Random changes in screen brightness every few minutes (while working)

I am beginning to become unhappy with my new Thinkpad Twist. The laptop was just delivered and no changes to the setup were made.
The screen brightness changes while I use the device in an unpredictable way which is just annoying to me.
I prefer to work with full screen brightness and disabled the energy saving settings that would dim the screen after some minutes of inactivity. Still the screen just dims from time to time (also while I a am working) and also changes back to full brightness in a similarly unpredictable way. Those changes in brightness might take some minutes between them...
Do you have any ideas what software settings I should consider?
Also, the laptop appears to have an ambient light sensor. Could those changes in screen brightness be related to this sensor? FYI: Light conditions remained the same, no turning on or off the lights. Covering the position of the sensor did not induce any reaction.
Any ideas?
Solved!
Go to Solution.

Took me a while to find this but I believe this is the order of menus, links and drop downs to get to this feature.
Control Panel / Power Options / Change Plan Options / Change Advanced Power Settings / Display / Enable Adaptive Brightness / OFF / OFF

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Random changes in screen brightness every few minutes (while working)

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