Hello, I can assist you with this. The Auto Dim is a setting within Chrome. To disable this Open chrome and type the following into the address bar chrome://flags/#auto-screen-brightness.
From there you can change the setting from Default to Disabled. This should disable the auto-brightness. Here is a link to help get the most out of your battery life with Chrome OS https://www.theguardian.com/technology/2017/feb/08/google-chrome-six-tips-to-make-it-suck-less-battery-power . If your issue persists please contact Lenovo Chromebook Tech Support at 800-426-7378
6 years ago
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Lenovo Product Expert