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Thread: Acer/Ivybridge vs Screen Brightness

  1. #11
    Join Date
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    Ubuntu 13.10 Saucy Salamander

    Lightbulb Re: Acer/Ivybridge vs Screen Brightness

    Will do, but may be a bit later tonight. Gotta finish up work, then band practice. Long day.

    Thanks
    "Despite millions of dollars of research, Death continues to be Americas number one killer."

    Kingdom Computer Solutions

  2. #12
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    Re: Acer/Ivybridge vs Screen Brightness

    Quote Originally Posted by Toz View Post
    Can you try a few other options? After each option, please post back:
    1. The kernel boot line:
    Code:
    cat /proc/cmdline
    2. Your backlight interfaces:
    Code:
    for i in /sys/class/backlight/*; do echo $i; cat $i/brightness; cat $i/max_brightness; done
    3. Your dmesg file:
    Code:
    pastebinit /var/log/dmesg
    4. Whether the brightness function keys/brightness slider works.

    The options to try are (some you've already tried, but please try again):
    - GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_osi=\"!Windows 2012\""
    - GRUB_CMDLINE_LINUX_DEFAULT="quiet splash pcie_aspm=force acpi_backlight=vendor"
    - GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_osi=Linux acpi_backlight=vendor"

    I'd like to have a closer look at the dmesg files and the backlight interfaces.
    First one out of the gate worked

    The first one I tried was GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_osi=Linux acpi_backlight=vendor"

    That said, here is the other information you requested, maybe it will help you understand why it worked, so you can explain it to me

    Code:
    myk@myk-Aspire:~$ cat /proc/cmdline
    BOOT_IMAGE=/boot/vmlinuz-3.8.0-23-generic.efi.signed root=UUID=3d62caab-2bac-40b9-891e-e79eb8afd3cb ro quiet splash acpi_osi=Linux acpi_backlight=vendor vt.handoff=7

    Code:
    myk@myk-Aspire:~$ for i in /sys/class/backlight/*; do echo $i; cat $i/brightness; cat $i/max_brightness; done
    /sys/class/backlight/intel_backlight
    96
    976

    Code:
    myk@myk-Aspire:~$ pastebinit /var/log/dmesg
    http://paste.ubuntu.com/5740645/
    Brightness hotkeys and slider are working. Thank you so much.
    "Despite millions of dollars of research, Death continues to be Americas number one killer."

    Kingdom Computer Solutions

  3. #13
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    Xubuntu Development Release

    Re: Acer/Ivybridge vs Screen Brightness

    Perfect. Glad to hear.

    I noticed, after the fact, that you had mispelled backlight in your post #2. That was the first option and it worked. So you were close.

    acpi_osi=Linux tells the kernel to inform the bios that it is Linux so that it loads a certain set of acpi tables specific to Linux. acpi_backlight=vendor tells acpi to not use built in brightness management (acpi_video0), but to let the bios handle the brightness (in your case, intel_backlight).

  4. #14
    Join Date
    Jun 2012
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    8

    Re: Acer/Ivybridge vs Screen Brightness

    Could you both please help me?
    I have the same laptop Model (except that my intel generation is the second one), and I have tried the GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_osi=Linux acpi_backlight=vendor" but no luck. The other diference is that I use Kubuntu, I allready ask on their forums, but no luck
    Please help

  5. #15
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    Re: Acer/Ivybridge vs Screen Brightness

    Quote Originally Posted by mauricio288 View Post
    Could you both please help me?
    I have the same laptop Model (except that my intel generation is the second one), and I have tried the GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_osi=Linux acpi_backlight=vendor" but no luck. The other diference is that I use Kubuntu, I allready ask on their forums, but no luck
    Please help
    Can you confirm some information:
    1. The version of kubuntu you are using.

    2. Your current kernel boot parameter line:
    Code:
    cat /proc/cmdline
    3. Your video card and driver:
    Code:
    lspci -k | grep -A3 VGA
    4. Your backlight interfaces and their values:
    Code:
    for i in /sys/class/backlight/*; do echo $i; cat $i/brightness; cat $i/actual_brightness; cat $i/max_brightness; done
    5. Your dmesg log file:
    Code:
    pastebinit /var/log/dmesg
    ...and post back the link that is generated.

