Keyboard Backlight And All Fn Keys

    I have reinstalled Xubuntu once again. Don't know if it is of any importance, but in my computer ther'e no a single trace of Windows 8 (uefi/boot).

    Nothing changes with different acpi= kernel parameter.
    Please explain (step by step) what do you mean with:


    On reboot, check with:
    Code:
    cat /proc/cmdline

  6. #6
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    Re: Notebook Asus N750JV-T4069H: Keyboard Backlight And All Fn Keys

    Hi,
    thank you once again for your assistance.
    "acpi=" and "acpi_osi=\"!Windows 2012\"" are useless, but with "acpi_osi=" we're almost there


    GRUB_CMDLINE_LINUX="acpi_osi="


    pastebinit /var/log/dmesg


    http://paste.ubuntu.com/6488928/
    cat /proc/cmdline


    BOOT_IMAGE=/boot/vmlinuz-3.11.0-13-generic.efi.signed root=UUID=737be188-c475-4521-a764-c484a80d404c ro acpi_osi= quiet splash vt.handoff=7
    NOT OK:
    Power Adapter shows not connected
    No keyboard backlightng
    FN (F3) Decreases keyboard backlighting
    FN (F4) Increases keyboard backlighting
    FN (F9) Enables or disables the touchpad


    OK:
    Battery shows 100%
    FN (F1) Puts the Notebook PC into Sleep mode
    FN (F2) Turns Airplane mode on or off
    FN (F5) Decreases display brightness
    FN (F6) Increases display brightness
    FN (F7) Turns the display panel off
    FN (F8) Activates the second screen
    FN (F10) Turns the speaker on or off
    FN (F11) Turns the speaker volume down
    FN (F12) Turns the speaker volume up

  7. #7
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    Re: Notebook Asus N750JV-T4069H: Keyboard Backlight And All Fn Keys

    [ 0.304692] ACPI Error: Method parse/execution failed [\_SB_.BTKL._STA] (Node ffff8804188ce7a8), AE_NOT_FOUND (20130517/psparse-536)
    ...looks like "acpi_osi=" is causing issues with the power handling on your system.

    Can you the try "acpi_osi=\"!Windows 2012\"" kernel parameter again and this time post back the dmesg log file? Also post back what works and what doesn't. Lets compare. The relevant lines in /etc/default/grub should look like:
    Code:
    GRUB_CMDLINE_LINUX_DEFAULT="quiet rw"
    GRUB_CMDLINE_LINUX="acpi_osi=\"!Windows 2012\""
    Last edited by Toz; November 28th, 2013 at 12:53 PM.

  8. #8
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    Re: Notebook Asus N750JV-T4069H: Keyboard Backlight And All Fn Keys

    GRUB_CMDLINE_LINUX_DEFAULT="quiet rw"
    GRUB_CMDLINE_LINUX="acpi_osi=\"!Windows 2012\""

    pastebinit /var/log/dmesg

    http://paste.ubuntu.com/6489491/
    cat /proc/cmdline

    BOOT_IMAGE=/boot/vmlinuz-3.11.0-13-generic.efi.signed root=UUID=737be188-c475-4521-a764-c484a80d404c ro "acpi_osi=!Windows 2012" quiet rw
    NOT OK:
    Power Adapter shows not connected
    No keyboard backlightng
    FN (F3) Decreases keyboard backlighting
    FN (F4) Increases keyboard backlighting
    FN (F9) Enables or disables the touchpad
    FN (F5) Decreases display brightness
    FN (F6) Increases display brightness
    FN (F10) Turns the speaker on or off / FN (F11) Turns the speaker volume down / FN (F12) Turns the speaker volume up (sometimes yes, sometimes no, sometimes strange opening of browser or text editor menu)
    FN (F1) Puts the Notebook PC into Sleep mode (notebook returns from sleep mode with broken screen and strange vertical colour lines

    OK:
    Battery shows 100%
    FN (F7) Turns the display panel off
    FN (F8) Activates the second screen
    FN (F2) Turns Airplane mode on or off

    During startup now appears a new strange process, and later I have system internal error (cannot copy/paste, please see attached images)-

    GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
    GRUB_CMDLINE_LINUX="acpi_osi=\"!Windows 2012\""

    pastebinit /var/log/dmesg

    http://paste.ubuntu.com/6489580/
    cat /proc/cmdline

    BOOT_IMAGE=/boot/vmlinuz-3.11.0-13-generic.efi.signed root=UUID=737be188-c475-4521-a764-c484a80d404c ro "acpi_osi=!Windows 2012" quiet splash vt.handoff=7
    NOT OK:
    Power Adapter shows not connected
    No keyboard backlightng
    FN (F3) Decreases keyboard backlighting
    FN (F4) Increases keyboard backlighting
    FN (F9) Enables or disables the touchpad
    FN (F5) Decreases display brightness
    FN (F6) Increases display brightness

    OK:
    Battery shows 100%
    FN (F1) Puts the Notebook PC into Sleep mode
    FN (F2) Turns Airplane mode on or off
    FN (F7) Turns the display panel off
    FN (F8) Activates the second screen
    FN (F10) Turns the speaker on or off
    FN (F11) Turns the speaker volume down
    FN (F12) Turns the speaker volume up
    Attached Images Attached Images

  9. #9
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    Re: Notebook Asus N750JV-T4069H: Keyboard Backlight And All Fn Keys

    Okay, so it looks like acpi_osi= is your best bet. Can you see if there is a bios update available for your computer that might solve the power issue for you?

  10. #10
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    Re: Notebook Asus N750JV-T4069H: Keyboard Backlight And All Fn Keys

    In future, if any update available, which system should I choose:

    Windows 8.1 64bit
    Windows 8 64bit
    Others

    BIOS 207
    2013.08.29 update
    http://support.asus.com/download.asp...tr8rGDPtaGjY1O

    My bios:

    sudo dmidecode -s bios-version

    N750JV.207
    What do you propose, not only for power issue but also for keyboard backlighting problem? Should I contact directly official Asus support? Before doing so, is there a way we can easily check if some other problem exist on relation notebook-operating system?

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