I'm using ubuntu 14.04 with kernel 3.13 and I installed the driver. Driver 
works perfectly, but htop shows when wifi is unblocked by rfkill one  CPU core 
is 100% used, but no process uses more then 3% of CPU. Indicator multiload 
shows CPU is used to 3-4% but iowait is 25%(I have 2 cores and 4 threads). When 
I run powerstats it shows, when wifi is unblocked power reises from 10W to 14W.
Do you have the same problem ? I used ubuntu 14.10 too but the same problem. 
Thanks.

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https://bugs.launchpad.net/bugs/1220146

Title:
  Need support for new Ralink Wifi card - Mediatek 7630 [14c3:7630]

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