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Thread: Sony Vaio E-Series (SVE15113EN) Brightness Issue

  1. #1
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    Sony Vaio E-Series (SVE15113EN) Brightness Issue

    Hi everyone,

    This is my first post. I went through the entire thread Toz and Karl was discussing. I have the same issue and same laptop, where the only difference is my laptop is Sony vaio SVE15113EN. I tried some your tips but no end result. I am a novice in Linux, literally.

    One of the most interesting part is that when I checked inside etc/acpi and etc/acpi/events, instead of having sony brightness files, I have Asus brightness files. I am confused with this.

    Can you help me guys. The bright screen is hurting my eyes.

    Than you in advance for your replies.

  2. #2
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    Re: Sony Vaio E-Series (SVE15113EN) Brightness Issue

    Moving post to its own thread. Originally posted in http://ubuntuforums.org/showthread.php?t=2033273.

    Hello and welcome to the forums. Can we please confirm some information:

    1. What version and flavour of ubuntu are you using?

    2. Your current kernel command line:
    Code:
    cat /proc/cmdline
    3. Your video card and driver:
    Code:
    sudo lspci -vnn | grep -A12 VGA
    4. You backlight interfaces:
    Code:
    for i in /sys/class/backlight/*; do echo $i; cat $i/brightness; cat $i/max_brightness; done

  3. #3
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    Unhappy Re: Sony Vaio E-Series (SVE15113EN) Brightness Issue

    Hi Toz,

    Thank you for the reply.

    1. Ubuntu 12.04LTS

    2. My current kernel command line:
    Code:
    BOOT_IMAGE=/boot/vmlinuz-3.5.0-36-generic root=UUID=c9f390f4-3d8d-473f-adae-955af075f7a6 ro quiet splash acpi_backlight=video vt.handoff=7
    3. My Video card and Driver:

    Code:
    00:02.0 VGA compatible controller [0300]: Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller [8086:0116] (rev 09) (prog-if 00 [VGA controller])
        Subsystem: Sony Corporation Device [104d:90ac]
        Flags: bus master, fast devsel, latency 0, IRQ 45
        Memory at 94000000 (64-bit, non-prefetchable) [size=4M]
        Memory at 80000000 (64-bit, prefetchable) [size=256M]
        I/O ports at 5000 [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
        Kernel modules: i915
    4. My You backlight interfaces:

    Code:
    /sys/class/backlight/acpi_video0
    5
    15
    /sys/class/backlight/intel_backlight
    2500
    4882
    The 2500 appears there because I applied this command "echo XXXX | sudo tee - /sys/class/backlight/intel_backlight/brightness", where xxxx is 2500.

    These are the files inside /etc/acpi

    Code:
    /etc/acpi$ ls
    asus-brn-down.sh            brightdown.sh~   lid.sh       powerbtn.sh      sleep.sh                       webbtn.sh
    asus-brn-up.sh              brightup.sh~     lockbtn.sh   power.sh         stopbtn.sh
    asus-keyboard-backlight.sh  ejectbtn.sh      mailbtn.sh   prevbtn.sh       thinkpad-stretchortouchpad.sh
    asus-touchpad.sh            events           mediabtn.sh  rotatescreen.sh  tosh-wireless.sh
    asus-wireless.sh            hibernate.sh     nextbtn.sh   screenblank.sh   undock.sh
    batterybtn.sh               ibm-wireless.sh  playbtn.sh   sleepbtn.sh      videobtn.sh

    Why do I have Asus and Toshiba files?

    Eagerly waiting for your reply. Thank you
    Last edited by deepupn; July 16th, 2013 at 01:31 PM. Reason: adding more information

  4. #4
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    Re: Sony Vaio E-Series (SVE15113EN) Brightness Issue

    Can you try with the kernel parameter acpi_backlight=vendor instead (to see if we can get just one backlight interface)? After reboot, post back:
    Code:
    cat /proc/cmdline
    ...and
    Code:
    for i in /sys/class/backlight/*; do echo $i; cat $i/brightness; cat $i/max_brightness; done
    Also try brightness function keys and echoing directly into backlight interface again so see if it works?

    Why do I have Asus and Toshiba files?
    Those are just the default files for other laptop manufacturers.
    Last edited by Toz; July 16th, 2013 at 03:45 PM.

  5. #5
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    Re: Sony Vaio E-Series (SVE15113EN) Brightness Issue

    Hi Toz,

    Thank you for the reply.

    1. cat /proc/cmdline:

    Code:
    BOOT_IMAGE=/boot/vmlinuz-3.5.0-36-generic root=UUID=c9f390f4-3d8d-473f-adae-955af075f7a6 ro quiet splash acpi_backlight=vendor vt.handoff=7
    2. for i in /sys/class/backlight/*; do echo $i; cat $i/brightness; cat $i/max_brightness; done:
    Code:
    /sys/class/backlight/intel_backlight
    2500
    4882
    /sys/class/backlight/sony
    6
    7
    I forgot to tell you that before contacting you, I had applied this command also.
    Code:
     "sudo modprobe -r sony_laptop".
    Now when i try to adjust the brightness using the Fn keys what happens is, slider doesn't move all the way back. It just slides back just a little back. I thought you wanted to know this.

    Toz, I am a very very novice in terms of linux.

    I didn't understand what you meant by this "and echoing directly into backlight interface again so see if it works?"

    Thanking you in advance for the reply and patience.

  6. #6
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    Re: Sony Vaio E-Series (SVE15113EN) Brightness Issue

    I didn't understand what you meant by this "and echoing directly into backlight interface again so see if it works?"
    You did this earlier with the command:
    Code:
    echo XXXX | sudo tee /sys/class/backlight/<INTERFACE>/brightness
    ...but hold on to this for a second. We'll test these shortly.

    -----

    Try removing the acpi_backlight parameter so there is nothing there. Run "sudo update-grub" and reboot. Once rebooted, don't "sudo modprobe -r sony_laptop" and post back again:
    Code:
    cat /proc/cmdline
    ...and
    Code:
    for i in /sys/class/backlight/*; do echo $i; cat $i/brightness; cat $i/max_brightness; done
    Lets see what interfaces you have.

  7. #7
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    Re: Sony Vaio E-Series (SVE15113EN) Brightness Issue

    Hi Toz,

    Here are the new results:-

    1. cat /proc/cmdline:

    Code:
    BOOT_IMAGE=/boot/vmlinuz-3.5.0-36-generic root=UUID=c9f390f4-3d8d-473f-adae-955af075f7a6 ro quiet splash vt.handoff=7
    2. for i in /sys/class/backlight/*; do echo $i; cat $i/brightness; cat $i/max_brightness; done

    Code:
    /sys/class/backlight/acpi_video0
    6
    15
    /sys/class/backlight/intel_backlight
    4882
    4882
    Thank you for the reply.

  8. #8
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    Re: Sony Vaio E-Series (SVE15113EN) Brightness Issue

    Which of the following sets of commands change the brightness?
    Code:
    echo 15 | sudo tee /sys/class/backlight/acpi_video0/brightness
    echo 6 | sudo tee /sys/class/backlight/acpi_video0/brightness
    Code:
    echo 2441 | sudo tee /sys/class/backlight/intel_backlight/brightness
    echo 4882 | sudo tee /sys/class/backlight/intel_backlight/brightness

  9. #9
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    Re: Sony Vaio E-Series (SVE15113EN) Brightness Issue

    Hi Toz,

    Sorry for the late reply. I was very sleepy last night. It was almost 3 AM.

    Now the results are that no chages occur when these two commands are given:

    Code:
    echo 15 | sudo tee /sys/class/backlight/acpi_video0/brightness 
    echo 6 | sudo tee /sys/class/backlight/acpi_video0/brightness
    But when I apply the command having intel reference, the brightness does change.

    Thank you for the reply and patience.

  10. #10
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    Re: Sony Vaio E-Series (SVE15113EN) Brightness Issue

    Okay, lets try one more thing before we look at creating a workaround script for you.

    First, can you:
    Code:
    echo 0 | sudo tee /sys/class/backlight/intel_backlight/brightness
    ...then can you try the brightness function keys and slider again to see if they work.

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