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[Edoardo Rossi <edd.rossi@xxxxxxxxx>]

Thank you so much for your incredible help.

On this Asus X552C and Network controller: MEDIATEK Corp. MT7630e
802.11bgn Wireless Network Adapter the #125 and #154 solved the problem.

But...

I'm noticing a strange and continuos spike in the CPU activity:
                                                                                                                                                 
PID USER      PR  NI    VIRT    RES    SHR S  %CPU %MEM     TIME+ COMMAND
  21 root      20   0       0      0      0 R 100.0  0.0  16:10.98 ksoftirqd/1 

'/1' depends on the CPU used obviously.
If I disable the WiFi connection, everything comes back to normal.

I hope this can be useful... any suggestion?

Linux linuxbox 3.13.0-34-generic #60-Ubuntu SMP Wed Aug 13 15:45:27 UTC
2014 x86_64 x86_64 x86_64 GNU/Linux

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

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

Status in HWE Next Project:
  Confirmed
Status in HWE Next trusty series:
  Confirmed
Status in The Linux Kernel:
  Confirmed
Status in “linux” package in Ubuntu:
  Confirmed
Status in “linux” source package in Raring:
  Incomplete
Status in “linux” source package in Saucy:
  Incomplete
Status in “linux” package in Fedora:
  New

Bug description:
  This device is appearing in some OEM machines, but driver is not yet
  available in mainline.

  The driver seems to be present in machines with pre-installed OS, but
  isn't available on the download-and-install versions!

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