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Thread: Cannot adjust screen brightness

  1. #11
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    Re: Cannot adjust screen brightness

    Okay try this. Blacklist the asus_nb_wmi kernel module and reboot.

    See if you have the brightness slider again and whether it works.

    Try the function keys. (I have a feeling they won't work and we'll need to consider a workaround).

    As for the headphones, that kernel parameter would have no effect on the headphones. I think its just a coincidence that they stopped working then. Double-check to make sure that the headphones are not muted when they are plugged in. If possible, log in as guest and try the headphones there. If they don't work, its indicative of a system issue. If they do work, then there is something wrong with your profile.

  2. #12
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    Re: Cannot adjust screen brightness

    I tried to blacklist asus_nb_wmi, but I get this message in the terminal when I try to save: [ Error writing /etc/modprobe.d/blacklist: Permission denied ] . I tried to do the same thing again from this command,
    sudo nano -w /etc/modprobe.d/blacklist

    but I got the same error message again. The headphones are not muted when plugged in, and they still do not work when I am using a Guest account. They do work in Windows 8 though.

  3. #13
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    Re: Cannot adjust screen brightness

    Try this instead:
    Code:
    gksudo gedit /etc/modprobe.d/blacklist
    ...if you get an error that gksudo command is not found, then try:
    Code:
    sudo -i gedit /etc/modprobe.d/blacklist

  4. #14
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    Oct 2014
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    Re: Cannot adjust screen brightness

    I was able to add asus_nb_wmi to /etc/modprobe.d/blacklist, but after rebooting, the function keys still do not work. The brightness slider is still there though.

  5. #15
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    Re: Cannot adjust screen brightness

    The proper way to fix this is to create a bug report against the linux kernel so that this module can get fixed.

    All we can do now is workarounds to get around the issue. If you want, we can try to assign commands to the function keys to get them to change brightness. If you want to do this, can you tell me if the following commands adjust brightness:
    Code:
    xbacklight -inc 10%
    xbacklight -dec 10%
    If they do, simply assign those commands as keyboard shortcuts to the function key combinations. I don't use unity so I'm not sure exactly where the utility is for setting these shortcuts. Try searching for "keyboard" in the dash.

  6. #16
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    Re: Cannot adjust screen brightness

    Those commands do not adjust the brightness. How do I create a bug report, and which kernel is it that I should report?

  7. #17
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    Re: Cannot adjust screen brightness

    Quote Originally Posted by paul_b4 View Post
    Those commands do not adjust the brightness.
    What does the following return now:
    Code:
    for interface in /sys/class/backlight/*; do echo -e "\n $interface"; cat $interface/{brightness,max_brightness,actual_brightness}; done
    How do I create a bug report, and which kernel is it that I should report?
    To start the bug reporting process:
    Code:
    ubuntu-bug linux

  8. #18
    Join Date
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    Re: Cannot adjust screen brightness

    Entering
    for interface in /sys/class/backlight/*; do echo -e "\n $interface"; cat $interface/{brightness,max_brightness,actual_brightness}; donegives me this:

    /sys/class/backlight/asus-nb-wmi
    100
    100
    100

    /sys/class/backlight/intel_backlight
    7812
    7812
    7812

    I have submitted the bug report https://bugs.launchpad.net/ubuntu/+s...x/+bug/1389675 .

  9. #19
    Join Date
    Oct 2014
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    Re: Cannot adjust screen brightness

    This was my solution for my grafics adapter (NVIDIA GeForce 8400M G) but if you can figure out how it works with yours it might be good, too.

    sudo gedit /etc/X11/xorg.conf


    You will have to enter your root password.

    Now, you should see:

    __________________________________________________ _
    Section "Device"
    Identifier "Device0"
    Driver "nvidia"
    VendorName "NVIDIA Corporation"
    EndSection
    __________________________________________________ _

    If you see nothing, just enter all the lines above and follow up with the next step below

    Under the VendorName Line, add the following:

    __________________________________________________ ____
    Option "RegistryDwords" "EnableBrightnessControl=1"
    __________________________________________________ ____

    Now, save and reboot. Check your brightness controls, and hopefully this fixed things.

    I've tried so many solutions out of the net and nothing had helped me until I came to this solution. But be aware that these steps only working for NVIDIA Grafics and you must have chosen the NVIDIA Driver in your system in "Administration -> Driver Manager"

    I've posted this answer very often now and I believe if you're able to figure out what you have to insert instead of NVIDIA it should work for the intel device as well. Or just try the line with the Option "RegistryDwords" ... maybe this will work, too but as I wrote above it was NVIDIA in my case. so no guarantee

  10. #20
    Join Date
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    Re: Cannot adjust screen brightness

    Quote Originally Posted by paul_b4 View Post
    Entering
    for interface in /sys/class/backlight/*; do echo -e "\n $interface"; cat $interface/{brightness,max_brightness,actual_brightness}; donegives me this:

    /sys/class/backlight/asus-nb-wmi
    100
    100
    100

    /sys/class/backlight/intel_backlight
    7812
    7812
    7812

    I have submitted the bug report https://bugs.launchpad.net/ubuntu/+s...x/+bug/1389675 .
    Can you post back the contents of /etc/modprobe.d/blacklist ?

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