First I Have explicitly set radeon.dpm = 1 which did not solve the problem. Then I have explicitly set radeon.dpm = 1 and forced High performance mode. It did not solve the problem either. Then finally I did not explicitly set radeon.dpm = 1 but it was enabled implicitly and i forced High performance mode and no more currupton. Curruption is gone after forcing high performance mode in dpm or disabling dpm with radeon.dpm = 0 . Please look into this.