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My Lenovo Thinkpad X201 automatically changes display brightness from time to time. The specs do not mention an ambient light sensor. Power management settings are on Presentation (timers off). Any ideas on how to turn this behavior off?

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up vote 1 down vote accepted

You need to disable your graphics chipsets Adaptive Brightness (Intel) or Vari-Bright (AMD) option.

On my x120e I had to:

  • Download the AMD/ATI Vision Control Center
  • Launch the Vision control center and click "PowerPlay"
  • Uncheck "Enable Vari-Bright"

There are probably similar steps for the Intel technology.

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I had this too. Unfortunately I don't remember exactly how I fixed it, but I think it went away when I disabled most of the junk Lenovo puts in the Windows startup folders. Install CCleaner, go to Tools/Startup and try disabling stuff. It's perfectly safe, if anything goes wrong just re-enable it.

Please let us know if you find the exact process, because this is something I'd like to switch on manually when out in the sunlight. But the auto sensor was way too sensitive.

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Thanks. Tried that using msconfig. There does not seem to be a service / startup item name related to the brightness sensor. Unfortunately the effect does not happen very often, so it's (too?) hard to find the right service by trial and error. – tamberg May 31 '10 at 11:40

go to control panel hardware setting press green hightlighted takes you to hardware options press green hightlighted power options on the bottom of the panel is a slide to turn brightness up and down

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