I want to use a Rodecaster Pro mixer to run my audio. It runs fine on my laptop, but not on my desktop (both running Ubuntu 20.04 with kernel 5.8.18).

On my desktop, the input from microphones are working, but sound output is played very slow and distorted as if sampled down - interestingly media playback e.g. from YouTube is slowed down on my screen as well. Never seen something like that before :-)

tl;dr

Meanwhile, I have filed a bug report at https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/1927255

Currently, the best hint I have and that I am investigating: The Rodecaster Pro seems be able to handle audio set to 24bit, 48kHz only. While the Linux kernel sets the 48kHz in some extra quirk handler for the Rodecaster Pro, I assume that I need to reconfigure ALSA in some way to meet the 24bit requirement (although I don't know why it's working on my laptop without any problems, just not on my desktop).

Current status: I have been trying to play a wav (encoded in 48000kHz in PCM 32 bit little endian format) sample via aplay using

aplay -f S32_LE -c 2 -r 48000 -D hw:x ~/sample.wav

where x is the appropriate card number and the rest of the arguments meet the Rodecaster's specification. It's playing fine on the laptop, but distorted on the desktop. It is possible that on one of them, ALSA is doing or not doing some resampling (either breaking something on the desktop or fixing something on the laptop)? As far as I understand, this should not be the case since I am not using the plug plugin, correct? So, must there be something happening between ALSA and the Rodecaster, probably something USB related?

Observations

I have more details down below, but the most likely hint that I have so far comes from running dmesg -w on both my machines when plugging in the Rodecaster. The output is:

desktop

[  156.337116] usb 1-4: new high-speed USB device number 6 using xhci_hcd

[  156.517968] usb 1-4: New USB device found, idVendor=19f7, idProduct=0011, bcdDevice= 2.11

[  156.517972] usb 1-4: New USB device strings: Mfr=1, Product=2, SerialNumber=3

[  156.517975] usb 1-4: Product: RODECaster Pro

[  156.517976] usb 1-4: Manufacturer: RODE Microphones

[  156.517978] usb 1-4: SerialNumber: 00000000001A

[  156.539362] hid-generic 0003:19F7:0011.0006: hiddev3,hidraw5: USB HID v1.10 Device [RODE Microphones RODECaster Pro] on usb-0000:16:00.0-4/input0

[  156.566513] mc: Linux media interface: v0.10

[  156.583527] usb 1-4: parse_audio_format_rates_v2v3(): unable to retrieve number of sample rates: set it to a predefined value (clock 1).

[  156.609377] usb 1-4: parse_audio_format_rates_v2v3(): unable to retrieve number of sample rates: set it to a predefined value (clock 1).

[  156.632745] usbcore: registered new interface driver snd-usb-audio

laptop

[ 122.098370] usb 2-2: new high-speed USB device number 4 using xhci_hcd

[ 122.246967] usb 2-2: New USB device found, idVendor=19f7, idProduct=0011, bcdDevice= 2.11

[ 122.246973] usb 2-2: New USB device strings: Mfr=1, Product=2, SerialNumber=3

[ 122.246976] usb 2-2: Product: RODECaster Pro

[ 122.246979] usb 2-2: Manufacturer: RODE Microphones

[ 122.246982] usb 2-2: SerialNumber: 00000000001A

[ 122.285806] hid: raw HID events driver (C) Jiri Kosina

[ 122.301802] usb 2-2: parse_audio_format_rates_v2v3(): unable to retrieve number of sample rates: set it to a predefined value (clock 1).

[ 122.303041] usb 2-2: parse_audio_format_rates_v2v3(): unable to retrieve number of sample rates: set it to a predefined value (clock 1).

