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Thread: Can't change brightness Ubuntu 13

  1. #1
    Join Date
    Dec 2012
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    33

    Can't change brightness Ubuntu 13

    I recently updated to ubuntu 13.04 and needed to change the brightness because i was getting a blank screen on login. FN+UP temporarily fixed this.

    i entered the following in /etc/default/grub

    Code:
    GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_osi=linux acpi_backlight=vendor"
    and that fixed the blank screen problem but now i can change the brightness. how can i make it so i can change the brightness settings again?
    Last edited by Heinzelmannchen; May 30th, 2013 at 01:31 AM.

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

    Re: Can't change brightness Ubuntu 13

    What is the make/model of your computer and what video card(s) and drivers do you have? This might help:
    Code:
    sudo lspci -vnn | grep -A12 VGA
    (Stab in the dark) You might want to try:
    Code:
    GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_osi=\"!Windows 2012\""
    ...instead of "acpi_osi=linux acpi_backlight=vendor". It seems to be a valid workaround for newer devices. As a reminder, make sure you run "sudo update-grub" afterwards to commit the change to grub.

  3. #3
    Join Date
    Dec 2012
    Beans
    33

    Re: Can't change brightness Ubuntu 13

    Quote Originally Posted by Toz View Post
    What is the make/model of your computer and what video card(s) and drivers do you have? This might help:
    Code:
    sudo lspci -vnn | grep -A12 VGA
    (Stab in the dark) You might want to try:
    Code:
    GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_osi=\"!Windows 2012\""
    ...instead of "acpi_osi=linux acpi_backlight=vendor". It seems to be a valid workaround for newer devices. As a reminder, make sure you run "sudo update-grub" afterwards to commit the change to grub.
    Sorry about that. I have lenovo g580

    here is
    Code:
    sudo lspci -vnn | grep -A12 VGA

    00:02.0 VGA compatible controller [0300]: Intel Corporation 3rd Gen Core processor Graphics Controller [8086:0166] (rev 09) (prog-if 00 [VGA controller])
    Subsystem: Lenovo Device [17aa:3977]
    Flags: bus master, fast devsel, latency 0, IRQ 44
    Memory at e0000000 (64-bit, non-prefetchable) [size=4M]
    Memory at d0000000 (64-bit, prefetchable) [size=256M]
    I/O ports at 3000 [size=64]
    Expansion ROM at <unassigned> [disabled]
    Capabilities: [90] MSI: Enable+ Count=1/1 Maskable- 64bit-
    Capabilities: [d0] Power Management version 2
    Capabilities: [a4] PCI Advanced Features
    Kernel driver in use: i915

    00:14.0 USB controller [0c03]: Intel Corporation 7 Series/C210 Series Chipset Family USB xHCI Host Controller [8086:1e31] (rev 04) (prog-if 30 [XHCI])

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

    Re: Can't change brightness Ubuntu 13

    Did you try the acpi_osi=\"!Windows 2012\" kernel boot parameter?

  5. #5
    Join Date
    Dec 2012
    Beans
    33

    Re: Can't change brightness Ubuntu 13

    Yes i tried entering that then updated grub. After restarting i'm still not able to change brightness.

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

    Re: Can't change brightness Ubuntu 13

    Can you post back the results of:
    Code:
    cat /proc/cmdline
    ...after booting with the acpi_osi=\"!Windows 2012\" kernel boot parameter?

    Also, can you post back the contents of your dmesg log file like this:
    Code:
    pastebinit /var/log/dmesg
    ...and post back the link that is generated.

    You might also want to try each of the existing ones separately:
    Code:
    GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_osi=Linux"
    Code:
    GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=vendor"

  7. #7
    Join Date
    Dec 2012
    Beans
    33

    Re: Can't change brightness Ubuntu 13

    Code:
    cat /proc/cmdline
    BOOT_IMAGE=/boot/vmlinuz-3.8.0-22-generic root=UUID=37d6764d-d42f-4b4b-a693-7579383559fb ro quiet splash acpi_osi=linux acpi_backlight=vendor vt.handoff=7


    Pastebin

  8. #8
    Join Date
    Dec 2012
    Beans
    33

    Smile Re: Can't change brightness Ubuntu 13

    The following works
    Code:
    GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_osi=Linux"
    Thanks for the support. I always feel so dumb when i can't figure this stuff out on my own.
    I couldn't find much on the subject when searching, maybe i didn't look hard enough. Oh well i really appreciate your help =).

  9. #9
    Join Date
    Aug 2013
    Beans
    2

    Re: Can't change brightness Ubuntu 13

    I confirm that on a Acer Aspire V5-171 (Intel 3rd generation i915), the above statement got the brightness controls working again.

    Ubuntu 13.10 x64
    Kernel: 3.11.6

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