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I've recently installed Ubuntu 14.04 in my Dell Inspiron 5521. I find that brightness is set to a maximum level and Brightness keys doesn't work though they show as if it gets decreased. I searched online and found a solution. But after following the steps, on rebooting, I got just a black screen. Tried brightness keys, yet black screen remains. To revert the changes, I live booted via a usb drive and solved. Now, Ubuntu boots, but still brightness remains maximum. Hope I'll get to solve this.

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Do

echo 500 >/sys/class/backlight/intel_backlight/brightness

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