[ 122.304413] usbcore: registered new interface driver snd-usb-audio

[ 122.307003] usbcore: registered new interface driver usbhid

[ 122.307005] usbhid: USB HID core driver

[ 122.348391] hid-generic 0003:19F7:0011.0001: hiddev0,hidraw0: USB HID v1.10 Device [RODE Microphones RODECaster Pro] on usb-0000:00:14.0-2/input0

So, as far as I understand, on my laptop some interface driver is loaded that does the job, right? But not on my desktop. How can I further check what might be different on both platforms to determine what I can do to make the Rodecaster Pro work on my desktop, too? I have learned something about how sound works on Linux already - and I am willing to learn more :-D

Update: I found

hid: raw HID events driver (C) Jiri Kosina

usbcore: registered new interface driver usbhid

usbhid: USB HID core driver

further up in the dmesg log of the desktop and

mc: Linux media interface: v0.10

further up in the log of the laptop, so there's no real difference, I guess. Dead end.

Additional information that may be useful

sudo udevadm monitor

desktop

KERNEL[1865.590942] add      /devices/pci0000:00/0000:00:02.1/0000:16:00.0/usb1/1-4 (usb)

KERNEL[1865.601419] add      /devices/pci0000:00/0000:00:02.1/0000:16:00.0/usb1/1-4/1-4:1.0 (usb)

KERNEL[1865.612569] add      /devices/pci0000:00/0000:00:02.1/0000:16:00.0/usb1/1-4/1-4:1.0/0003:19F7:0011.0007 (hid)

KERNEL[1865.612799] add      /devices/pci0000:00/0000:00:02.1/0000:16:00.0/usb1/1-4/1-4:1.0/usbmisc/hiddev3 (usbmisc)

KERNEL[1865.612974] add      /devices/pci0000:00/0000:00:02.1/0000:16:00.0/usb1/1-4/1-4:1.0/0003:19F7:0011.0007/hidraw/hidraw6 (hidraw)

KERNEL[1865.613056] bind     /devices/pci0000:00/0000:00:02.1/0000:16:00.0/usb1/1-4/1-4:1.0/0003:19F7:0011.0007 (hid)

KERNEL[1865.613151] bind     /devices/pci0000:00/0000:00:02.1/0000:16:00.0/usb1/1-4/1-4:1.0 (usb)

KERNEL[1865.616426] add      /devices/pci0000:00/0000:00:02.1/0000:16:00.0/usb1/1-4/1-4:1.1 (usb)

KERNEL[1865.677444] add      /devices/pci0000:00/0000:00:02.1/0000:16:00.0/usb1/1-4/1-4:1.1/sound/card5 (sound)

KERNEL[1865.677677] add      /devices/pci0000:00/0000:00:02.1/0000:16:00.0/usb1/1-4/1-4:1.1/sound/card5/pcmC5D0p (sound)

KERNEL[1865.677912] add      /devices/pci0000:00/0000:00:02.1/0000:16:00.0/usb1/1-4/1-4:1.1/sound/card5/pcmC5D0c (sound)

KERNEL[1865.678075] add      /devices/pci0000:00/0000:00:02.1/0000:16:00.0/usb1/1-4/1-4:1.1/sound/card5/controlC5 (sound)

KERNEL[1865.678150] bind     /devices/pci0000:00/0000:00:02.1/0000:16:00.0/usb1/1-4/1-4:1.1 (usb)

KERNEL[1865.678230] add      /devices/pci0000:00/0000:00:02.1/0000:16:00.0/usb1/1-4/1-4:1.2 (usb)

KERNEL[1865.678271] bind     /devices/pci0000:00/0000:00:02.1/0000:16:00.0/usb1/1-4/1-4:1.2 (usb)

KERNEL[1865.678306] add      /devices/pci0000:00/0000:00:02.1/0000:16:00.0/usb1/1-4/1-4:1.3 (usb)

KERNEL[1865.678342] bind     /devices/pci0000:00/0000:00:02.1/0000:16:00.0/usb1/1-4/1-4:1.3 (usb)

KERNEL[1865.678383] bind     /devices/pci0000:00/0000:00:02.1/0000:16:00.0/usb1/1-4 (usb)

UDEV  [1865.689608] add      /devices/pci0000:00/0000:00:02.1/0000:16:00.0/usb1/1-4 (usb)

