Regression in Intel AX201 firmware (bluetooth) #57670
Description
Is this a new report?
Yes
System Info
Void 6.12.54_1 x86_64 GenuineIntel notuptodate rrrrFF
Package(s) Affected
linux-firmware-network-20250917_1
Does a report exist for this bug with the project's home (upstream) and/or another distro?
No response
Expected behaviour
Connect to headphones via bluetooth, play anything with mpv/firefox-youtube/mythtv via alsa or pipewire.
Actual behaviour
Connection is sporadic, quality is poor - halts and stammers.
Laptop is a Dell Latitude 3120 probably manufactured in 2021
Chip is an Intel AX201, lsusb gives:
Bus 001 Device 005: ID 8087:0026 Intel Corp. AX201 Bluetooth
I found that booting an old Mint USB stick worked fine so I thought to try an older version of the firmware:
From dmesg I found that the firmware is /lib/firmware/intel/ibt-19-0-0.sfi and ibt-0040-0041.ddc
The Mint 8 version of the firmware is 249-27.23
The Void version is 193-33.24 (ie 2024 and newer)
Get the correct 2023 firmware files:
cd /tmp
wget https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git/plain/intel/ibt-19-0-0.sfi?h=20231030 -O ibt-19-0-0.sfi.20231030.249-27.23
wget https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git/plain/intel/ibt-0040-0041.ddc?h=20231030 -O ibt-0040-0041.ddc.20231030.249-27.23
sudo cp /lib/firmware/intel/ibt-19-0-0.sfi /lib/firmware/intel/ibt-19-0-0.sfi.193-33.24
sudo cp /lib/firmware/intel/ibt-0040-0041.ddc /lib/firmware/intel/ibt-0040-0041.ddc.193-33.24
sudo cp ibt-19-0-0.sfi.20231030.249-27.23 /lib/firmware/intel/ibt-19-0-0.sfi
sudo cp ibt-0040-0041.ddc.20231030.249-27.23 /lib/firmware/intel/ibt-0040-0041.ddc
sudo reboot
bluetooth (& wifi) work perfectly with the older firmware.
I thought I might post to kernel.org - but that instructs us to post against our distro. Nevertheless, I posted this one: https://bugzilla.kernel.org/show_bug.cgi?id=220703