Disable autobrightness on Ideapad U460s (ubuntu)

Question

I bought a laptop & installed Ubuntu on it.

I thought I would be OK with that autobrightness feature, but this thing makes my screen light dance most of the time.

There's no physical/BIOS switch on this...and also, when I phoned lenovo tech support, (after 5 redirects) they said they can't help me as "I'm not supposed to install Ubuntu on my machine"... -_-;;

Is there any way to disable this? I tried to fiddle with the driver settings but I didn't know what to do.

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Found a solution to this: I just blocked it with tinfoil + tape works great now =)

Answer 1

Use Windows, or block it with something.

Open the lenovo energy management (via the battery touch sensitive button) then click on the gear icon between "i" and "?" and click on smart control tab and uncheck ALS (Ambient Light Sensor)

the settings for brightness settings for battery and A/C plugged in can be changed here (Lenovo Energy Management) for each power scheme (click on the power scheme then click on the gear on the right) and you can change the settings in there.