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Mohit Bhagat
Asked: 2018-12-20 11:10:21 +0800 CST

Wifi Slow when connected to bluetooth on 18.04 Ubuntu

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My wifi speed significantly drops when i connect to bluetooth speaker. I came across many posts but as I am new to Ubuntu I am not able to figure out commands and their errors like as I tried following 

sudo options iwlwifi bt_coex_active=0 swcrypto=1 11n_disable=8

but it gives me error

sudo: options: command not found

Can someone please give me steps to solve the problem also ? Thanks in advance

Update 1: added following 

options iwlwifi bt_coex_active=0 swcrypto=1 11n_disable=8

to nano /etc/modprobe.d/iwlwifi.conf With no luck, Also one more behaviour i noticed is that. When I connect bluetooth my wifi begins to ask authentication again and again. i am using Asus laptop.

Update 2: grep [[:alnum:]] /sys/module/iwlwifi/parameters/* For this command : No such file or directory

Update 3: Output oflshw -C network: 

  *-network
       description: Wireless interface
       product: QCA9565 / AR9565 Wireless Network Adapter
       vendor: Qualcomm Atheros
       physical id: 0
       bus info: pci@0000:03:00.0
       logical name: wlp3s0
       version: 01
       serial: 54:27:1e:58:4e:9d
       width: 64 bits
       clock: 33MHz
       capabilities: bus_master cap_list rom ethernet physical wireless
       configuration: broadcast=yes driver=ath9k driverversion=4.15.0-42-generic firmware=N/A ip=192.168.0.105 latency=0 link=yes multicast=yes wireless=IEEE 802.11
       resources: irq:19 memory:f7800000-f787ffff memory:f7880000-f788ffff
networking bluetooth atheros

1 Answers

  1. The driver iwlwifi is a driver for Intel wireless devices. Your driver is ath9k and is for Atheros devices.

    First, let’s do some cleanup. We’ll remove the ineffective parameter:

    sudo rm /etc/modprobe.d/wlp3s0.conf

    The change you made to iwlwifi.conf will be ignored since the driver isn’t used.

    Next, try:

    sudo -i
echo "options ath9k btcoex_enable=1 bt_ant_diversity=1"  >  /etc/modprobe.d/ath9k.conf
exit

    Reboot and let us hear your report.

    Reference: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1746164

    Also, please note that bluetooth operates at 2.45 GHz; very close to channel 9 in wifi. It may be helpful to set your router to a fixed channel, not auto-select, and as far away as possible, channel 1, to see if it helps.

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