![]() (_handle_irq_event_percpu) from (handle_irq_event_percpu+0x3c/0x90) (usb_hcd_irq) from (_handle_irq_event_percpu+0xa8/0x268) (dwc2_hcd_select_transactions ) from (dwc2_handle_hcd_intr+0x240/0圆9c ) (dwc2_assign_and_init_hc ) from (dwc2_hcd_select_transactions+0xb0/0x1a4 ) (warn_slowpath_fmt) from (dwc2_assign_and_init_hc+0x8a8/0x954 ) (show_stack) from (dump_stack+0xcc/0xf8) (dump_backtrace) from (show_stack+0x20/0x24) Modules linked in: cmac bnep hci_uart btbcm bluetooth ecdh_generic ecc 8021q garp stp llc joydev snd_usb_audio snd_hwdep snd_usbmidi_lib snd_rawmidi snd_seq_device brcmfmac brcmutil sha256_generic cfg80211 rfkill v3d gpu_sched vc4 cec drm_kms_helper bcm2835_v4l2(C) raspberrypi_hwmon drm dwc2 videobuf2_vmalloc roles drm_panel_orientation_quirks bcm2835_isp(C) snd_soc_core bcm2835_codec(C) v4l2_mem2mem bcm2835_mmal_vchiq(C) videobuf2_dma_contig videobuf2_memops videobuf2_v4l2 videobuf2_common snd_compress snd_bcm2835(C) snd_pcm_dmaengine snd_pcm videodev vc_sm_cma(C) snd_timer mc snd syscopyarea sysfillrect sysimgblt fb_sys_fops backlight rpivid_mem uio_pdrv_genirq uio ip_tables x_tables ipv6 Which OS and version ( cat /etc/rpi-issue)?.Which model of Raspberry Pi? PiCM4 + CM4 I/O.The audio crackles a lot, the white noise reproduced from speaker-test is really distorted. To reproduce correctly also the 44100Hz-24bit audio format. Where hw:1,0 is the index of the usb sound card read from aplay -l. I run the following command to reproduce the issue: I think there could be a problem in the dwc2 usb controller of the CM4. I have also tried to use Volumio (kernel 4.x.x) on the CM4 but the same problem persists. If I connect the same sound card to a RasPi 2 with the same RasPiOS, all audio formats reproduce correctly. The other audio formats supported by the sound card (included 44100Hz - 16bit) reproduce correctly. I have really bad crackling sound when I try to reproduce 44100Hz - 24bit audio format on a C-Media USB sound card connected to a RasPi CM4 + CM4 I/O board.
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