UDEV  [1865.693927] add      /devices/pci0000:00/0000:00:02.1/0000:16:00.0/usb1/1-4/1-4:1.0 (usb)

UDEV  [1865.695025] add      /devices/pci0000:00/0000:00:02.1/0000:16:00.0/usb1/1-4/1-4:1.3 (usb)

UDEV  [1865.696323] add      /devices/pci0000:00/0000:00:02.1/0000:16:00.0/usb1/1-4/1-4:1.0/0003:19F7:0011.0007 (hid)

UDEV  [1865.696398] add      /devices/pci0000:00/0000:00:02.1/0000:16:00.0/usb1/1-4/1-4:1.1 (usb)

UDEV  [1865.697069] add      /devices/pci0000:00/0000:00:02.1/0000:16:00.0/usb1/1-4/1-4:1.2 (usb)

UDEV  [1865.697653] bind     /devices/pci0000:00/0000:00:02.1/0000:16:00.0/usb1/1-4/1-4:1.3 (usb)

UDEV  [1865.698513] add      /devices/pci0000:00/0000:00:02.1/0000:16:00.0/usb1/1-4/1-4:1.0/usbmisc/hiddev3 (usbmisc)

UDEV  [1865.699314] bind     /devices/pci0000:00/0000:00:02.1/0000:16:00.0/usb1/1-4/1-4:1.2 (usb)

UDEV  [1865.699793] add      /devices/pci0000:00/0000:00:02.1/0000:16:00.0/usb1/1-4/1-4:1.1/sound/card5 (sound)

UDEV  [1865.699910] add      /devices/pci0000:00/0000:00:02.1/0000:16:00.0/usb1/1-4/1-4:1.0/0003:19F7:0011.0007/hidraw/hidraw6 (hidraw)

KERNEL[1865.701496] change   /devices/pci0000:00/0000:00:02.1/0000:16:00.0/usb1/1-4/1-4:1.1/sound/card5 (sound)

UDEV  [1865.701919] bind     /devices/pci0000:00/0000:00:02.1/0000:16:00.0/usb1/1-4/1-4:1.0/0003:19F7:0011.0007 (hid)

UDEV  [1865.702558] add      /devices/pci0000:00/0000:00:02.1/0000:16:00.0/usb1/1-4/1-4:1.1/sound/card5/pcmC5D0p (sound)

UDEV  [1865.703109] add      /devices/pci0000:00/0000:00:02.1/0000:16:00.0/usb1/1-4/1-4:1.1/sound/card5/pcmC5D0c (sound)

UDEV  [1865.703403] bind     /devices/pci0000:00/0000:00:02.1/0000:16:00.0/usb1/1-4/1-4:1.0 (usb)

UDEV  [1865.707163] add      /devices/pci0000:00/0000:00:02.1/0000:16:00.0/usb1/1-4/1-4:1.1/sound/card5/controlC5 (sound)

UDEV  [1865.708834] bind     /devices/pci0000:00/0000:00:02.1/0000:16:00.0/usb1/1-4/1-4:1.1 (usb)

UDEV  [1865.712130] bind     /devices/pci0000:00/0000:00:02.1/0000:16:00.0/usb1/1-4 (usb)

UDEV  [1865.714516] change   /devices/pci0000:00/0000:00:02.1/0000:16:00.0/usb1/1-4/1-4:1.1/sound/card5 (sound)

laptop

KERNEL[73.917616] add      /devices/pci0000:00/0000:00:14.0/usb2/2-1 (usb)

KERNEL[73.918469] add      /devices/pci0000:00/0000:00:14.0/usb2/2-1/2-1:1.0 (usb)

KERNEL[73.918672] add      /devices/pci0000:00/0000:00:14.0/usb2/2-1/2-1:1.1 (usb)

KERNEL[73.918782] add      /devices/pci0000:00/0000:00:14.0/usb2/2-1/2-1:1.2 (usb)

