Results 1 to 2 of 2

Thread: Audio mixer Rodecaster Pro work on Ubuntu 20.04 playing distorted sound

  1. #1
    Join Date
    May 2021
    Beans
    2

    Audio mixer Rodecaster Pro work on Ubuntu 20.04 playing distorted sound

    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.

  2. #2
    Join Date
    May 2021
    Beans
    2

    Re: Audio mixer Rodecaster Pro work on Ubuntu 20.04 playing distorted sound

    I have meanwhile filed a bug report at https://bugs.launchpad.net/ubuntu/+s...r/+bug/1927255.

Tags for this Thread

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •