Ideapad u300s youcam 3 webcam image very dark and exposure button not moving

Just got the u300s after hearing so much about it. Webcam image is very dark and exposure button is not working. auto adjust doesnt help. Even iphone4 front camera has a better exposure control. Can anyone help if it is software or hardware problem. Very disappointing.

Exactly the same issue. The exposure setting won't change. It's not even that it doesn't save, as you look at the preview screen, all of the video proc amp setting change live, but when you get onto exposure, it does nothing. And then it doesn't save.
 So this issue has been floating around for about 3 years and nothing has come to light to fix it.

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