KERNEL[73.918889] add      /devices/pci0000:00/0000:00:14.0/usb2/2-1/2-1:1.3 (usb)

KERNEL[73.919019] bind     /devices/pci0000:00/0000:00:14.0/usb2/2-1 (usb)

UDEV  [73.935752] add      /devices/pci0000:00/0000:00:14.0/usb2/2-1 (usb)

UDEV  [73.953007] add      /devices/pci0000:00/0000:00:14.0/usb2/2-1/2-1:1.2 (usb)

KERNEL[73.956636] add      /module/snd_usbmidi_lib (module)

UDEV  [73.957630] add      /devices/pci0000:00/0000:00:14.0/usb2/2-1/2-1:1.3 (usb)

KERNEL[73.961972] add      /module/hid (module)

KERNEL[73.962835] add      /bus/hid (bus)

KERNEL[73.962873] add      /class/hidraw (class)

UDEV  [73.966103] add      /bus/hid (bus)

KERNEL[73.972181] add      /module/snd_usb_audio (module)

UDEV  [73.973275] add      /module/hid (module)

UDEV  [73.974278] add      /module/snd_usb_audio (module)

KERNEL[73.975143] bind     /devices/pci0000:00/0000:00:14.0/usb2/2-1/2-1:1.2 (usb)

KERNEL[73.975886] bind     /devices/pci0000:00/0000:00:14.0/usb2/2-1/2-1:1.3 (usb)

KERNEL[73.975924] add      /devices/pci0000:00/0000:00:14.0/usb2/2-1/2-1:1.1/sound/card2 (sound)

KERNEL[73.976038] add      /devices/pci0000:00/0000:00:14.0/usb2/2-1/2-1:1.1/sound/card2/pcmC2D0p (sound)

UDEV  [73.977321] add      /module/snd_usbmidi_lib (module)

KERNEL[73.977364] add      /devices/pci0000:00/0000:00:14.0/usb2/2-1/2-1:1.1/sound/card2/pcmC2D0c (sound)

UDEV  [73.977407] add      /devices/pci0000:00/0000:00:14.0/usb2/2-1/2-1:1.1 (usb)

KERNEL[73.977435] add      /devices/pci0000:00/0000:00:14.0/usb2/2-1/2-1:1.1/sound/card2/controlC2 (sound)

KERNEL[73.977470] bind     /devices/pci0000:00/0000:00:14.0/usb2/2-1/2-1:1.1 (usb)

KERNEL[73.977489] add      /bus/usb/drivers/snd-usb-audio (drivers)

KERNEL[73.979239] add      /module/usbhid (module)

UDEV  [73.981525] add      /module/usbhid (module)

UDEV  [73.981982] add      /bus/usb/drivers/snd-usb-audio (drivers)

KERNEL[73.984631] add      /devices/pci0000:00/0000:00:14.0/usb2/2-1/2-1:1.0/0003:19F7:0011.0001 (hid)

KERNEL[73.984795] bind     /devices/pci0000:00/0000:00:14.0/usb2/2-1/2-1:1.0 (usb)

KERNEL[73.984915] add      /bus/usb/drivers/usbhid (drivers)

UDEV  [73.985188] add      /devices/pci0000:00/0000:00:14.0/usb2/2-1/2-1:1.0 (usb)

UDEV  [73.987952] add      /class/hidraw (class)

UDEV  [73.989622] add      /bus/usb/drivers/usbhid (drivers)

UDEV  [73.998682] bind     /devices/pci0000:00/0000:00:14.0/usb2/2-1 (usb)

UDEV  [74.002632] add      /devices/pci0000:00/0000:00:14.0/usb2/2-1/2-1:1.1/sound/card2 (sound)

UDEV  [74.007862] bind     /devices/pci0000:00/0000:00:14.0/usb2/2-1/2-1:1.2 (usb)

UDEV  [74.008550] bind     /devices/pci0000:00/0000:00:14.0/usb2/2-1/2-1:1.3 (usb)

