Ubuntu can't connect to WiFi network AR9227

I just installed Ubuntu 17.04 And I have problems with my WiFi card. It can detect networks but it can't connect. I've tried wicd but it just said Bad Password even if it was right one.

Output of lshw:

  *-network
   description: Wireless interface
   product: AR9227 Wireless Network Adapter
   vendor: Qualcomm Atheros
   physical id: 6
   bus info: pci@0000:04:06.0
   logical name: wlp4s6
   version: 01
   serial: <censored>
   width: 32 bits
   clock: 66MHz
   capabilities: pm bus_master cap_list ethernet physical wireless
   configuration: broadcast=yes driver=ath9k driverversion=4.10.0-20-generic firmware=N/A latency=168 link=no multicast=yes wireless=IEEE 802.11
   resources: irq:20 memory:fe800000-fe80ffff

I have an TP-Link TL-WN751ND

wireless-info.txt: https://pastebin.com/puiDDuwN

Solution to that problem was in BIOS, I had to enable IOMMU and EHCI. Now all my problems with USB ports and WiFi are gone.