Strange issue. But it shows really fan speed. It happends on one farm with r9 nano and -tt flag. On others with -tt flags it's ok.
ETH - Total Speed: 50.038 Mh/s, Total Shares: 0, Rejected: 0, Time: 00:04
ETH: GPU0 25.013 Mh/s, GPU1 25.025 Mh/s
DCR - Total Speed: 1751.339 Mh/s, Total Shares: 45, Rejected: 1
DCR: GPU0 875.450 Mh/s, GPU1 875.889 Mh/s
Cannot get current fan speed
GPU0 t=51C fan=-1%, GPU1 t=74C fan=46%, GPU2 t=74C fan=44%
DCR: 06/01/16-15:35:21 - SHARE FOUND - (GPU 0)
DCR: Share accepted (63 ms)!
Cannot get current fan speed
Cannot get current fan speed
And it's not very good fan algo control by miner. Trixx auto fan control works much smoother. For example it stable with 75 degree and 41% fan with Trixx. Your's goes much higher to cooling down GPU and then much lower when temp is far from 75 degree. So it's go up and down too much.
As i understand right automatix trix control works with preemptive mechanism. For example if temp target 75 so if it's now 74 the fans goes up a bit and it's looks smoother.