UDEV  [74.011974] add      /devices/pci0000:00/0000:00:14.0/usb2/2-1/2-1:1.1/sound/card2/pcmC2D0p (sound)

UDEV  [74.013611] add      /devices/pci0000:00/0000:00:14.0/usb2/2-1/2-1:1.1/sound/card2/pcmC2D0c (sound)

KERNEL[74.013656] change   /devices/pci0000:00/0000:00:14.0/usb2/2-1/2-1:1.1/sound/card2 (sound)

KERNEL[74.015404] add      /module/hid_generic (module)

KERNEL[74.015782] add      /class/usbmisc (class)

KERNEL[74.016175] add      /devices/pci0000:00/0000:00:14.0/usb2/2-1/2-1:1.0/usbmisc/hiddev0 (usbmisc)

KERNEL[74.016485] add      /devices/pci0000:00/0000:00:14.0/usb2/2-1/2-1:1.0/0003:19F7:0011.0001/hidraw/hidraw0 (hidraw)

KERNEL[74.016799] bind     /devices/pci0000:00/0000:00:14.0/usb2/2-1/2-1:1.0/0003:19F7:0011.0001 (hid)

KERNEL[74.017129] add      /bus/hid/drivers/hid-generic (drivers)

UDEV  [74.017415] add      /module/hid_generic (module)

UDEV  [74.017632] add      /devices/pci0000:00/0000:00:14.0/usb2/2-1/2-1:1.0/0003:19F7:0011.0001 (hid)

UDEV  [74.019223] add      /bus/hid/drivers/hid-generic (drivers)

UDEV  [74.020516] add      /class/usbmisc (class)

UDEV  [74.023101] bind     /devices/pci0000:00/0000:00:14.0/usb2/2-1/2-1:1.0 (usb)

UDEV  [74.028094] add      /devices/pci0000:00/0000:00:14.0/usb2/2-1/2-1:1.0/usbmisc/hiddev0 (usbmisc)

UDEV  [74.030285] add      /devices/pci0000:00/0000:00:14.0/usb2/2-1/2-1:1.1/sound/card2/controlC2 (sound)

UDEV  [74.035919] bind     /devices/pci0000:00/0000:00:14.0/usb2/2-1/2-1:1.1 (usb)

UDEV  [74.038564] add      /devices/pci0000:00/0000:00:14.0/usb2/2-1/2-1:1.0/0003:19F7:0011.0001/hidraw/hidraw0 (hidraw)

UDEV  [74.041016] bind     /devices/pci0000:00/0000:00:14.0/usb2/2-1/2-1:1.0/0003:19F7:0011.0001 (hid)

UDEV  [74.045640] change   /devices/pci0000:00/0000:00:14.0/usb2/2-1/2-1:1.1/sound/card2 (sound)

lsmod

desktop

Module                  Size  Used by

xt_conntrack           16384  2

xt_MASQUERADE          20480  2

nf_conntrack_netlink    49152  0

nfnetlink              20480  2 nf_conntrack_netlink

xfrm_user              36864  1

xfrm_algo              16384  1 xfrm_user

xt_addrtype            16384  2

iptable_filter         16384  1

iptable_nat            16384  1

nf_nat                 49152  2 iptable_nat,xt_MASQUERADE

nf_conntrack          147456  4 xt_conntrack,nf_nat,nf_conntrack_netlink,xt_MASQUERADE

nf_defrag_ipv6         24576  1 nf_conntrack

nf_defrag_ipv4         16384  1 nf_conntrack

libcrc32c              16384  2 nf_conntrack,nf_nat

bpfilter               16384  0

br_netfilter           28672  0

bridge                212992  1 br_netfilter

stp                    16384  1 bridge

llc                    16384  2 bridge,stp

overlay               122880  0

nls_iso8859_1          16384  1

edac_mce_amd           32768  0

snd_hda_codec_ca0132   114688  1

snd_hda_codec_hdmi     61440  2

snd_usb_audio         286720  8

snd_hda_intel          53248  10

kvm                   729088  0

snd_intel_dspcfg       24576  1 snd_hda_intel

snd_hda_codec         143360  3 snd_hda_codec_hdmi,snd_hda_intel,snd_hda_codec_ca0132

