CPU Frequency stuck at 1.2 ghz. tried all apps topic

I am using Samsung galaxy grand stock 4.2.2.
On checking via no frills cpu control I found that the cpu frequency is stuck at 1.2ghz.
it shows
max frequency : 1.2ghz
min frequency : 1.2ghz
I tried changing frequency with no frills cpu control , voltage control , setcpu . But I am unable to change the frequency.
Please give a solution ASAP.