I have been using "linux-image-generic-lts-wily" and an AR9271 Wifi dongle for many months: no problem. Of course, "open-ath9k-htc-firmware" is installed as well (is it on your system?).

$ uname -r
4.2.0-42-generic
$ lsmod | grep ath9k_htc
ath9k_htc              77824  0
ath9k_common           36864  1 ath9k_htc
ath9k_hw              466944  2 ath9k_common,ath9k_htc
ath                    32768  3 ath9k_common,ath9k_htc,ath9k_hw
mac80211              741376  4 rtl_pci,rtlwifi,ath9k_htc,rtl8188ee
cfg80211              552960  5 ath,ath9k_common,mac80211,rtlwifi,ath9k_htc
$ ip addr
1: lo:  mtu 65536 qdisc noqueue state UNKNOWN group default
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host
       valid_lft forever preferred_lft forever
2: eth0:  mtu 1500 qdisc pfifo_fast state DOWN group default qlen 1000
    link/ether 80:ee:73:66:88:f4 brd ff:ff:ff:ff:ff:ff
3: wlan0:  mtu 1500 qdisc mq state UP group default qlen 1000
    link/ether c0:4a:00:10:4e:bd brd ff:ff:ff:ff:ff:ff
    inet 150.164.202.171/24 brd 150.164.202.255 scope global wlan0
       valid_lft forever preferred_lft forever
    inet6 fe80::c24a:ff:fe10:4ebd/64 scope link
       valid_lft forever preferred_lft forever


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