snd_hda_core           94208  4 snd_hda_codec_hdmi,snd_hda_intel,snd_hda_codec,snd_hda_codec_ca0132

uvcvideo               98304  0

snd_usbmidi_lib        36864  1 snd_usb_audio

snd_hwdep              20480  2 snd_usb_audio,snd_hda_codec

rapl                   20480  0

videobuf2_vmalloc      20480  1 uvcvideo

snd_seq_midi           20480  0

videobuf2_memops       20480  1 videobuf2_vmalloc

snd_seq_midi_event     16384  1 snd_seq_midi

snd_rawmidi            36864  2 snd_seq_midi,snd_usbmidi_lib

videobuf2_v4l2         28672  1 uvcvideo

snd_seq                73728  2 snd_seq_midi,snd_seq_midi_event

videobuf2_common       57344  2 videobuf2_v4l2,uvcvideo

input_leds             16384  0

snd_pcm               118784  6 snd_hda_codec_hdmi,snd_hda_intel,snd_usb_audio,snd_hda_codec,snd_hda_core,snd_hda_codec_ca0132

snd_seq_device         16384  3 snd_seq,snd_seq_midi,snd_rawmidi

videodev              245760  3 videobuf2_v4l2,uvcvideo,videobuf2_common

mousedev               20480  0

joydev                 28672  0

snd_timer              40960  2 snd_seq,snd_pcm

mc                     57344  5 videodev,snd_usb_audio,videobuf2_v4l2,uvcvideo,videobuf2_common

xpad                   40960  0

snd                    94208  48 snd_seq,snd_seq_device,snd_hda_codec_hdmi,snd_hwdep,snd_hda_intel,snd_usb_audio,snd_usbmidi_lib,snd_hda_codec,snd_timer,snd_pcm,snd_hda_codec_ca0132,snd_rawmidi

ff_memless             20480  1 xpad

wmi_bmof               16384  0

blackmagic_io        1904640  1

k10temp                20480  0

efi_pstore             16384  0

ccp                   102400  0

soundcore              16384  1 snd

mac_hid                16384  0

nvidia_uvm           1011712  0

sch_fq_codel           20480  2

parport_pc             45056  0

ppdev                  24576  0

lp                     20480  0

parport                65536  3 parport_pc,lp,ppdev

ip_tables              32768  2 iptable_filter,iptable_nat

x_tables               45056  5 xt_conntrack,iptable_filter,xt_addrtype,ip_tables,xt_MASQUERADE

