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@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@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 Headphonesstarted
> working when upgrading kernel from 4.13 to 4.15 series. Then itsuddenly
> stopped working again on newer kernels. The bug report has been generated > on the latest working mainline kernel 4.15.7. All newer kernelshave
some > usb quirks in place, which should fix the playback sample rates to48
kHz. > The quirk seems not to be working correctly - it seems to hinderthe
audio > system to recognize the USB-device as a sound device. > > The Headphones work on kernels before 4,15.7 when manuallyconfiguring
> pulseaudio to a default samplerate of 48 kHz. > > PX Headphones are on the newest firmware level. > > See https://patchwork.kernel.org/patch/10265345/. Dropping thatpatch
and > recompiling the kernel leads to a situation where alsa andpulseaudio
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 quirkseems 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