I found a workaround. Maybe someone find it useful.

In kernel source, file:

drivers/net/wireless/ralink/rt2x00/rt2800lib.c

function:

int rt2800_wait_wpdma_ready(struct rt2x00_dev *rt2x00dev)

replace:

return -EACCES;

by:

return 0;


That forces the code to continue even if the card seems to be busy. But
it works for me. Maybe is not really busy... Who knows.

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https://bugs.launchpad.net/bugs/1584542

Title:
  Wifi Adapter Fails to come up after restart. after power off works
  fine

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