autofs4                45056  2

dm_crypt               53248  1

hid_generic            16384  0

usbhid                 57344  0

hid                   135168  2 usbhid,hid_generic

nvidia_drm             53248  8

nvidia_modeset       1183744  14 nvidia_drm

amdgpu               5853184  3

crct10dif_pclmul       16384  1

iommu_v2               20480  1 amdgpu

crc32_pclmul           16384  0

gpu_sched              36864  1 amdgpu

nvidia              19771392  634 nvidia_uvm,nvidia_modeset

ghash_clmulni_intel    16384  0

i2c_algo_bit           16384  1 amdgpu

ttm                   106496  1 amdgpu

aesni_intel           372736  2

drm_kms_helper        225280  2 amdgpu,nvidia_drm

syscopyarea            16384  1 drm_kms_helper

sysfillrect            16384  1 drm_kms_helper

crypto_simd            16384  1 aesni_intel

sysimgblt              16384  1 drm_kms_helper

cryptd                 24576  3 crypto_simd,ghash_clmulni_intel

fb_sys_fops            16384  1 drm_kms_helper

glue_helper            16384  1 aesni_intel

cec                    53248  1 drm_kms_helper

rc_core                53248  1 cec

r8169                  94208  0

drm                   557056  17 gpu_sched,drm_kms_helper,amdgpu,nvidia_drm,ttm

realtek                24576  1

i2c_piix4              28672  0

ahci                   40960  3

xhci_pci               20480  0

libahci                36864  1 ahci

xhci_pci_renesas       20480  1 xhci_pci

wmi                    32768  1 wmi_bmof

video                  49152  0

backlight              24576  3 video,amdgpu,drm

gpio_amdpt             20480  0

gpio_generic           20480  1 gpio_amdpt

laptop

Module                  Size  Used by

hid_generic            16384  0

usbhid                 57344  0

snd_usb_audio         282624  2

hid                   131072  2 usbhid,hid_generic

snd_usbmidi_lib        36864  1 snd_usb_audio

rfcomm                 81920  4

ccm                    20480  6

cmac                   16384  3

algif_hash             16384  1

algif_skcipher         16384  1

af_alg                 28672  6 algif_hash,algif_skcipher

bnep                   24576  2

nls_iso8859_1          16384  1

intel_rapl_msr         20480  0

uvcvideo               98304  0

videobuf2_vmalloc      20480  1 uvcvideo

videobuf2_memops       20480  1 videobuf2_vmalloc

videobuf2_v4l2         28672  1 uvcvideo

videobuf2_common       53248  2 videobuf2_v4l2,uvcvideo

videodev              245760  3 videobuf2_v4l2,uvcvideo,videobuf2_common

mc                     57344  5 videodev,snd_usb_audio,videobuf2_v4l2,uvcvideo,videobuf2_common

intel_rapl_common      28672  1 intel_rapl_msr

snd_hda_codec_realtek   131072  1

snd_hda_codec_generic    81920  1 snd_hda_codec_realtek

ledtrig_audio          16384  2 snd_hda_codec_generic,snd_hda_codec_realtek

x86_pkg_temp_thermal    20480  0

iwldvm                241664  0

intel_powerclamp       20480  0

snd_hda_codec_hdmi     61440  1

mac80211              917504  1 iwldvm

snd_hda_intel          53248  4

coretemp               20480  0

snd_intel_dspcfg       24576  1 snd_hda_intel

snd_hda_codec         143360  4 snd_hda_codec_generic,snd_hda_codec_hdmi,snd_hda_intel,snd_hda_codec_realtek

snd_hda_core           94208  5 snd_hda_codec_generic,snd_hda_codec_hdmi,snd_hda_intel,snd_hda_codec,snd_hda_codec_realtek

snd_hwdep              20480  2 snd_usb_audio,snd_hda_codec

libarc4                16384  1 mac80211

snd_seq_midi           20480  0

snd_seq_midi_event     16384  1 snd_seq_midi

iwlwifi               364544  1 iwldvm

snd_pcm               118784  5 snd_hda_codec_hdmi,snd_hda_intel,snd_usb_audio,snd_hda_codec,snd_hda_core

kvm_intel             282624  0

btusb                  57344  0

snd_rawmidi            36864  2 snd_seq_midi,snd_usbmidi_lib

btrtl                  24576  1 btusb

snd_seq                73728  2 snd_seq_midi,snd_seq_midi_event

btbcm                  16384  1 btusb

btintel                28672  1 btusb

joydev                 28672  0

snd_seq_device         16384  3 snd_seq,snd_seq_midi,snd_rawmidi

kvm                   729088  1 kvm_intel

snd_timer              40960  2 snd_seq,snd_pcm

bluetooth             626688  31 btrtl,btintel,btbcm,bnep,btusb,rfcomm

at24                   24576  0

mei_me                 40960  0

rapl                   20480  0

cfg80211              782336  3 iwldvm,iwlwifi,mac80211

intel_cstate           20480  0

input_leds             16384  0

serio_raw              20480  0

ecdh_generic           16384  2 bluetooth

mei                   110592  1 mei_me

snd                    94208  25 snd_hda_codec_generic,snd_seq,snd_seq_device,snd_hda_codec_hdmi,snd_hwdep,snd_hda_intel,snd_usb_audio,snd_usbmidi_lib,snd_hda_codec,snd_hda_codec_realtek,snd_timer,snd_pcm,snd_rawmidi

