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Thread: Brightness not working on Sony [SVE14127CNW]

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  1. #1
    Join Date
    Jan 2011
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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

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