unable to change brightness settings in sony vaio e series laptop

Posted by yashwanth on Ask Ubuntu See other posts from Ask Ubuntu or by yashwanth
Published on 2012-06-22T10:21:50Z Indexed on 2013/06/28 10:29 UTC
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brightness

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sony

I am using Sony Vaio E Series VPCEH25EN laptop. I installed ubuntu 12.04 64 bit version and I couldn't change my brightness level.

Always it is showing max brightness,

I tried to change by using echo 0 | sudo tee /sys/class/backlight/acpi_video0/brightness command.

When I run the above cmd it showing output as 0 but there is no change in brightness level. please help out how to change brightness levels.

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