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Thread: Brightness not working on Sony [SVE14127CNW]

  1. #1
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    Question Brightness not working on Sony [SVE14127CNW]

    I have tried both the proprietary drivers(fglrx) given under Software sources->Additional drivers then computer opens in command line mode. I have tried all

    I have also tried manually installing amd-driver-installer-catalyst-13.1-linux-x86.x86_64 but it also failed.
    I followed this thread(http://ubuntuforums.org/showthread.php?t=2088190) but no change in brightness.
    Code:
    gautam@gautam-laptop:~$ cat /proc/cmdline 
    BOOT_IMAGE=/boot/vmlinuz-3.5.0-17-generic root=UUID=706abb01-8cff-48d5-86d6-4812dc2e86ad ro quiet splash vt.handoff=7
    Code:
    gautam@gautam-laptop:~$ for i in /sys/class/backlight/*; do echo $i; cat $i/brightness; cat $i/max_brightness; done
    /sys/class/backlight/acpi_video0
    5
    15
    Code:
    gautam@gautam-laptop:~$ sudo dmidecode -s system-manufacturer
    [sudo] password for gautam: 
    Sony Corporation
    Code:
    gautam@gautam-laptop:~$ sudo dmidecode -s system-product-name
    SVE14127CNW
    Code:
    gautam@gautam-laptop:~$ sudo lspci -vnn | grep -A12 VGA
    01:00.0 VGA compatible controller [0300]: Advanced Micro Devices [AMD] nee ATI Thames [Radeon 7500M/7600M Series] [1002:6841] (prog-if 00 [VGA controller])
        Subsystem: Sony Corporation Device [104d:90aa]
        Flags: bus master, fast devsel, latency 0, IRQ 45
        Memory at e0000000 (64-bit, prefetchable) [size=256M]
        Memory at f7e20000 (64-bit, non-prefetchable) [size=128K]
        I/O ports at e000 [size=256]
        Expansion ROM at f7e00000 [disabled] [size=128K]
        Capabilities: [50] Power Management version 3
        Capabilities: [58] Express Legacy Endpoint, MSI 00
        Capabilities: [a0] MSI: Enable+ Count=1/1 Maskable- 64bit+
        Capabilities: [100] Vendor Specific Information: ID=0001 Rev=1 Len=010 <?>
        Capabilities: [150] Advanced Error Reporting
        Kernel driver in use: radeon
    Code:
    gautam@gautam-laptop:~$ echo 15 | sudo tee /sys/class/backlight/acpi_video0/brightness
    15
    Code:
    gautam@gautam-laptop:~$ echo 5 | sudo tee /sys/class/backlight/acpi_video0/brightness
    5
    Code:
    gautam@gautam-laptop:~$ acpi_listen
    video LCD 00000087 00000000
    video VGA 00000081 00000000
    video VGA 00000081 00000000
    video LCD 00000087 00000000
    video VGA 00000081 00000000
    video VGA 00000081 00000000
    Last edited by sandyd; April 29th, 2013 at 07:01 PM. Reason: code tags

  2. #2
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    Re: Brightness not working on Sony [SVE14127CNW]

    Hello and welcome to the forums.
    Quote Originally Posted by gautamverma View Post
    gautam@gautam-laptop:~$ cat /proc/cmdline
    BOOT_IMAGE=/boot/vmlinuz-3.5.0-17-generic root=UUID=706abb01-8cff-48d5-86d6-4812dc2e86ad ro quiet splash vt.handoff=7
    Have you tried the acpi_backlight=vendor kernel boot paramater (see the Kernel Boot Parameters link in my signature for information on how)?
    gautam@gautam-laptop:~$ for i in /sys/class/backlight/*; do echo $i; cat $i/brightness; cat $i/max_brightness; done
    /sys/class/backlight/acpi_video0
    5
    15
    gautam@gautam-laptop:~$ echo 15 | sudo tee /sys/class/backlight/acpi_video0/brightness
    15
    gautam@gautam-laptop:~$ echo 5 | sudo tee /sys/class/backlight/acpi_video0/brightness
    5
    Does manually echoing the value 5 change the actual brightness?
    gautam@gautam-laptop:~$ acpi_listen
    video LCD 00000087 00000000
    video VGA 00000081 00000000
    video VGA 00000081 00000000
    video LCD 00000087 00000000
    video VGA 00000081 00000000
    video VGA 00000081 00000000
    Which of these are displayed when the brightness up key is pressed and which are displayed when the brighntess down key is pressed?

  3. #3
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    Re: Brightness not working on Sony [SVE14127CNW]

    Quote Originally Posted by Toz View Post
    Hello and welcome to the forums.

    Have you tried the acpi_backlight=vendor kernel boot paramater (see the Kernel Boot Parameters link in my signature for information on how)?

    Does manually echoing the value 5 change the actual brightness?

