#14 Can't get current fan speed with an HD 6770

[Photon]

I'm experiencing the now closed bug #5 (https://sourceforge.net/p/amdovdrvctrl/bugs/5/) with my HD6770. aticonfig is able to read the fan speed percentage

$ aticonfig --pplib-cmd "get fanspeed 0"
Fan speed query: 
Query Index: 0, Speed in percent
Result: Fan Speed: 5%

but AMDOverdriveCtrl is not:

$ AMDOverdriveCtrl
INF: Nr. of Adapters: 3
INF: Adapter index: 0, active, ID:21791408, AMD Radeon HD 6700 Series  
INF: Adapter index: 1, inact., ID:21791408, AMD Radeon HD 6700 Series  
INF: Adapter index: 2, inact., ID:21791408, AMD Radeon HD 6700 Series  
INF: Adapter index 0 choosen.
INF: Nr. of Performance Levels: 3
INF: Card's default Perf Level 0: GPU 157MHz Memory 300MHz Voltage 0.95V
INF: Card's default Perf Level 1: GPU 500MHz Memory 1200MHz Voltage 1.1V
INF: Card's default Perf Level 2: GPU 850MHz Memory 1200MHz Voltage 1.2V
WRN: failed to get fan speed information.
ACT: Set fan speed to default
INF: FanCtrl mode off
INF: Nr. of Displays to check 4
INF: Color temp disp(2) : 
INF: current 6500K default 6500K
INF: min 4000K max 10000K step 100K
WRN: color temperature setting not supported.

What could be the problem?