Bug 253160

Summary:

[sound] [usb] noise with uaudio in bitperfect mode

Product:

Base System

Reporter:

Oleh Vinichenko <moonlapse81>

Component:

usb

Assignee:

freebsd-usb (Nobody) <usb>

Status:

Closed Works As Intended

Severity:

Affects Only Me

CC:

hselasky

Priority:

---

Version:

12.2-STABLE

Hardware:

amd64

OS:

Any

Attachments:

Description	Flags
dump of usb	none
output of lsusb -vvv	none
dmesg	none
dmesg after reconnecting	none
dmesg_with_musicpd_bitperfect_enabled	none

Description Oleh Vinichenko 2021-02-01 13:10:16 UTC

I have usb audio device Schiit Fulla 2.
When bitperfect mode activated for this device, playback produces only white noise.
It plays perfectly good with bitperfect disabled

Comment 1 Oleh Vinichenko 2021-02-01 13:11:23 UTC

Created attachment 222070 [details]
dump of usb

Comment 2 Oleh Vinichenko 2021-02-01 13:11:55 UTC

Created attachment 222071 [details]
output of lsusb -vvv

Comment 3 Oleh Vinichenko 2021-02-01 13:12:26 UTC

Created attachment 222072 [details]
dmesg

Comment 4 Hans Petter Selasky freebsd_committer

2021-02-01 13:13:19 UTC

Can you share what application you are using?

Typically bitperfect mode only works with selected applications.

Also dmesg output is appreciated!

--HPS

Comment 5 Hans Petter Selasky freebsd_committer

2021-02-01 13:17:00 UTC

You need the dmesg of the attach sequence. What is printed at detach?

Comment 6 Hans Petter Selasky freebsd_committer

2021-02-01 13:29:35 UTC

You might find virtual_oss in ports useful to solve your problem.

--HPS

Comment 7 Oleh Vinichenko 2021-02-01 13:34:59 UTC

i didn't know it is working only for selected programs, i have tried playing some album through bandcamp. i will try setting up audio/musicpd and report back.
how do i get dmesg of attach sequeence?

Comment 8 Hans Petter Selasky freebsd_committer

2021-02-01 13:36:24 UTC

After connecting the device:
dmesg | grep -i uaudio

--HPS

Comment 9 Oleh Vinichenko 2021-02-01 13:42:30 UTC

Created attachment 222076 [details]
dmesg after reconnecting

Comment 10 Oleh Vinichenko 2021-02-01 14:41:09 UTC

Created attachment 222079 [details]
dmesg_with_musicpd_bitperfect_enabled

Comment 11 Oleh Vinichenko 2021-03-05 14:36:31 UTC

i am not sure if virtual_oss could be useful, though i did not try. my intention was to disable any vchans and use the sound directly by hardware, which is what i supposed bit perfect would give. I did not know, this is limited to a number of devices. So this can be closed as expected :)