have the same issue on hp6460b // dmesg shoes this

[ 1493.614907] cfg80211: Disabling freq 2467 MHz
[ 1493.614911] cfg80211: Disabling freq 2472 MHz
[ 1493.614915] cfg80211: Disabling freq 2484 MHz
[ 1493.614921] cfg80211: World regulatory domain updated:
[ 1493.614926] cfg80211:     (start_freq - end_freq @ bandwidth), 
(max_antenna_gain, max_eirp)
[ 1493.614932] cfg80211:     (2402000 KHz - 2472000 KHz @ 40000 KHz), (300 mBi, 
2000 mBm)
[ 1493.614937] cfg80211:     (2457000 KHz - 2482000 KHz @ 20000 KHz), (300 mBi, 
2000 mBm)
[ 1493.614943] cfg80211:     (2474000 KHz - 2494000 KHz @ 20000 KHz), (300 mBi, 
2000 mBm)
[ 1493.614949] cfg80211:     (5170000 KHz - 5250000 KHz @ 40000 KHz), (300 mBi, 
2000 mBm)
[ 1493.614954] cfg80211:     (5735000 KHz - 5835000 KHz @ 40000 KHz), (300 mBi, 
2000 mBm)

hope it helps to find out the problems

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https://bugs.launchpad.net/bugs/964740

Title:
  WLAN Channel 13 not functional

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