i installed the latest version of deepin on my hp elitebook 6930p. but now the problem i am facing is that i cannot change the brightness. when i press the fn +f9/f10 the dialog appears but no change in brightness. Also from control center, brightness is full but not max.
However when i restart the pc it has full brightness but when plug in or out the ac adapter, its again gos to low level.
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deepin 
i installed the latest version of deepin on my hp elitebook 6930p. but now the problem i am facing is that i cannot change the brightness. when i press the fn +f9/f10 the dialog appears but no change in brightness. Also from control center, brightness is full but not max.
However when i restart the pc it has full brightness but when plug in or out the ac adapter, its again gos to low level.
Please Reply ASAP.