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I have the following Problem: I have a headset which I want to connect via bluetooth - No problem (A2DP is just fine). But if I try to switch to the HSP/HFP profile I can't do this. It results in the 'Can not switch to HSP/HFP' error.

I have searched and tried many solutions but I can not make it work (I connected the Headphones via terminal, blueman, pavucontrol and so on. I even installed different linux distros hoping to use my Headset there). My Beyerdynamic Headset works fine on Windows - with the same bluetooth dongle, no need to say. Skype and discord calls are no problem there.

Here are the technical details:

0a12:0001 Cambridge Silicon Radio, Ltd Bluetooth Dongle (HCI mode) on Ubuntu 18.04 with 4.15.0-91-generic Kernel (also other OS like: Elementary 19.1)

Can anybody help me with that? I really like it to work on ubuntu but if I can not use my headset microphone I have to switch OS. :( Are there any experiences with this cambridge adapter? It seems to be the reason for troubles. Is there any newer/better firmware or drivers for this? It also seems to be no ubuntu error because connecting the headset on my ubuntu laptop and using HSP/HFP there works just fine. Any help, assumptions, tips and hints appreciated! Thank you!

EDIT:

Due to the answer of pbhj: I tried switching via the Graphical User Interface 1. In the Os settings 2. In Pavucontrol and also in commandline. The error messages where displayed there.

EDIT #2:

In the meantime I have found this thread. It looks like there is simply no solution for this problem. The bluetooth adapter is really fine if you just need audio output A2DP, because it is low cost. But no recommodation for headphone usage on Linux (On windows it works absolutely fine). :/

Bluetooth profile locked to A2DP (high-quality audio sink) but cannot change to HFP/HSP (low-quality bidirectional headset)

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  • Or are there any recommodations of usb bluetooth dongles which just work out of the box with HSP/HFP connecting headsets? – lfnnx lfnnx Apr 11 '20 at 12:37
  • I'm not familiar with your circumstances, but it would probably help if you say how you "switch" the profile and also where the "can not switch" error message is displayed. This, stackoverflow.com/q/45485365/383694, might give you a usable answer. If it does then you can post what you did here as an answer to your own question. – pbhj Apr 11 '20 at 22:14
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    @pbhj I edited the question. Thank you for your fast response! I have already seen that question on stackoverflow and tried everything discribed there a few weeks ago... : / – lfnnx lfnnx Apr 12 '20 at 17:27
  • I think I might have the same problem as you. I have the same USB dongle adapter: 0a12:0001 Cambridge Silicon Radio, Ltd Bluetooth Dongle (HCI mode). I have a Sony WH-1000XM3 which I can connect via bluetooth but only via the A2DP profile. I can't change profiles either. I run Arch linux with: 5.6.5-arch3-1 – Lucas Rouckhout Apr 24 '20 at 8:00
  • Same problem . Using bluetooth earbuds MPOW M9. Earbuds works great with android and iOS. – sillo01 Mar 6 at 0:08

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