You can disable pulseaudio by following below link.. https://askubuntu.com/questions/8425/how-to-temporarily-disable-pulseaudio But need to find why its not working.. On Fri, Aug 13, 2021, 21:59 Muni Sekhar <munisekharrms@xxxxxxxxx> wrote: > On Wed, Aug 11, 2021 at 6:48 PM Muni Sekhar <munisekharrms@xxxxxxxxx> > wrote: > > > > On Wed, Aug 11, 2021 at 6:19 PM vishnu <vardhanraj4143@xxxxxxxxx> wrote: > > > > > > can you paste output of > > > arecord -l (list of capture devices). > > $ arecord -l > > **** List of CAPTURE Hardware Devices **** > > card 0: USB [Plantronics .Audio 628 USB], device 0: USB Audio [USB Audio] > > Subdevices: 1/1 > > Subdevice #0: subdevice #0 > > > > > > > Which device you are using and os. > > > Does this instance is already open by default? like any video playing > or something like that? > > lsof does not catch it. > > > > > > > > Yes you can stop pulse audio and try.. > > > > > > On Wed, Aug 11, 2021 at 6:17 PM Jaroslav Kysela <perex@xxxxxxxx> > wrote: > > >> > > >> On 11. 08. 21 14:36, Muni Sekhar wrote: > > >> > Hi All, > > >> > > > >> > $ cat /proc/asound/cards > > >> > 0 [USB ]: USB-Audio - Plantronics .Audio 628 USB > > >> > Plantronics Plantronics .Audio 628 USB at > > >> > usb-0000:00:14.0-2, full speed > > >> > > > >> > I am using a Plantronics USB Audio headset. > > >> > > > >> > $ arecord --device hw:0,0 --channels 2 --format S16_LE --rate > 44100Hz x.wav > > >> > arecord: main:722: audio open error: Device or resource busy > > >> > > > >> > > > >> > 'arecord' command always fails the first time after system boot in > my > > >> > system. But subsequent execution of the 'arecord' command runs fine. > > >> > > > >> > > > >> > I've attached the strace log for the "audio open error: Device or > > >> > resource busy" failure. Is there any fix available for this issue? > > >> > > >> You may check which other task blocks the PCM device: > > >> > > >> lsof /dev/snd/pcmC0D0c > > It does not output any process. > > $ lsof /dev/snd/pcmC0D0c > > > > 1st run: > > ---------- > > $ arecord --device hw:0,0 --channels 2 --format S16_LE --rate 44100Hz > x.wav > > arecord: main:722: audio open error: Device or resource busy > > > > 2nd run: > > ---------- > > $ arecord --device hw:0,0 --channels 2 --format S16_LE --rate 44100Hz > x.wav > > Recording WAVE 'x.wav' : Signed 16 bit Little Endian, Rate 44100 Hz, > Stereo > > ^CAborted by signal Interrupt... > > > > > > >> > > >> I guess that it will be pulseaudio (device enumeration). > I see that pulseaudio is getting loaded on invoking the 1st run of > 'arecord' command. Here is the log: > > After system boot I verified that pulseaudio is not in the memory. > > test@test594:~$ uptime > 21:39:27 up 0 min, 1 user, load average: 0.70, 0.25, 0.09 > test@test594:~$ ls -ltr /dev/snd/controlC1 > crw-rw---- 1 root audio 116, 2 Aug 13 21:38 /dev/snd/controlC1 > test@test594:~$ ls -ltr /dev/snd/ > total 0 > crw-rw---- 1 root audio 116, 33 Aug 13 21:38 timer > crw-rw---- 1 root audio 116, 1 Aug 13 21:38 seq > crw-rw---- 1 root audio 116, 3 Aug 13 21:38 pcmC1D0p > crw-rw---- 1 root audio 116, 4 Aug 13 21:38 pcmC1D0c > crw-rw---- 1 root audio 116, 2 Aug 13 21:38 controlC1 > drwxr-xr-x 2 root root 60 Aug 13 21:38 by-path > drwxr-xr-x 2 root root 60 Aug 13 21:38 by-id > test@test594:~$ lsof /dev/snd/controlC1 > test@test594:~$ lsof /dev/snd/pcmC1D0c > test@test594:~$ > > > 1st run of 'arecord': > ------------------------- > I triggered 'arecord' after 2 mins of the system boot. In the 1st run, > it failed with "Device or resource busy" and I see that pulseaudio > loaded in the memory. > Why does pulseaudio get triggered on running the alsa-utils command? > How is the failure message "Device or resource busy" from the kernel code? > > > test@test594:~$ arecord --device hw:1,0 --channels 2 --format S16_LE > --rate 44100Hz x.wav > arecord: main:722: audio open error: Device or resource busy > test@test594:~$ > test@test594:~$ lsof /dev/snd/pcmC1D0c > COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME > pulseaudi 1550 test mem CHR 116,4 463 /dev/snd/pcmC1D0c > pulseaudi 1550 test 27u CHR 116,4 0t0 463 /dev/snd/pcmC1D0c > test@test594:~$ lsof /dev/snd/controlC1 > COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME > pulseaudi 1550 test 20u CHR 116,2 0t0 461 /dev/snd/controlC1 > pulseaudi 1550 test 26u CHR 116,2 0t0 461 /dev/snd/controlC1 > test@test594:~$ lsof /dev/snd/pcmC1D0p > test@test594:~$ > test@test594:~$ uptime > 21:41:06 up 2 min, 1 user, load average: 0.20, 0.19, 0.08 > > > 2nd run of 'arecord': > ------------------------- > The subsequent run of arecord runs fine without any issues even though > pulseaudio is still in memory. > > test@test594:~$ arecord --device hw:1,0 --channels 2 --format S16_LE > --rate 44100Hz x.wav > Recording WAVE 'x.wav' : Signed 16 bit Little Endian, Rate 44100 Hz, Stereo > ^CAborted by signal Interrupt... > test@test594:~$ uptime > 21:41:22 up 2 min, 1 user, load average: 0.14, 0.18, 0.08 > test@test594:~$ > > What is the role of pulseaudio? Is there a way to disable it from running > it? > Disabling pulseaudio causes any issues while testing audio drivers? > > > > >> > > >> Jaroslav > > >> > > >> -- > > >> Jaroslav Kysela <perex@xxxxxxxx> > > >> Linux Sound Maintainer; ALSA Project; Red Hat, Inc. > > > > > > > > -- > > Thanks, > > Sekhar > > > > -- > Thanks, > Sekhar >
