Page 1 of 3 123 LastLast
Results 1 to 10 of 26

Thread: Can't adjust brightness after upgrade

  1. #1
    Join Date
    Jan 2011
    Beans
    54
    Distro
    Ubuntu 13.04 Raring Ringtail

    Can't adjust brightness after upgrade

    I just upgraded and now I can't adjust brightness. I've tried changing my grub to:

    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 acpi_backlight=vendor"
    GRUB_CMDLINE_LINUX=""
    and

    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="acpi_backlight=vendor"
    That I've seen suggested. Any idea what to do?

  2. #2
    Join Date
    Jun 2005
    Location
    Toronto, Canada
    Beans
    Hidden!
    Distro
    Xubuntu 14.04 Trusty Tahr

    Re: Can't adjust brightness after upgrade

    Did you upgrade to raring (13.04)?

    What is the make and model of your computer?

    Perhaps post back your dmesg log file for review:
    Code:
    pastebinit /var/log/dmesg
    ...and post back the link that is generated.

  3. #3
    Join Date
    Jan 2011
    Beans
    54
    Distro
    Ubuntu 13.04 Raring Ringtail

    Re: Can't adjust brightness after upgrade

    Sorry about that. Yaah, I upgraded to 13.04. I have a Gateway NV55C , and here's the link: http://paste.ubuntu.com/5607130/

  4. #4
    Join Date
    Jun 2005
    Location
    Toronto, Canada
    Beans
    Hidden!
    Distro
    Xubuntu 14.04 Trusty Tahr

    Re: Can't adjust brightness after upgrade

    When you say that you can't adjust brightness, do you mean via the FN+ brightness keys? If so, it would be interesting to see whether its the brightness that doesn't work, or the function keys. Try this.

    The following command will identify your backlight interfaces and their current values:
    Code:
    grep . /sys/class/backlight/*/*
    ...and you should see something like this:
    $ grep . /sys/class/backlight/*/*
    /sys/class/backlight/intel_backlight/actual_brightness:1044
    /sys/class/backlight/intel_backlight/bl_power:0
    /sys/class/backlight/intel_backlight/brightness:1044
    grep: /sys/class/backlight/intel_backlight/device: Is a directory
    /sys/class/backlight/intel_backlight/max_brightness:3484
    grep: /sys/class/backlight/intel_backlight/power: Is a directory
    grep: /sys/class/backlight/intel_backlight/subsystem: Is a directory
    /sys/class/backlight/intel_backlight/type:raw
    "brightness" is the current brightness value. "max_brightness" is the maximum value that your backlight interface can handle. Try manually changing the brightness value to see if the brightness changes:
    Code:
    echo XX | sudo tee /sys/class/backlight/YY/brightness
    ...where XX is a value between 0 and "max_brightness" and YY is the backlight interface directory (in my case, intel_backlight).

    You might also want to try some other kernel parameters. First, try without acpi_backlight=vendor:
    Code:
    GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
    GRUB_CMDLINE_LINUX=""
    Then try the following combinations:
    Code:
    GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
    GRUB_CMDLINE_LINUX="acpi_osi=Linux acpi_backlight=vendor"
    Code:
    GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
    GRUB_CMDLINE_LINUX="acpi_osi="
    Code:
    GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
    GRUB_CMDLINE_LINUX="acpi_osi=\"!Windows 2012\""
    Make sure to run:
    Code:
    sudo update-grub
    ...after each change to /etc/default/grub and rebooting.

  5. #5
    Join Date
    Jan 2011
    Beans
    54
    Distro
    Ubuntu 13.04 Raring Ringtail

    Re: Can't adjust brightness after upgrade

    Ok, so these worked:

    Code:
    GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
    GRUB_CMDLINE_LINUX="acpi_osi=Linux acpi_backlight=vendor"
    Code:
    GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
    GRUB_CMDLINE_LINUX="acpi_osi="
    But it only works with the Fn keys. If I use the slider on System Settings, it wont adjust.

    I didn't understand much of the
    Code:
    grep . /sys/class/backlight/*/*
    So I'll include it, hopefully you'll understand more of it.

