On Wed, 22 Jun 2022 11:45:22 +0000 Zala Pierre GOUPIL via Alsa-user <alsa-user@xxxxxxxxxxxxxxxxxxxxx> wrote: > I don't know which compilation option is missing this time but I have > a problem accessing a Bluetooth headset: I can pair and trust it but > the only connection to it that is proposed to me is through the > serial port of the headset. Needless to say that no sound is produced > here. You're not alone in compiling your own kernels… Bluetooth is a bit of a strange beast, the host controllers have kernel drivers, but for things like peripherals, there's a userspace driver stack called BlueZ that talks to the peripheral. There are three ways I know of to access audio devices in this manner: 1. PulseAudio BlueZ plug-in: this has been the "official" way for some time now. A2DP is pretty mature, but I find I only get low-quality audio when used full-duplex. 2. PipeWire BlueZ plug-in: Experimental, combines features of both PulseAudio and JACK (which is real nice), but there are some sharp edges. PipeWire is steadily improving however, and features CODECs that provide better quality audio CODECs on Bluetooth. 3. Bluez-ALSA: Skips the user-space media stack and links ALSA directly up to BlueZ. Haven't tried it in a looong time, the latest version is a re-write of the earlier attempt. I'm having reasonably good results with (2). With some coaxing, you can get headsets to operate in mSBC mode when being used full-duplex, which yields somewhat improved audio quality over the standard telephone-quality audio usually available. (3) is apparently landing in Debian 12 if that's the distribution you use. It is in the Gentoo portage tree. Not sure about Red Hat/Fedora derivatives. I note Ubuntu 22.04 seemed to ship PipeWire, so it may be starting to replace PulseAudio already. -- Stuart Longland (aka Redhatter, VK4MSL) I haven't lost my mind... ...it's backed up on a tape somewhere. _______________________________________________ Alsa-user mailing list Alsa-user@xxxxxxxxxxxxxxxxxxxxx https://lists.sourceforge.net/lists/listinfo/alsa-user
