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Groups > linux.debian.kernel > #59533

Bug#878165: firmware-iwlwifi: Some firmware versions cause 8260 Bluetooth malfunction

Cross-posted to 2 groups.

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Package: firmware-iwlwifi
Version: 20170823-1
Followup-For: Bug #878165

Hi,

I can confirm this bug, it's root cause seems to be interference between 2.4GHz
wifi and bluetooth.

In my case, I have 2 wifi networks in range, one in 5GHz range and the other in
2.4GHz range. My main network is the 5GHz one, and while connected to it
there's no problem with my bluetooth mouse. However, from time to time the
laptop roams to the 2.4GHz one and there appears the interference.

With firmware-iwlwifi's version 20170823-1 (which contains firmware v31 of
iwlwifi-8000C), the bluetooth mouse is inmediately disconnected and the only
way to reconnect is to reboot the laptop. Note that connecting back to the 5GHz
network doesn't solve the problem, it seems that the bluetooth stack somehow
gets stuck.

On the other hand, version 20161130-3 contais v28 of the firmware. In this
case, connecting to a 2.4GHz network causes some interference with the mouse
(mainly erratic movements), but after completing the connection both radios can
coexist (although there is some interference from time to time). Connecting
back to 5GHz restores everything to normal.

There's a newer version (v34) of the firmware in the kernel's github, but
unfortunately current Debian's kernel doesn't support it.

For the time being, it seems that our best solution is to force loading v28 of
the firmware, either by:
- downgrading firmware-iwlwifi to 20161130-3 or
- manually removing /lib/firmware/iwlwifi-8000C.ucode-31.ucode, so the system
will fall back to v28 instead or
- somehow instruct the kernel to prefer v28 over v31, but I don't know if that
can be done

Regards.



-- System Information:
Debian Release: buster/sid
  APT prefers stable-updates
  APT policy: (500, 'stable-updates'), (500, 'testing'), (500, 'stable')
Architecture: amd64 (x86_64)

Kernel: Linux 4.13.0-1-amd64 (SMP w/4 CPU cores)
Locale: LANG=es_ES.UTF-8, LC_CTYPE=es_ES.UTF-8 (charmap=UTF-8), LANGUAGE=es_ES.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

firmware-iwlwifi depends on no packages.

firmware-iwlwifi recommends no packages.

Versions of packages firmware-iwlwifi suggests:
ii  initramfs-tools  0.130

-- no debconf information

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Bug#878165: firmware-iwlwifi: Some firmware versions cause 8260 Bluetooth malfunction Tony Houghton <h@realh.co.uk> - 2017-10-13 01:10 +0200
  Bug#878165: firmware-iwlwifi: Some firmware versions cause 8260 Bluetooth malfunction Antonio Trueba Gayol <atgayol@gmail.com> - 2017-12-02 20:40 +0100
  Bug#878165: Fix upstream Alejandro Lorenzo Gallego <alejandro_aero@yahoo.es> - 2017-12-13 00:50 +0100
    Bug#878165: Fixed upstream, update package Antonio Trueba Gayol <atgayol@gmail.com> - 2018-07-08 09:30 +0200
  Bug#878165: marked as done (firmware-iwlwifi: Some firmware  versions cause 8260 Bluetooth malfunction) "Debian Bug Tracking System" <owner@bugs.debian.org> - 2021-03-14 16:40 +0100

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