[Letux-kernel] Fixing Audio driver

Michael Mrozek EvilDragon at openpandora.org
Thu May 23 01:32:34 CEST 2019

On Mi, 2019-05-22 at 19:53 +0200, H. Nikolaus Schaller wrote:


> > ALSA reports 7 output devices. Accessing some of them leads to a
> > kernel lock.
> Some are additional sound cards for:
> * bluetooth audio
> * LTE modem voice channel
> These do not work if the respective clock is missing. This is not yet
> debugged and therefore never did work.

I'm a bit puzzled here.
On all my Linux systems, the bluetooth audio volume controls only pop
up when I have a bluetooth audio device connected.

Otherwise, they don't exist and are not listed in alsa or pulseaudio.
The same should be the case for LTE unless the modem is initialized.

Is the TWL even needed for Bluetooth Audio / LTE?
I don't know how this works, but I always thought bluetooth audio is
independent of the sound card in a system.
At least, from what I found on the internet, bluetooth audio is not
affected by the sound card and it also works without any soundcard


Michael Mrozek

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