When Yamaha THR5 is used as a USB audio interface, playback produces a popping sound every few seconds. Here is an example capture with a 100 Hz tone playing in the background: https://drive.google.com/file/d/1ZVatviBvHuarDIGIy8AoJiYbwEpOedn4/view?usp=drive_link A workaround is to force implicit feedback mode with 'snd-usb-audio.implicit_fb=1'. I have tested that recording still works with this option enabled. Without 'implicit_fb', the device lacks a feedback source. I wrote a patch to snd-usb-audio quirks to enable implicit FB for the THR5. I have attached the following outputs from 'alsa-info': - alsa-info.txt - Stock Ubuntu 24.04.1 system - alsa-info-implicit-fb.txt - Ubuntu 24.04.1 + linux-sound 6.12.0-rc7 + implicit FB patch applied for THR5 This problem only seems to reproduce on certain hardware combinations. Affected host system: - Motherboard: ASRock B650i Lightning Wifi - CPU: AMD Ryzen 7950X3D - Memory: 64 GB DDR5 6000 MHz - OS: Ubuntu 24.04.1 / kernel 6.8.0-49-generic Additionally, the following systems were tested (stock kernel unless noted): - Buggy: - ASRock B650i Lightning Wifi + Ubuntu 24.04.1 linux-sound 6.12.0-rc7 + Yamaha THR5 - ASRock B650i Lightning Wifi + Ubuntu 20.04.6 + Yamaha THR5 - Working: - ThinkPad X1 Carbon Gen7 + Ubuntu 24.04.1 + Yamaha THR5 - ASUS VivoPC X Intel® Core™ i5 7300HQ + Ubuntu 24.04.1 + Yamaha THR5 - ASRock B650i Lightning Wifi + Windows 11 + Yamaha THR5 - ASRock B650i Lightning Wifi + Ubuntu 24.04.1 + Boss Katana Air The tests were conducted using 'aplay' with a 100 Hz tone @ 44.1 kHz with no other workload running except the Ubuntu desktop. I have not spotted any errors or warnings in system or user journal, or 'aplay' output, during playback. I used the following configuration to increase logging verbosity: - 'echo "file sound/* +p" > /sys/kernel/debug/dynamic_debug/control' - 'echo 8 > /proc/sys/kernel/printk' - Enable CONFIG_SND_DEBUG + CONFIG_SND_PCM_XRUN_DEBUG + /proc/asound/card*/pcm*/xrun_debug Troubleshooting attempts (unsuccessful): - Increase Pipewire quantum settings - Disable Pipewire and use ALSA directly, incl. with large 'buffer_size' in ALSA config - Try all quirk flags in snd-usb-audio (the implicit FB flag ofc. helps) - Try the Performance / Balanced / Power Save profile settings in Ubuntu I believe some other Yamaha THR series devices may be affected as well, eg. the THR10: see https://linuxmusicians.com/viewtopic.php?p=164262
Created attachment 307325 [details] alsa-info output with stock Ubuntu 24.04.1 kernel
Created attachment 307326 [details] alsa-info output with Ubuntu 24.04.1 + linux-sound 6.12.0-rc7 + patch
Created attachment 307327 [details] Patch to add implicit FB quirk for Yamaha THR5
The patch looks good. Could you submit it to ML (linux-sound@vger.kernel.org) with Cc to me? Then we'll review and merge to the upstream. TIA!
The fix patch got merged to sound git tree, to be included in 6.13-rc3.
Joseph Klitzke 2/21/2025 I found no change to the popping issue using the snd_usb_audio.implicit_fb=1 I tested it on the THR30II and the THR10 Tested it on a 5.10 kernel and a 6.9 kernel no difference. Is there a way to make changes to the code without recompiling the kernel? IS making changes to the quirks.c file any diff than using snd_usb_audio.implicit_fb=1 I'm happy to work with however to test changes . I have the THR30II THR10 THR10C THR10X THR5A AMPS. Fixing one will probably fix all.