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How can I modify the screen brightness in Ubuntu 14.04 LTS ? In the Systems Settings -> Brightness & Lock screen, all I see are options related to the screen saver, but nothing for changing the current screen brightness. Shouldn't there be a scroll bar for brightness level in this window ?

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Finally found the issue... When this happened I had booted Ubuntu in recovery mode. Some options are not available in recovery mode, such as adjusting screen brightness and using multiple monitors.

When I booted back in normal mode, the screen brightness adjustment settings were available.

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