Qualcomm Atheros AR9285 (driver ath9k) - active monitor mode

[ZerBea]

Recently I got a Qualcomm Atheros AR9285 Wireless Network Adapter (PCI-Express) (rev 01).
A first test has shown that the driver (ath9k) report that active monitor mode is supported:

$ hcxdumptool -L

Requesting physical interface capabilities. This may take some time.
Please be patient...

available wlan devices:

phy idx hw-mac       virtual-mac  m ifname           driver (protocol)
---------------------------------------------------------------------------------------------
  0   3 0025d3648d9a deee748360a6 * wlp3s0           ath9k (NETLINK)

* active monitor mode available
+ monitor mode available
- no monitor mode available

bye-bye

That is confirmed by iw:

$ iw list | grep active
	Device supports active monitor (which will ACK incoming frames)

Does this device really support active monitor mode or is it erroneously reported by the driver (like mt7601u)?