[alsa-devel] [USB-Audio - PX USB, playback] snd-usb-audio: probe of 2-3:1.0 failed with error -22 after kernel upgrade

[Mutz Heuer]

You are right, I did not switch to the master branch. The fix is on master
and I tested the daily ubuntu mainline kernel.

% uname -a                                       ✔  180  13:46:26
Linux ThinkPad-X220 4.19.0-999-lowlatency #201810312202 SMP PREEMPT Thu Nov
1 02:11:24 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux

That fixes the problem and I could drop the pulseaudio configuration also.

Currently happily listening to Berlin Philharmonic String Quintet: A.Dvorák
- String Quintet Op.77: I Allegro con fuoco – Più mosso 8-)

I updated the lauchpad bug (hopefully did the right things there).

Thanks a lot and sorry for the inconvenience,

Mutz

Takashi Iwai <tiwai at suse.de> schrieb am Di., 30. Okt. 2018 um 21:33 Uhr:

> On Tue, 30 Oct 2018 19:45:36 +0100,
> Mutz Heuer wrote:
> >
> > I checked the source code of quirks-table.h on branch 4.19-rc8.
>
> It's too old :)
>
> Linus git tree already contains more fixes, and the corresponding one
> is commit c369c8db15d51fa175d2ba85928f79d16af6b562
>
>
> Takashi
>
> > It still
> > contains the problematic workaround. It doesn't seem to fit any longer
> to the
> > headphones current firmware. Checking the 4.15.7 kernel (without the
> quirk)
> > works much better. At least the device is shown in the mixer and fixing
> the
> > samplerate to 48kHz leads to a useful configuration. To be honest I do
> not
> > really understand how to define a fixed table for supported sample rate
> > without fiddling with other parameters. The HID seems to working too. At
> least
> > I am able to use the headphone buttons to in/decrease the volume and to
> stop
> > and restart playback. The microphone is not shown - but that does not
> seem to
> > work on windows either - as far as I understand the orginal patch to
> support
> > the headphones.
> >
> > With the qurik in place I get no really helpful error messages ...
> >
> > I hope that helps to clarify the situation,
> >
> > Mutz
> >
> > Takashi Iwai <tiwai at suse.de> schrieb am Di., 30. Okt. 2018 um 12:24 Uhr:
> >
> >     On Sun, 28 Oct 2018 22:00:35 +0100,
> >     Mutz Heuer wrote:
> >     >
> >     > USB-Audio Connection on Bowers & Wilkens PX Bluetooth Headphones
> started
> >     > working when upgrading kernel from 4.13 to 4.15 series. Then it
> suddenly
> >     > stopped working again on newer kernels. The bug report has been
> >     generated
> >     > on the latest working mainline kernel 4.15.7. All newer kernels
> have
> >     some
> >     > usb quirks in place, which should fix the playback sample rates to
> 48
> >     kHz.
> >     > The quirk seems not to be working correctly - it seems to hinder
> the
> >     audio
> >     > system to recognize the USB-device as a sound device.
> >     >
> >     > The Headphones work on kernels before 4,15.7 when manually
> configuring
> >     > pulseaudio to a default samplerate of 48 kHz.
> >     >
> >     > PX Headphones are on the newest firmware level.
> >     >
> >     > See https://patchwork.kernel.org/patch/10265345/. Dropping that
> patch
> >     and
> >     > recompiling the kernel leads to a situation where alsa and
> pulseaudio
> >     seem
> >     > to to be working again.
> >     >
> >     > Adding
> >     >
> >     >       default-sample-rate = 48000
> >     >
> >     > to /etc/pulse/daemon.conf leads to working headphones.
> >     >
> >     > Maybe the patch has to be adjusted to newer firmware? A quirk
> seems to
> >     be
> >     > really necessary to avoid the specific patch to daemon.conf.
> >     >
> >     >
> >     > More details can be found in
> >     > https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1773697
> >     > What would be the best way to proceed?
> >
> >     Could you check the latest Linus git tree (or for-linus branch of
> >     sound git tree)?  The workaround for the buggy firmware was already
> >     included there.  Let me know if it still doesn't suffice.
> >
> >     thanks,
> >
> >     Takashi
> >
> >
>