On Sat, 21 Mar 2020 at 17:55, Guillaume Martres <smarter@xxxxxxxxxx> wrote: > Since then, I was made aware of the existence of this patchset, after applying > this patch (and [3] which apparently only exists as v5 and not v6), my > headphones stopped sending zero-filled packets, but: > - the recorded audio quality is again extremely bad and robotic. > - when audio is being played, the headphones do not emit any sound. I figured out what the problem was: pulseaudio assumes an MTU of 48 but with this patch it now ends up being 60, I've left a comment on the pulseaudio MR [1]. After fixing this, audio input and output seem to be working correctly, however from time to time pulseaudio fails to decode an mSBC packet, but I don't know whose fault that is. [1]: https://gitlab.freedesktop.org/pulseaudio/pulseaudio/-/merge_requests/254#note_444249 On Sat, 21 Mar 2020 at 17:55, Guillaume Martres <smarter@xxxxxxxxxx> wrote: > > From: Guillaume Martres <smarter3@xxxxxxxxx> > > Hi Sathish, Marcel, > > > I would really prefer to have some Tested-by lines from people that can verify that this patch works. > > Here's my experience: a recent pulseaudio MR [1] added support for mSBC. When I > tried it using my laptop (Intel AX200) and headphones (Bose Headphone 700), the > voice quality was extremely bad. I eventually realized that this could be fixed > by ignoring all zero-filled packets sent by the headphones when decoding > mSBC [2], after that everything worked fine. > > Since then, I was made aware of the existence of this patchset, after applying > this patch (and [3] which apparently only exists as v5 and not v6), my > headphones stopped sending zero-filled packets, but: > - the recorded audio quality is again extremely bad and robotic. > - when audio is being played, the headphones do not emit any sound. > > Note that I applied this patchset on top of the current Ubuntu 20.04 kernel [4], > let me know if it's worth retesting on top of the mainline kernel, or if there > is something else I could try. > > Hope this helps, > Guillaume > > > [1]: https://gitlab.freedesktop.org/pulseaudio/pulseaudio/-/merge_requests/254 > [2]: https://gitlab.freedesktop.org/smarter/pulseaudio/-/commit/bb716b03002841e1092b4200935566d5c1a951fe > [3]: https://www.spinics.net/lists/linux-bluetooth/msg82149.html > [4]: https://git.launchpad.net/~ubuntu-kernel/ubuntu/+source/linux/+git/focal/commit/?h=Ubuntu-5.4.0-18.22&id=93dfa5b8e12fed29933f3451db44d88c0e4b5aed