    Which of these are displayed when the brightness up key is pressed and which are displayed when the brighntess down key is pressed?
    Code:
    Brightness key down is pressed
    video LCD 00000087 00000000
    video VGA 00000081 00000000
    
    Brightness Key up is pressed
    video LCD 00000086 00000000
    video VGA 00000081 00000000
    No manually eching the value 5 doesn't change the brightness. i did echo by this command echo 5 | sudo tee /sys/class/backlight/acpi_video0/brightness

    I tried adding that parameter to kernal, then the computer opens in the commad line mode. (No window type display.)

    I have even third party drivers supplied by ubuntu repositories but none worked.
    Last edited by sandyd; April 29th, 2013 at 07:02 PM. Reason: code tags

  4. #4
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    Re: Brightness not working on Sony [SVE14127CNW]

    One thing to add that i am using 12.10 old build(february or march) , in the latest build no display showiing at all(when i trying ubuntu without installing), only a flickering line of 5 pixel height on the top.

  5. #5
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    Re: Brightness not working on Sony [SVE14127CNW]

    I tried adding that parameter to kernal, then the computer opens in the commad line mode. (No window type display.)
    Adding that entry shouldn't have caused that problem. Did you add the entry temporarily during boot or permanently by editing /etc/default/grub. If the later, can you please post back the contents of /etc/default/grub?

  6. #6
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    Re: Brightness not working on Sony [SVE14127CNW]

    i added the entry to /etc/default/grub
    Code:
    The contents of /etc/default/grub
    # If you change this file, run 'update-grub' afterwards to update
    # /boot/grub/grub.cfg.
    # For full documentation of the options in this file, see:
    #   info -f grub -n 'Simple configuration'
    
    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=""
    
    # Uncomment to enable BadRAM filtering, modify to suit your needs
    # This works with Linux (no patch required) and with any kernel that obtains
    # the memory map information from GRUB (GNU Mach, kernel of FreeBSD ...)
    #GRUB_BADRAM="0x01234567,0xfefefefe,0x89abcdef,0xefefefef"
    
    # Uncomment to disable graphical terminal (grub-pc only)
    #GRUB_TERMINAL=console
    
    # The resolution used on graphical terminal
    # note that you can use only modes which your graphic card supports via VBE
    # you can see them in real GRUB with the command `vbeinfo'
    #GRUB_GFXMODE=640x480
    
    # Uncomment if you don't want GRUB to pass "root=UUID=xxx" parameter to Linux
    #GRUB_DISABLE_LINUX_UUID=true
    
    # Uncomment to disable generation of recovery mode menu entries
    #GRUB_DISABLE_RECOVERY="true"
    
    # Uncomment to get a beep at grub start
    #GRUB_INIT_TUNE="480 440 1"
    I downloaded and tried 13.04, no display at all only a blank lighted screen.
    Last edited by sandyd; April 29th, 2013 at 07:02 PM. Reason: code tags

  7. #7
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    Re: Brightness not working on Sony [SVE14127CNW]

    i tried 13.04 with nomodeset parameter to kernal then it opened in the commad line mode i.e with no GUI.

  8. #8
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    Re: Brightness not working on Sony [SVE14127CNW]

    You should create a new thread for 13.04 and blank screen with ATi drivers, there are others here that might be able to provide assistance with getting the driver installed.

    As for 12.10 and grub, I don't see the acpi_backlight entry in your config file. Make sure that the line:
    GRUB_CMDLINE_LINUX=""
    ...reads:
    Code:
    GRUB_CMDLINE_LINUX="acpi_backlight=vendor"
    ...then run:
    Code:
    sudo update-grub
    ...and reboot.

  9. #9
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    Re: Brightness not working on Sony [SVE14127CNW]

    Quote Originally Posted by Toz View Post
    You should create a new thread for 13.04 and blank screen with ATi drivers, there are others here that might be able to provide assistance with getting the driver installed.

    As for 12.10 and grub, I don't see the acpi_backlight entry in your config file. Make sure that the line:

    ...reads:
    Code:
    GRUB_CMDLINE_LINUX="acpi_backlight=vendor"
    ...then run:
    Code:
    sudo update-grub
    ...and reboot.

    I did add the entry as you said but nothing happened, brightness is still at maximum. The only change is now the brightness slider is not showing up when i am increasing or decreasing the brightness.

  10. #10
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    Re: Brightness not working on Sony [SVE14127CNW]

    Can you try the following kernel parameter?
    Code:
    GRUB_CMDLINE_LINUX="acpi_osi="
    Remember to run:
    Code:
    sudo update-grub
    ...afterwards.

    If it doesn't work, can you post back the following:
    Code:
    cat /proc/cmdline
    sudo lspci -vnn | grep -A12 VGA
    ...and the link that is generated when you run:
    Code:
    pastebinit /var/log/dmesg

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