Comment 0 for bug 1852785

--ubuntu release :
lsb_release -d
Description: Ubuntu 18.04.3 LTS

-- package :
apt show linux-firmware 2>&1 | grep -i "version:\|package:"
Package: linux-firmware
Version: 1.173.12

--hardware :
lspci -vnn | grep irel
03:00.0 Network controller [0280]: Intel Corporation Wireless 7260 [8086:08b1] (rev bb)
 Subsystem: Intel Corporation Dual Band Wireless-AC 7260 [8086:4070]
lsusb -d 8087:07dc
Bus 001 Device 003: ID 8087:07dc Intel Corp.

--problem :
The bluetooth part of the intel 7260 wifi/bluetooth card needs a firmware file to operate.
The version of my card is reported in dmesg as :

Bluetooth: hci0: read Intel version: 3707100180012d0d00

this will load firmware file

Bluetooth: hci0: Intel Bluetooth firmware file: intel/ibt-hw-37.7.10-fw-1.80.1.2d.d.bseq

When using a bluetooth headset the ad2p profile is supported but the hsp/hfp profile doesn't work, I believe the version in the current linux-firmawre package is patch version 39.

--solution :
Using the latest firmware with patch version 42 solves the problem :

https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git/commit/intel/ibt-hw-37.7.10-fw-1.80.1.2d.d.bseq?id=629a5e089e300ba153c1358cca2193a7671c2f80

With this firmware the hsp/hfp profile is working, this means the microphone and the sound of the bluetooth headset are working correctly.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: linux-firmware 1.173.12 [modified: lib/firmware/intel/ibt-hw-37.7.10-fw-1.80.1.2d.d.bseq]
ProcVersionSignature: Ubuntu 5.0.0-36.39~18.04.1-generic 5.0.21
Uname: Linux 5.0.0-36-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.9
Architecture: amd64
CurrentDesktop: XFCE
Date: Fri Nov 15 19:45:35 2019
Dependencies:

InstallationDate: Installed on 2016-05-10 (1284 days ago)
InstallationMedia: Xubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
PackageArchitecture: all
SourcePackage: linux-firmware
UpgradeStatus: Upgraded to bionic on 2019-09-18 (57 days ago)