    Code:
    maxo@Dayman:~$ grep . /sys/class/backlight/*/*
    /sys/class/backlight/acpi_video0/actual_brightness:9
    /sys/class/backlight/acpi_video0/bl_power:0
    /sys/class/backlight/acpi_video0/brightness:9
    grep: /sys/class/backlight/acpi_video0/device: Is a directory
    /sys/class/backlight/acpi_video0/max_brightness:9
    grep: /sys/class/backlight/acpi_video0/power: Is a directory
    grep: /sys/class/backlight/acpi_video0/subsystem: Is a directory
    /sys/class/backlight/acpi_video0/type:firmware
    /sys/class/backlight/intel_backlight/actual_brightness:976
    /sys/class/backlight/intel_backlight/bl_power:0
    /sys/class/backlight/intel_backlight/brightness:976
    grep: /sys/class/backlight/intel_backlight/device: Is a directory
    /sys/class/backlight/intel_backlight/max_brightness:976
    grep: /sys/class/backlight/intel_backlight/power: Is a directory
    grep: /sys/class/backlight/intel_backlight/subsystem: Is a directory
    /sys/class/backlight/intel_backlight/type:raw
    Edit: Using the Fn Keys, you can only adjust it a little, like from full brightness to about half.
    Last edited by ohmy28; April 27th, 2013 at 04:55 PM. Reason: More info

  6. #6
    Join Date
    Jun 2005
    Location
    Toronto, Canada
    Beans
    Hidden!
    Distro
    Xubuntu 14.04 Trusty Tahr

    Re: Can't adjust brightness after upgrade

    maxo@Dayman:~$ grep . /sys/class/backlight/*/*
    /sys/class/backlight/acpi_video0/actual_brightness:9
    /sys/class/backlight/acpi_video0/bl_power:0
    /sys/class/backlight/acpi_video0/brightness:9
    grep: /sys/class/backlight/acpi_video0/device: Is a directory
    /sys/class/backlight/acpi_video0/max_brightness:9
    grep: /sys/class/backlight/acpi_video0/power: Is a directory
    grep: /sys/class/backlight/acpi_video0/subsystem: Is a directory
    /sys/class/backlight/acpi_video0/type:firmware
    /sys/class/backlight/intel_backlight/actual_brightness:976
    /sys/class/backlight/intel_backlight/bl_power:0
    /sys/class/backlight/intel_backlight/brightness:976
    grep: /sys/class/backlight/intel_backlight/device: Is a directory
    /sys/class/backlight/intel_backlight/max_brightness:976
    grep: /sys/class/backlight/intel_backlight/power: Is a directory
    grep: /sys/class/backlight/intel_backlight/subsystem: Is a directory
    /sys/class/backlight/intel_backlight/type:raw
    You have 2 backlight interfaces (intel_backlight and acpi_video0). Do any of those kernel boot parameters result in only one backlight interface? Maybe you could also try:
    Code:
    GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
    GRUB_CMDLINE_LINUX="acpi_osi=Linux"
    Code:
    GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
    GRUB_CMDLINE_LINUX="acpi_osi= acpi_backlight=vendor"
    Code:
    GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
    GRUB_CMDLINE_LINUX="acpi_osi='!Windows 2012'"
    Last edited by Toz; April 27th, 2013 at 10:28 PM.

  7. #7
    Join Date
    Jan 2011
    Beans
    54
    Distro
    Ubuntu 13.04 Raring Ringtail

    Re: Can't adjust brightness after upgrade

    None of the boot parameters resulted in just one interface. But,
    GRUB_CMDLINE_LINUX_DEFAULT="quiet splash" GRUB_CMDLINE_LINUX="acpi_osi='!Windows 2012'"
    Made it so I wasn't able to change brightness. To add something else, with the other parameters when I adjust with the Fn Keys, the brightness bubble you get on the top right of your screen doesn't appear, but with the one that doesn't allow me to change brightness it does.

  8. #8
    Join Date
    Jun 2005
    Location
    Toronto, Canada
    Beans
    Hidden!
    Distro
    Xubuntu 14.04 Trusty Tahr

    Re: Can't adjust brightness after upgrade

    On a hunch....

    Code:
    GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
    GRUB_CMDLINE_LINUX="acpi_osi='!Windows 2012' acpi_backlight=vendor"

  9. #9
    Join Date
    Jan 2011
    Beans
    54
    Distro
    Ubuntu 13.04 Raring Ringtail

    Re: Can't adjust brightness after upgrade

    No luck

  10. #10
    Join Date
    Jun 2005
    Location
    Toronto, Canada
    Beans
    Hidden!
    Distro
    Xubuntu 14.04 Trusty Tahr

    Re: Can't adjust brightness after upgrade

    Quote Originally Posted by ohmy28 View Post
    Ok, so these worked:

    Code:
    GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
    GRUB_CMDLINE_LINUX="acpi_osi=Linux acpi_backlight=vendor"
    Code:
    GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
    GRUB_CMDLINE_LINUX="acpi_osi="
    But it only works with the Fn keys. If I use the slider on System Settings, it wont adjust.
    Looks like these are the ones that work best. Might be a good idea to create a bug report.

Page 1 of 3 123 LastLast

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •