*** This bug is a duplicate of bug 1871794 ***
    https://bugs.launchpad.net/bugs/1871794

hi @thiagocmarcello

Sorry to hear that...
The day my headset all of a sudden started working, ie. 2020-09-16, it happened 
right after my dayly sudo apt-get update...

Must have been another package that dealt with it...
As a matter a fact, the linux kernel update took place on 2020-09-01...
Must have been distracted

Here is the list of updates I had that day:

fdisk:amd64 (2.34-0.1ubuntu9, 2.34-0.1ubuntu9.1), cryptsetup-bin:amd64 
(2:2.2.2-3ubuntu2, 2:2.2.2-3ubuntu2.2), cry
ptsetup-initramfs:amd64 (2:2.2.2-3ubuntu2, 2:2.2.2-3ubuntu2.2), 
firmware-manager-notify:amd64 (0.1.1~1585248044~20.04~5b047
86, 0.1.1~1599764521~20.04~f6b394a), uuid-runtime:amd64 (2.34-0.1ubuntu9, 
2.34-0.1ubuntu9.1), libfdisk1:amd64 (2.34-0.1ubun
tu9, 2.34-0.1ubuntu9.1), popsicle-gtk:amd64 (1.1.0~1596832906~20.04~903614f, 
1.1.0~1600184897~20.04~c093c67), libmount1:amd
64 (2.34-0.1ubuntu9, 2.34-0.1ubuntu9.1), libpop-upgrade-gtk:amd64 
(0.1.0~1598294830~20.04~eb2eb9d, 0.1.0~1600134377~20.04~9
c2a95e), popsicle:amd64 (1.1.0~1596832906~20.04~903614f, 
1.1.0~1600184897~20.04~c093c67), gir1.2-accountsservice-1.0:amd64 
(0.6.55-0ubuntu12~20.04.1pop0, 0.6.55-0ubuntu12pop0~1599854970~20.04~bfe7ef3), 
util-linux:amd64 (2.34-0.1ubuntu9, 2.34-0.1ubuntu9.1), libgupnp-1.2-0:amd64 
(1.2.2-1, 1.2.3-0ubuntu0.20.04.1), cryptsetup-run:amd64 (2:2.2.2-3ubuntu2, 
2:2.2.2-3ubuntu2.2), initramfs-tools-bin:amd64 (0.136ubuntu6.2, 
0.136ubuntu6.3), libmount-dev:amd64 (2.34-0.1ubuntu9, 2.34-0.1ubuntu9.1), 
mount:amd64 (2.34-0.1ubuntu9, 2.34-0.1ubuntu9.1), libblkid1:amd64 
(2.34-0.1ubuntu9, 2.34-0.1ubuntu9.1), im-config:amd64 (0.44-1ubuntu1.1, 
0.44-1ubuntu1.2), libuuid1:amd64 (2.34-0.1ubuntu9, 2.34-0.1ubuntu9.1), 
libsmartcols1:amd64 (2.34-0.1ubuntu9, 2.34-0.1ubuntu9.1), rfkill:amd64 
(2.34-0.1ubuntu9, 2.34-0.1ubuntu9.1), uuid-dev:amd64 (2.34-0.1ubuntu9, 
2.34-0.1ubuntu9.1), bsdutils:amd64 (1:2.34-0.1ubuntu9, 1:2.34-0.1ubuntu9.1), 
libgssdp-1.2-0:amd64 (1.2.2-1, 1.2.3-0ubuntu0.20.04.1), 
libfirmware-manager:amd64 (0.1.1~1585248044~20.04~5b04786, 
0.1.1~1599764521~20.04~f6b394a), libcryptsetup12:amd64 (2:2.2.2-3ubuntu2, 
2:2.2.2-3ubuntu2.2), linux-firmware:amd64 
(1.187.1+system76~1597425559~20.04~3cf919d, 
1.190+system76~1599667136~20.04~5b2179a), pop-shell:amd64 
(0.1.0~1599583364~20.04~017c92e, 0.1.0~1600180966~20.04~e5a80ea), 
accountsservice:amd64 (0.6.55-0ubuntu12~20.04.1pop0, 
0.6.55-0ubuntu12pop0~1599854970~20.04~bfe7ef3), pop-upgrade:amd64 
(0.1.0~1598294830~20.04~eb2eb9d, 0.1.0~1600134377~20.04~9c2a95e), 
libblkid-dev:amd64 (2.34-0.1ubuntu9, 2.34-0.1ubuntu9.1), cryptsetup:amd64 
(2:2.2.2-3ubuntu2, 2:2.2.2-3ubuntu2.2), firmware-manager-shared:amd64 
(0.1.1~1585248044~20.04~5b04786, 0.1.1~1599764521~20.04~f6b394a), 
initramfs-tools-core:amd64 (0.136ubuntu6.2, 0.136ubuntu6.3), 
initramfs-tools:amd64 (0.136ubuntu6.2, 0.136ubuntu6.3), 
libaccountsservice0:amd64 (0.6.55-0ubuntu12~20.04.1pop0, 
0.6.55-0ubuntu12pop0~1599854970~20.04~bfe7ef3), pop-shell-shortcuts:amd64 
(0.1.0~1599143748~20.04~069276a, 0.1.0~1599845228~20.04~9280535)

(from /var/log/apt/history.log)

Hope someone smarter than me will figure out which package did unlock
the HSP/HFP profile...

dGo

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https://bugs.launchpad.net/bugs/1878194

Title:
  [Sennheiser HD 4.50 BTNC] Bluetooth headset not working when selecting
  HSP/HFP audio profile in Focal Fossa

Status in bluez package in Ubuntu:
  Confirmed
Status in pulseaudio package in Ubuntu:
  Confirmed

Bug description:
  After updating the release from Ubuntu 19.10 to 20.04, the bluetooth
  headset doesn't work anymore when HSP/HFP profile is selected.

  With Ubuntu 19.10 the headset was working, there was audio and the mic
  was perfect for video conferencing.

  [Steps to reproduce]
  1. Connect headset (used blueman to setup and connect)
  1.1. When connected the system automatically selects A2DP profile
  2. Start playing audio (browser or other)
  3. Change profile to HSP/HFP with pavucontrol (or blueman)
  4. The audio disappears and microphone is not working (no input)
  5. Optionally switch back to A2DP and the audio comes back

  [Expected]
  When switching to HSP/HFP the audio should keep playing and the microphone 
should start working

  [Notes]
  I tried with pavucontrol to switch between profiles while playing audio from 
a browser.
  As side note there's a led in the headset that still blinks when switching 
profile.

  I tried deleting the pulse folder under user's profile .config without
  success, also reinstalled packages and did a `sudo alsa force-reload`
  and rebooting several times.

  Note: not sure this is a duplicate of [Bug #1576559], it looks quite
  different since the profile changes but the headset stops working.

  [System info]
  Ubuntu: 20.04 - Linux 5.4.0-29-generic x86_64
  pulseaudio: 1:13.99.1-1ubuntu3
  bluez: 5.53-0ubuntu3

  Headset: Sennheiser HD 4.50 BTNC

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