I am using Qualcomm Atheros AR9565 card and when I use bluetooth headset, wifi slows down. I tried to disable Bluetooth collaboration on windows but I didn't find any option on windows. I have Ubuntu 18.04.3 LTS installed on my lenovo g50-70 laptop.


02:00.0 Network controller [0280]: Qualcomm Atheros QCA9565 / AR9565 Wireless Network Adapter [168c:0036] (rev 01)
    Subsystem: Lenovo QCA9565 / AR9565 Wireless Network Adapter [17aa:4026]
    Kernel driver in use: ath9k
    Kernel modules: ath9k
Bus 001 Device 002: ID 8087:8000 Intel Corp. 
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 003 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 002 Device 007: ID 0cf3:3004 Atheros Communications, Inc. AR3012 Bluetooth 4.0
Bus 002 Device 003: ID 5986:055d Acer, Inc 
Bus 002 Device 002: ID 0bda:0129 Realtek Semiconductor Corp. RTS5129 Card Reader Controller
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  • Please edit your question and add output of lspci -knn | grep Net -A3; lsusb terminal command. – Pilot6 Jan 5 at 8:08
  • Does it slow down on Windows or Ubuntu? – Pilot6 Jan 5 at 8:09
  • @Pilot6 on both. – a2nineu Jan 5 at 8:25

When you are using 2.4 GHz Wi-Fi and stream audio using bluetooth, it is generally normal that Wi-Fi slows down. Bluetooth uses the same frequency.

You can enable bluetooth coexistence on Ubuntu, but it is not perfect either.

It can be enabled by a terminal command

sudo tee /etc/modprobe.d/ath9k.conf <<< "options ath9k btcoex_enable=1"

Reboot to apply.

If this setting doesn't help or makes things worse, revert it by

sudo rm /etc/modprobe.d/ath9k.conf
| improve this answer | |
  • It didn't create any difference, situation is still worse like around 2mbps when listening to songs on headset but 20mbps when I disconnect the device. – a2nineu Jan 5 at 8:41
  • There is nothing else to suggest with this hardware. – Pilot6 Jan 5 at 8:52
  • Alright so every bluetooth device will create problems with my laptop? unless I some how use 5ghz wifi? – a2nineu Jan 5 at 8:55
  • You have a combo Wi-Fi+BT device. If you use another BT device, it may be better. – Pilot6 Jan 5 at 8:56
  • You mean a usb bluetooth device for laptop? – a2nineu Jan 5 at 9:00

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