I have a ony Vaio E Series SVE15113EN laptop. I am using a dual boot system with Win 7 and Ubuntu 12.04 LTS. In Ubuntu I am unable to adjust the brightness either by using Fn keys or by the default brightness adjust settings from system settings. The hot keys slide but no changes and the same is with the option from system settings menu in Ubuntu.
There are many threads here regarding this issue in this forum, but none has given a precise answer. That is the reason why I am opened a new thread. If this thread is duplicate kindly merge it with the relevant one. My eyes hurt from the extreme brightness from the screen forcing me to resort to windows. I think this laptop has a built in Intel HD graphics.
Hope to receive an answer from the experts here.
Thanking you all in advance for the replies.