Macbook Air 11" 2011 screen brightness

My macbook Air 11" 2011 screen brightness seems defective.
Whenever I turn it on, it automatically goes to low brightness whatever the ambient lighting conditions.
Anyone with the same problem ?
Thanks !

This was my battery info last time I checked
Charge Information:
  Charge Remaining (mAh):          0
  Fully Charged:          No
  Charging:          No
  Full Charge Capacity (mAh):          0
  Health Information:
  Cycle Count:          0
  Battery Installed:          No
  Amperage (mA):          0
  Voltage (mV):          0
What is going on?

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