4

My Issue

Wifi is slow or completely broken when using Bluetooth headphones.

It is said that this is a well know issue as BT and WiFi share the 2.4Ghz frequency.

Is this something that could be solved? Are cheap/low end devices more problematic than quality ones?

What I Have Tried

  1. Disable coexistence in iwlwifi, run following command and reboot:

    $ sudo tee /etc/modprobe.d/iwlwifi-opt.conf <<< "options iwlwifi bt_coex_active=N"

This was only a slight improvement as it changed the speed of wifi from zero to unusably slow.

  1. Try different channels on router.

I tried both ends of the spectrum (1 and 11), neither created any improvement. Wifi still broken as soon as headphones are turned on. Setting router channel to auto has the best results so far.

System Info

$ uname -a
Linux alien-box 4.15.0-29-lowlatency #31-Ubuntu SMP PREEMPT Tue Jul 17 17:49:04 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux

$ lspci -knn | grep Net -A3; lsusb
04:00.0 Network controller [0280]: Intel Corporation Wireless 7265 [8086:095a] (rev 59)
    Subsystem: Intel Corporation Dual Band Wireless-AC 7265 [8086:5410]
    Kernel driver in use: iwlwifi
    Kernel modules: iwlwifi
Bus 002 Device 002: ID 8087:8000 Intel Corp. 
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 002: ID 8087:8008 Intel Corp. 
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 004 Device 006: ID 1058:07a8 Western Digital Technologies, Inc. My Passport (WDBBEP), My Passport for Mac (WDBLUZ)
Bus 004 Device 005: ID 0bc2:ab31 Seagate RSS LLC Backup Plus Desktop Drive (5TB)
Bus 004 Device 004: ID 2109:0812 VIA Labs, Inc. VL812 Hub
Bus 004 Device 003: ID 2109:0812 VIA Labs, Inc. VL812 Hub
Bus 004 Device 002: ID 2109:0812 VIA Labs, Inc. VL812 Hub
Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 003 Device 005: ID 08bb:2902 Texas Instruments PCM2902 Audio Codec
Bus 003 Device 004: ID 28de:1142  
Bus 003 Device 003: ID 8087:0a2a Intel Corp. 
Bus 003 Device 002: ID 062a:4101 Creative Labs Wireless Keyboard/Mouse
Bus 003 Device 010: ID 2109:2812 VIA Labs, Inc. VL812 Hub
Bus 003 Device 009: ID 2109:2812 VIA Labs, Inc. VL812 Hub
Bus 003 Device 008: ID 05e3:0727 Genesys Logic, Inc. microSD Reader/Writer
Bus 003 Device 007: ID 0b33:0020 Contour Design, Inc. ShuttleXpress
Bus 003 Device 006: ID 2109:2812 VIA Labs, Inc. VL812 Hub
Bus 003 Device 011: ID 0d8c:0012 C-Media Electronics, Inc. 
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

$ lsmod |grep 'bt\|blue\|rfcomm\|bn'
rfcomm                 77824  4
bnep                   20480  2
btusb                  45056  0
btrtl                  16384  1 btusb
btbcm                  16384  1 btusb
btintel                16384  1 btusb
bluetooth             548864  33 btrtl,btintel,bnep,btbcm,rfcomm,btusb
ecdh_generic           24576  2 bluetooth
  • 2
    It is a well known issue. Please edit your question and add output of lspci -knn | grep Net -A3; lsusb terminal command. – Pilot6 Jul 27 '18 at 17:16
1

Bluetooth works on the same 2.4 GHz freq as Wi-Fi.

BT coexistence is bad in iwlwifi, but enabled by default.

Run

sudo tee /etc/modprobe.d/iwlwifi-opt.conf <<< "options iwlwifi bt_coex_active=N"

and reboot.

|improve this answer|||||
  • 1
    after running said command, the network actually will work while using BT headphones, however, network is still really slow. As soon as I turn off the headphones, everything goes back to full speed. any more suggestions? – Joshua Besneatte Jul 27 '18 at 17:41
  • No, that's all that can be done. It also depends on how many neighbors with AP you have. – Pilot6 Jul 27 '18 at 18:43
  • I have been reading around the net about bt/wifi and I am wondering if my cheap headphones are pre bt 1.2 and don't have afh.... do you know how I could determine this? – Joshua Besneatte Jul 27 '18 at 19:19

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