Geraldo - here is the dmesg output when starting up jackd for capture/playback: With my patch: [ 136.734081] usb 3-1.2: Open EP 0x8e, iface=2:1, idx=0 [ 136.734088] usb 3-1.2: channels=2, rate=44100, format=S32_LE, period_bytes=256, periods=2, implicit_fb=0 [ 136.734092] usb 3-1.2: Setting usb interface 2:0 for EP 0x8e [ 136.734233] usb 3-1.2: Setting usb interface 2:1 for EP 0x8e [ 136.734381] usb 3-1.2: 2:1 Set sample rate 44100, clock 0 [ 136.734388] usb 3-1.2: Setting params for data EP 0x8e, pipe 0x70480 [ 136.734394] usb 3-1.2: Set up 12 URBS, ret=0 [ 136.734466] usb 3-1.2: Open EP 0xd, iface=1:1, idx=0 [ 136.734468] usb 3-1.2: channels=2, rate=44100, format=S32_LE, period_bytes=256, periods=2, implicit_fb=1 [ 136.734471] usb 3-1.2: Reopened EP 0x8e (count 1) [ 136.734473] usb 3-1.2: Setting usb interface 1:0 for EP 0xd [ 136.734605] usb 3-1.2: Setting usb interface 1:1 for EP 0xd [ 136.734762] usb 3-1.2: 1:1 Set sample rate 44100, clock 0 [ 136.734774] usb 3-1.2: Setting params for data EP 0xd, pipe 0x68400 [ 136.734781] usb 3-1.2: Set up 12 URBS, ret=0 [ 136.734830] usb 3-1.2: Starting data EP 0xd (running 0) [ 136.734873] usb 3-1.2: 12 URBs submitted for EP 0xd [ 136.734876] usb 3-1.2: Starting data EP 0x8e (running 0) [ 136.734906] usb 3-1.2: 12 URBs submitted for EP 0x8e [ 136.740627] usb 3-1.2: Starting data EP 0x8e (running 1) [ 136.740634] usb 3-1.2: 2:1 Start Capture PCM [ 136.740635] usb 3-1.2: 1:1 Start Playback PCM With the unpatched kernel: [ 344.813203] usb 3-1.2: Open EP 0x8e, iface=2:1, idx=0 [ 344.813210] usb 3-1.2: channels=2, rate=44100, format=S32_LE, period_bytes=256, periods=2, implicit_fb=1 [ 344.813213] usb 3-1.2: Open EP 0xd, iface=1:1, idx=0 [ 344.813215] usb 3-1.2: channels=2, rate=44100, format=S32_LE, period_bytes=256, periods=2, implicit_fb=0 [ 344.813217] usb 3-1.2: Setting usb interface 2:0 for EP 0x8e [ 344.813367] usb 3-1.2: Setting usb interface 2:1 for EP 0x8e [ 344.813494] usb 3-1.2: 2:1 Set sample rate 44100, clock 0 [ 344.813503] usb 3-1.2: Setting params for data EP 0x8e, pipe 0x70580 [ 344.813509] usb 3-1.2: Set up 12 URBS, ret=0 [ 344.813513] usb 3-1.2: Setting usb interface 1:0 for EP 0xd [ 344.813587] usb 3-1.2: Setting usb interface 1:1 for EP 0xd [ 344.813758] usb 3-1.2: 1:1 Set sample rate 44100, clock 0 [ 344.813765] usb 3-1.2: Setting params for data EP 0xd, pipe 0x68500 [ 344.813770] usb 3-1.2: Set up 2 URBS, ret=0 [ 344.813858] usb 3-1.2: Reopened EP 0xd (count 1) [ 344.813883] usb 3-1.2: Starting data EP 0xd (running 0) [ 344.813899] usb 3-1.2: 2 URBs submitted for EP 0xd [ 344.819499] usb 3-1.2: Starting data EP 0x8e (running 0) [ 344.819532] usb 3-1.2: 12 URBs submitted for EP 0x8e [ 344.819535] usb 3-1.2: Starting data EP 0xd (running 1) [ 344.819538] usb 3-1.2: 2:1 Start Capture PCM [ 344.819540] usb 3-1.2: 1:1 Start Playback PCM [ 344.820663] usb 3-1.2: Stopping data EP 0xd (running 2) [ 344.820688] usb 3-1.2: Stopping data EP 0x8e (running 1) [ 344.820693] usb 3-1.2: 2:1 Stop Capture PCM [ 344.820695] usb 3-1.2: Stopping data EP 0xd (running 1) [ 344.820697] usb 3-1.2: 1:1 Stop Playback PCM [ 344.833799] usb 3-1.2: Starting data EP 0xd (running 0) [ 344.833852] usb 3-1.2: 2 URBs submitted for EP 0xd [ 344.833867] usb 3-1.2: Starting data EP 0x8e (running 0) [ 344.833888] usb 3-1.2: 12 URBs submitted for EP 0x8e [ 344.833890] usb 3-1.2: Starting data EP 0xd (running 1) [ 344.833891] usb 3-1.2: 2:1 Start Capture PCM [ 344.833893] usb 3-1.2: 1:1 Start Playback PCM On Wed, Apr 7, 2021 at 1:30 PM Geraldo Nascimento <geraldogabriel@xxxxxxxxx> wrote: > Em Qua, 7 de abr de 2021 17:16, Mike Oliphant <oliphant@xxxxxxxxxxxx> > escreveu: > >> Hi Geraldo - I don't have that patch applied, but it shouldn't make any >> behavioral difference - it just seems to be simplifying the code. >> > > Point taken. > > >> The issue is that the BOSS GT-1 *does* need implicit feedback on playback >> to avoid clock timing issues, and the current behavior is disabling that >> feedback. >> > > Mike, would you mind posting some dyndbg logs for both the stock behaviour > and your endpoint.c/generic quirk modified behaviour? > > Just add snd_usb_audio.dyndbg=+p to your kernel options and please share > the logs. > > >> Mike >> >> On Wed, Apr 7, 2021 at 1:04 PM Geraldo Nascimento < >> geraldogabriel@xxxxxxxxx> wrote: >> >>> Hey Mike, did you catch the latest patch by Takashi Iwai for capture >>> quirky devices? >>> >>> You can find it here: >>> https://patchwork.kernel.org/project/alsa-devel/patch/20210406113837.32041-1-tiwai@xxxxxxx/ >>> >>> Em Qua, 7 de abr de 2021 16:55, Mike Oliphant <oliphant@xxxxxxxxxxxx> >>> escreveu: >>> >>>> I had thought that the recent implicit feedback changes were fully >>>> working >>>> on the BOSS GT-1, but it turns out that I just hadn't tested well >>>> enough. >>>> >>>> Audio playback and capture works, but with periodic dropouts. I get the >>>> exact same behavior as I did with the quirk to completely disable >>>> implicit >>>> feedback. Without the implicit feedback, you get dropouts from clock >>>> drift >>>> - how bad probably varies from card to card. On mine it is every second >>>> or >>>> so. >>>> >>>> If I switch playback feedback for the GT-1 to generic by doing >>>> "IMPLICIT_FB_GENERIC_DEV(0x0582, 0x01d6)", I get the previous old >>>> behavior, >>>> which is that playback completely fails to start. >>>> >>>> With generic playback feedback, and using my previous patch to >>>> endpoint.c >>>> to avoid playback waiting on capture mentioned here: >>>> >>>> >>>> https://mailman.alsa-project.org/pipermail/alsa-devel/2020-January/161951.html >>>> >>>> playback and capture work perfectly for me. >>>> >>>
