Back on my fan pb, I can't force a RPM. It keep going up and down idk why. I set temp target to 50, it's now 52° and fan are decreasing speed.
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Some numbers seems to be reversed. Try higher target instead of lower.
It's like i can't force cgminer to a fix % fan. I set the temp target at 60 but same problem, it starts hashing with fans at 2600rpm, with --avalon-fan 50 and go down to 2150 and 2060 and 1980 etc etc etc, then stop.
http://img15.hostingpics.net/pics/862849Sanstitre.png
and now its stopped
Just got my machine running its only hashing at 140gh but I am having the same problem as you after about 6 minutes the fans stop spinning also I dont have any fan RPMS listed under the cgminer status window.
When ever I apply --avalon-fan 20 or any other number they speed up for like 2 seconds then they slow back way down.