ecc                    32768  1 ecdh_generic

soundcore              16384  1 snd

tpm_infineon           20480  0

mac_hid                16384  0

sch_fq_codel           20480  6

parport_pc             45056  0

ppdev                  24576  0

lp                     20480  0

parport                65536  3 parport_pc,lp,ppdev

ip_tables              32768  0

x_tables               45056  1 ip_tables

autofs4                45056  2

dm_crypt               49152  1

rtsx_pci_sdmmc         28672  0

i915                 2273280  17

crct10dif_pclmul       16384  1

crc32_pclmul           16384  0

ghash_clmulni_intel    16384  0

aesni_intel           372736  10

crypto_simd            16384  1 aesni_intel

cryptd                 24576  4 crypto_simd,ghash_clmulni_intel

glue_helper            16384  1 aesni_intel

i2c_algo_bit           16384  1 i915

drm_kms_helper        225280  1 i915

syscopyarea            16384  1 drm_kms_helper

sysfillrect            16384  1 drm_kms_helper

psmouse               159744  0

sysimgblt              16384  1 drm_kms_helper

fb_sys_fops            16384  1 drm_kms_helper

cec                    53248  2 drm_kms_helper,i915

ahci                   40960  3

i2c_i801               32768  0

rc_core                53248  1 cec

libahci                36864  1 ahci

i2c_smbus              20480  1 i2c_i801

r8169                  94208  0

xhci_pci               20480  0

rtsx_pci               90112  1 rtsx_pci_sdmmc

drm                   561152  10 drm_kms_helper,i915

lpc_ich                24576  0

xhci_pci_renesas       20480  1 xhci_pci

realtek                24576  1

wmi                    32768  0

video                  49152  1 i915

aplay --dump-hw-params -D hw:x -t raw /dev/zero

Running

pulseaudio -k

aplay --dump-hw-params -D hw:x -t raw /dev/zero

where x is the respective card number yields the same for the desktop and the laptop:

Playing raw data '/dev/zero' : Unsigned 8 bit, Rate 8000 Hz, Mono

HW Params of device "hw:x":

--------------------

ACCESS:  MMAP_INTERLEAVED RW_INTERLEAVED

FORMAT:  S32_LE

SUBFORMAT:  STD

SAMPLE_BITS: 32

FRAME_BITS: 64

CHANNELS: 2

RATE: 48000

PERIOD_TIME: (166 1365334)

PERIOD_SIZE: [8 65536]

PERIOD_BYTES: [64 524288]

PERIODS: [2 1024]

BUFFER_TIME: (333 2730667)

BUFFER_SIZE: [16 131072]

BUFFER_BYTES: [128 1048576]

TICK_TIME: ALL

--------------------

aplay: set_params:1343: Sample format non available

Available formats:

- S32_LE

More details

• I have already tried to use different USB ports, 2.0 and 3.0, etc. Didn't make a difference.

  
  



• I have disabled other audio devices via pavucontrol - to no avail.

  
  



• I have disabled the motherboard's audio card and I have removed all other audio output interfaces physically - removed a Soundblaster and my graphics card that could output audio via HDMI. Didn't make a difference.

  
  



• I have booted a plain Ubuntu 21.04 from a pen drive (with not other audio hardware inside) - didn't work.

  
  



• I killed pulse audio (pulseaudio -k) and ran a wav sample using aplay. Sound is still distorted.

  
  



• The Rodecaster Pro registers as a USB HID device, but does not support the UAC2_CS_RANGE usb function call. That's why special handling was introduced to the Linux kernal (https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/sound/usb/format.c?h=v5.8#n412), but that's fine - well, listed in pulse audio at least.

  
  



• My Rodecaster Pro runs firmware 2.1.1, but that's should not be relevant, since it's working on my laptop.