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though I am Pressing Brightness Keys on my laptop.The brightness is still not changing But Showing Change in Progress Bar of Brightness Setting.

Hardware Spec:
Intel Pentium Dual Core 2.1 GHz 64 bit Processor;
Intel HD3000 Graphic card;
2 GB ram 1333 MHz;
500 GB HDD Sata;
Model: Lenovo G580(2689);

Ubuntu 13.10 Updated Up to date

No problem if I get temporary Solutions...But Please help.

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What drivers do your graphics cards have? Use lspci -v. –  Wilf Jan 18 at 15:37
    
VGA compatible controller: Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller i have got A solution on Some where on Ask Ubuntu for Temporary. I have to do this every time when i Restart my Machine: sudo su echo 150 > /sys/class/backlight/intel_backlight/brightness –  Mohamadali Shaikh Jan 21 at 10:45

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