Hi, recently I've bought a usb webcam with integrated mic: Jieli Technology USB PHY 2.0 (1224:2a25) The video part works well, but the mic sound is speedups, "like minions" (cit.). When I connect the camera, these are the dmesg messages: kernel: usb 1-8: current rate 0 is different from the runtime rate 8000 kernel: usb 1-8: current rate 0 is different from the runtime rate 16000 kernel: usb 1-8: current rate 0 is different from the runtime rate 44100 kernel: usb 1-8: current rate 0 is different from the runtime rate 48000 kernel: usb 1-8: Warning! Unlikely big volume range (=4096), cval->res is probably wrong. kernel: usb 1-8: [3] FU [Mic Capture Volume] ch = 1, val = 0/4096/1 kernel: usbcore: registered new interface driver snd-usb-audio and after a while, dmesg log is filled, every 5 seconds, with: kernel: retire_capture_urb: 84 callbacks suppressed kernel: retire_capture_urb: 1714 callbacks suppressed A guy reports on ArchLinux bug website the same problem (https://bugs.archlinux.org/task/68141?opened=12995&status%5B0%5D=) and provides a patch to fix the sound issue. I've applied the patch on kernel 5.9.13 (Fedora 33 x86_64) and now the mic works, no more minions voice effect. Now dmesg messages are only: kernel: usb 1-8: Warning! Unlikely big volume range (=4096), cval->res is probably wrong. kernel: usb 1-8: [3] FU [Mic Capture Volume] ch = 1, val = 0/4096/1 kernel: usbcore: registered new interface driver snd-usb-audio the retire_capture_urb messages are gone. All credits for the patch go to him but I don't know how to contact that guy nor I don't know if he has already contacted you, so my question is if you could review his patch and finally apply upstream. If you need other information or you need a tester, I'm here. Thanks, Marco --- a/sound/usb/format.c 2020-10-01 18:36:35.000000000 +0300 +++ b/sound/usb/format.c 2020-10-04 02:10:21.678685952 +0300 @@ -217,6 +217,21 @@ (chip->usb_id == USB_ID(0x041e, 0x4064) || chip->usb_id == USB_ID(0x041e, 0x4068))) rate = 8000; + + // hack for "Jieli Technology USB PHY 2.0" webcam + if (chip->usb_id == USB_ID(0x1224, 0x2a25)) { + switch (rate) { + case 8000: + fp->datainterval += 4; + break; + case 16000: + fp->datainterval += 3; + break; + default: + fp->datainterval += 1; + break; + } + } fp->rate_table[fp->nr_rates] = rate; if (!fp->rate_min || rate < fp->rate_min) --- a/sound/usb/endpoint.c 2020-10-01 18:36:35.000000000 +0300 +++ b/sound/usb/endpoint.c 2020-10-04 02:09:09.471978982 +0300 @@ -882,6 +882,8 @@ if (snd_usb_get_speed(ep->chip->dev) != USB_SPEED_FULL) { packs_per_ms = 8 >> ep->datainterval; max_packs_per_urb = MAX_PACKS_HS; + if (!packs_per_ms) + packs_per_ms = 1; } else { packs_per_ms = 1; max_packs_per_urb = MAX_PACKS; --- a/sound/usb/quirks.c 2020-10-01 18:36:35.000000000 +0300 +++ b/sound/usb/quirks.c 2020-10-04 02:14:04.532196519 +0300 @@ -1516,6 +1516,7 @@ case USB_ID(0x1901, 0x0191): /* GE B850V3 CP2114 audio interface */ case USB_ID(0x21b4, 0x0081): /* AudioQuest DragonFly */ case USB_ID(0x2912, 0x30c8): /* Audioengine D1 */ + case USB_ID(0x1224, 0x2a25): /* Jieli Technology USB PHY 2.0 */ return true; }
