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Thread: Acer/Ivybridge vs Screen Brightness

  1. #1
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    Thumbs up Acer/Ivybridge vs Screen Brightness

    Bought a new laptop today, an Acer Aspire V5-571P. Full specs as reported by lshw are attached.

    Everything seems to be working fine (including the touchscreen), except for screen brightness. Wonder if I can get a little assistance on that, as turning down the brightness should yield a significant boost in battery life.

    thanks,
    -myk
    Attached Files Attached Files
    Last edited by mykrob; June 7th, 2013 at 03:20 AM.
    "Despite millions of dollars of research, Death continues to be Americas number one killer."

    Kingdom Computer Solutions

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

    I tried this:

    GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_osi=Linux acpi_backight=vendor"

    Based on a bug report, and it did not work for me.
    "Despite millions of dollars of research, Death continues to be Americas number one killer."

    Kingdom Computer Solutions

  3. #3
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    Re: Acer/Ivybridge vs Screen Brightness

    I also tried updating the Intel graphics driver, still no luck
    "Despite millions of dollars of research, Death continues to be Americas number one killer."

    Kingdom Computer Solutions

  4. #4
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    Re: Acer/Ivybridge vs Screen Brightness

    Quote Originally Posted by mykrob View Post
    I tried this:

    GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_osi=Linux acpi_backight=vendor"

    Based on a bug report, and it did not work for me.
    Can you give the following a try:
    Code:
    GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_osi=\"!Windows 2012\""
    Which version of Ubuntu are you installing?

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

    13.04 64 bit. Going to try that boot parameter.
    "Despite millions of dollars of research, Death continues to be Americas number one killer."

    Kingdom Computer Solutions

  6. #6
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    Re: Acer/Ivybridge vs Screen Brightness

    No luck, same results as before. The on screen display comes up that shows the keypresses are being received and are attempting to trigger the right response, but the screen does not get any brighter or dimmer.
    "Despite millions of dollars of research, Death continues to be Americas number one killer."

    Kingdom Computer Solutions

  7. #7
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    Re: Acer/Ivybridge vs Screen Brightness

    Just to confirm, are you running "sudo update-grub" after editing the file?

    Can you also try:
    Code:
    GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_osi="
    After reboot (with those parameters), can you post back:
    Code:
    cat /proc/cmdline
    Code:
    sudo lspci -vnn  |grep -A12 VGA
    ...and the link generated from:
    Code:
    pastebinit /var/log/dmesg

  8. #8
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    Re: Acer/Ivybridge vs Screen Brightness

    Yes, I'm running the update command each time I edit grub. I will try your most recent suggestion(s) and post back shortly.
    Thanks
    "Despite millions of dollars of research, Death continues to be Americas number one killer."

    Kingdom Computer Solutions

  9. #9
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    Re: Acer/Ivybridge vs Screen Brightness

    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= vt.handoff=7
    Code:
    myk@myk-Aspire:~$ sudo lspci -vnn |grep -A12 VGA
    [sudo] password for myk: 
    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: Acer Incorporated [ALI] Device [1025:072d]
    	Flags: bus master, fast devsel, latency 0, IRQ 45
    	Memory at f0000000 (64-bit, non-prefetchable) [size=4M]
    	Memory at e0000000 (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])

    http://paste.ubuntu.com/5738997/


    thanks for all your assistance thus far.
    "Despite millions of dollars of research, Death continues to be Americas number one killer."

    Kingdom Computer Solutions

  10. #10
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    Re: Acer/Ivybridge vs Screen Brightness

    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.

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