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
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
Code:
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
dmesg -w
I ran dmesg -w on both my machines when plugging in the Rodecaster, but everything that was loaded on the one machine was loaded on the other as well.
sudo udevadm monitor
desktop
Code:
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
Code:
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
Code:
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
Code:
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
Code:
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:
Code:
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
I have already found out that aplay -f S32_LE -c 2 -r 48000 -D hw:x ~/sample.wav needs to be used to run a sample ... Still distorted sound.
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....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.
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