    6. Your Xorg log file:
    Code:
    pastebinit /var/log/Xorg.0.log
    ...and post back the link that is generated.

  6. #16
    Join Date
    Jun 2012
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    8

    Re: Acer/Ivybridge vs Screen Brightness

    Quote Originally Posted by Toz View Post
    Can you confirm some information:
    1. The version of kubuntu you are using.

    2. Your current kernel boot parameter line:
    Code:
    cat /proc/cmdline
    3. Your video card and driver:
    Code:
    lspci -k | grep -A3 VGA
    4. Your backlight interfaces and their values:
    Code:
    for i in /sys/class/backlight/*; do echo $i; cat $i/brightness; cat $i/actual_brightness; cat $i/max_brightness; done
    5. Your dmesg log file:
    Code:
    pastebinit /var/log/dmesg
    ...and post back the link that is generated.

    6. Your Xorg log file:
    Code:
    pastebinit /var/log/Xorg.0.log
    ...and post back the link that is generated.
    1. My version is Kubuntu 13.10 (same problem with 13.04) Kernel 3.11.0.12

    2. cat /proc/cmdline
    Code:
    BOOT_IMAGE=/boot/vmlinuz-3.11.0-12-generic root=UUID=0b573e08-fee6-43ca-af4c-2a98a22f5952 ro quiet splash acpi_osi=Linux acpi_backlight=vendor vt.handoff=7
    3. lspci -k | grep -A3 VGA
    Code:
    00:02.0 VGA compatible controller: Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller (rev 09)
            Subsystem: Acer Incorporated [ALI] Device 072a
            Kernel driver in use: i915
    00:14.0 USB controller: Intel Corporation 7 Series/C210 Series Chipset Family USB xHCI Host Controller (rev 04)
    4. for i in /sys/class/backlight/*; do echo $i; cat $i/brightness; cat $i/actual_brightness; cat $i/max_brightness; done
    Code:
    /sys/class/backlight/intel_backlight
    488
    488
    976
    5. pastebinit /var/log/dmesg
    http://paste.ubuntu.com/6274034/

    6. pastebinit /var/log/Xorg.0.log
    http://paste.ubuntu.com/6274043/

    Tanks for the reply

  7. #17
    Join Date
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    Re: Acer/Ivybridge vs Screen Brightness

    Can you try this:

    1. Create the file /usr/share/X11/xorg.conf.d/20-intel.conf:
    Code:
    sudo -i kate /usr/share/X11/xorg.conf.d/20-intel.conf
    ...enter your password when prompted.

    2. Copy/paste the following content:
    Code:
    Section "Device"
            Identifier  "card0"
            Driver      "intel"
            Option      "Backlight"  "intel_backlight"
            BusID       "PCI:0:2:0"
    EndSection
    3. Save the file.

    4. Log out and back in again to see if it works.

    If it still doesn't work, try removing the extra kernel parameters you added and trying again.

  8. #18
    Join Date
    Jun 2012
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    Talking Re: Acer/Ivybridge vs Screen Brightness

    Quote Originally Posted by Toz View Post
    Can you try this:

    1. Create the file /usr/share/X11/xorg.conf.d/20-intel.conf:
    Code:
    sudo -i kate /usr/share/X11/xorg.conf.d/20-intel.conf
    ...enter your password when prompted.

    2. Copy/paste the following content:
    Code:
    Section "Device"
            Identifier  "card0"
            Driver      "intel"
            Option      "Backlight"  "intel_backlight"
            BusID       "PCI:0:2:0"
    EndSection
    3. Save the file.

    4. Log out and back in again to see if it works.

    If it still doesn't work, try removing the extra kernel parameters you added and trying again.
    It worked
    it Worked!!!!

    I had to remove the kernel parameters for this to work

    Thanks for the help, that thing was driving me crazy, but now it's solved.

    I'll post it to my blog to help others, I'm not the only one with this problem

    Thanks again
    Last edited by mauricio288; October 21st, 2013 at 02:48 PM.

  9. #19
    Join Date
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    Location
    Toronto, Canada
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    Re: Acer/Ivybridge vs Screen Brightness

    Glad to hear. Out of curiosity, did you remove the kernel parameters or are you still using them?

  10. #20
    Join Date
    Jun 2012
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    8

    Re: Acer/Ivybridge vs Screen Brightness

    Yep I remove the parameters.

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