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a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=83QMaYgOJJuYsR2kxYZiVuev/+nUJCI6rEb/EnIuDuY=; b=E2fwOxEzagAybCILVe9messy1wMG6zlGQBg4SLjXN+F6Die0m1EClZHVi9Xb/6eDbB bqUvVaUEUYN3KXDv+bTXq6OGB34bma1Ld9y6/Xd8i4jcTSqppdwOv8nT1cu5AiWoDNcN 7L65mkjXYF/9W2biErpKa7VAjIM3GWfciNmeu9Yj/9O0TqUttCOgRCzDAepz/j+h1lKV PC3ehPVbJTbuRn8kpzcYc6cjjPhJQZIwaLqHHTRj/aUfA8TKuR3tzO3wde79pRJ8PVO2 KA/N4tUReMIsoV41PdtQcNJY4E9V8yiWx+NARpiEuQCqtetLwDNEuI92902UPj/CULz/ 2aOg== X-Gm-Message-State: AOAM530kXhpYcWE/90VhPn3f4NBguJ/x09QqxghVJujEvSjYIAid5Xft 1ixPkEVgit3nCsoEiNSNpJRg5MBxFsjJEKrmluU= X-Google-Smtp-Source: ABdhPJzVrUR44aZ5Gl98WYuXTGRBEuaY5gOnseyJaYAFHEgkgt09tShqlq6uLkxrWm/s1RcBJ0Euqu3PM06mRNEHUmE= X-Received: by 2002:aa7:8757:0:b0:3e0:ff06:aea4 with SMTP id g23-20020aa78757000000b003e0ff06aea4mr3122318pfo.38.1628874409176; Fri, 13 Aug 2021 10:06:49 -0700 (PDT) MIME-Version: 1.0 References: <41bebccc-7940-8379-0108-047bd1cc92f9@perex.cz> In-Reply-To: From: vishnu Date: Fri, 13 Aug 2021 22:36:38 +0530 Message-ID: Subject: Re: USB-Audio: Device or resource busy (strace log) To: Muni Sekhar Content-Type: text/plain; charset="UTF-8" X-Content-Filtered-By: Mailman/MimeDel 2.1.15 Cc: alsa-devel , kernelnewbies , linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org, linux-sound@vger.kernel.org X-BeenThere: alsa-devel@alsa-project.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: "Alsa-devel mailing list for ALSA developers - http://www.alsa-project.org" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: alsa-devel-bounces@alsa-project.org Sender: "Alsa-devel" 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 wrote: > On Wed, Aug 11, 2021 at 6:48 PM Muni Sekhar > wrote: > > > > On Wed, Aug 11, 2021 at 6:19 PM vishnu 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 > 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 > > >> Linux Sound Maintainer; ALSA Project; Red Hat, Inc. > > > > > > > > -- > > Thanks, > > Sekhar > > > > -- > Thanks, > Sekhar > From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: ** X-Spam-Status: No, score=2.5 required=3.0 tests=BAYES_00,DKIM_ADSP_CUSTOM_MED, DKIM_INVALID,DKIM_SIGNED,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,HTML_MESSAGE,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,URIBL_BLOCKED autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 6EAC7C4338F for ; Fri, 13 Aug 2021 17:07:09 +0000 (UTC) Received: from shelob.surriel.com (shelob.surriel.com [96.67.55.147]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 9EC1860FC3 for ; Fri, 13 Aug 2021 17:07:08 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org 9EC1860FC3 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=gmail.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=kernelnewbies.org Received: from localhost ([::1] helo=shelob.surriel.com) by shelob.surriel.com with esmtp (Exim 4.94.2) (envelope-from ) id 1mEadx-0001LJ-As; Fri, 13 Aug 2021 13:06:53 -0400 Received: from mail-pl1-x631.google.com ([2607:f8b0:4864:20::631]) by shelob.surriel.com with esmtps (TLS1.2) tls TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256 (Exim 4.94.2) (envelope-from ) id 1mEadu-0001Kf-RZ for kernelnewbies@kernelnewbies.org; Fri, 13 Aug 2021 13:06:50 -0400 Received: by mail-pl1-x631.google.com with SMTP id e15so12802012plh.8 for ; Fri, 13 Aug 2021 10:06:50 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=83QMaYgOJJuYsR2kxYZiVuev/+nUJCI6rEb/EnIuDuY=; b=K6S9uSIQBUUpZB9iABEX+ve85F1dwCHr3uAQbi8ML1kens9wmCetu9NNuGyJBTWJ+q eORIZ01bhl1djBgXHw/+hP6CS+hlHnVZf/3Unt6foZz/mpzZTa/G/5yLXkQBP86p2ryE EHxLk6+PReH3k1neFctFbQZDA04Dvx3fTX3vsM0kma6V1iwtbAO5NLiOQoIWi6H6gwp1 3H03u+zuQ6MaUKhfOhbroQMrBwX1MT84tpLO7wFEpZ39qf403f5048/NtJKbE+ZRozGr fPhhXtcASvfhJE2L51NUeMRwCQO1y5kZrhRq0N79lsCAICOJ7Q4RWn2yOneEZJpbDzZZ UJVw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=83QMaYgOJJuYsR2kxYZiVuev/+nUJCI6rEb/EnIuDuY=; b=AyuABLK+MSy8muAXdnBuD+g6V0AsVZDfOi1ulaKOUzLJgEE6eYeDeOIm1N9Lml7YWF MQoflTInbGu/DsFkFvuKDi1FZEB4WqGC2/jvYHoQpKLFG/Ql0jsITmbFTDlip17oTFA9 aqxTQCG8Tfy58S9BNvBE8sRMSJx+TOcE2f5UmUIVDmaDCkUH1spz0iqX3MyDKyQKwsoF 90wyZdi9ybyBa+ACjg1tRw84C8AskgDocbREXBD1z4OJqVX11mvs+1Wmuh1Fy/yM3PkN W3/vtT9c6d8eXDGb025TIR2lNDrkuFHRcStIr/5YFecAT9DAPNy+mrmGOu+MK78yHcX+ URLQ== X-Gm-Message-State: AOAM530csECuJgHiZ+64kYDkVvk1RLi8XoU0bYZpY3S8TcaMhHcvDq8b VboC4jtMT495jmKrVdEIvfI1Zm0HXLj08iMPwI4= X-Google-Smtp-Source: ABdhPJzVrUR44aZ5Gl98WYuXTGRBEuaY5gOnseyJaYAFHEgkgt09tShqlq6uLkxrWm/s1RcBJ0Euqu3PM06mRNEHUmE= X-Received: by 2002:aa7:8757:0:b0:3e0:ff06:aea4 with SMTP id g23-20020aa78757000000b003e0ff06aea4mr3122318pfo.38.1628874409176; Fri, 13 Aug 2021 10:06:49 -0700 (PDT) MIME-Version: 1.0 References: <41bebccc-7940-8379-0108-047bd1cc92f9@perex.cz> In-Reply-To: From: vishnu Date: Fri, 13 Aug 2021 22:36:38 +0530 Message-ID: Subject: Re: USB-Audio: Device or resource busy (strace log) To: Muni Sekhar Cc: alsa-devel , kernelnewbies , linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org, linux-sound@vger.kernel.org, Jaroslav Kysela X-BeenThere: kernelnewbies@kernelnewbies.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Learn about the Linux kernel List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: multipart/mixed; boundary="===============3632333067067622394==" Errors-To: kernelnewbies-bounces@kernelnewbies.org --===============3632333067067622394== Content-Type: multipart/alternative; boundary="0000000000008b148305c973e03d" --0000000000008b148305c973e03d Content-Type: text/plain; charset="UTF-8" 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 wrote: > On Wed, Aug 11, 2021 at 6:48 PM Muni Sekhar > wrote: > > > > On Wed, Aug 11, 2021 at 6:19 PM vishnu 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 > 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 > > >> Linux Sound Maintainer; ALSA Project; Red Hat, Inc. > > > > > > > > -- > > Thanks, > > Sekhar > > > > -- > Thanks, > Sekhar > --0000000000008b148305c973e03d Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
You can disable pulseaudio by following below link..



But need = to find why its=C2=A0not working..

On Fri, Aug 13, 2021, 21:59 Muni Se= khar <munisekharrms@gmail.com= > wrote:
On Wed, Aug 11, 202= 1 at 6:48 PM Muni Sekhar <munisekharrms@gmail.com> wrote: >
> On Wed, Aug 11, 2021 at 6:19 PM vishnu <vardhanraj4143@gmail.= com> 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 Aud= io]
>=C2=A0 =C2=A0Subdevices: 1/1
>=C2=A0 =C2=A0Subdevice #0: subdevice #0
>
>
> > Which device you are using and os.
> > Does this instance is already open by default? like any video pla= ying 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@perex.cz> wrote:
> >>
> >> On 11. 08. 21 14:36, Muni Sekhar wrote:
> >> > Hi All,
> >> >
> >> > $ cat /proc/asound/cards
> >> >=C2=A0 0 [USB=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 ]:= USB-Audio - Plantronics .Audio 628 USB
> >> >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0 =C2=A0 =C2=A0 =C2=A0Plantronics 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 af= ter system boot in my
> >> > system. But subsequent execution of the 'arecord'= ; command runs fine.
> >> >
> >> >
> >> > I've attached the strace log for the "audio ope= n error: Device or
> >> > resource busy" failure. Is there any fix available = for this issue?
> >>
> >> You may check which other task blocks the PCM device:
> >>
> >>=C2=A0 =C2=A0lsof /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 441= 00 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
=C2=A021:39:27 up 0 min,=C2=A0 1 user,=C2=A0 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,=C2=A0 1 Aug 13 21:38 seq
crw-rw---- 1 root audio 116,=C2=A0 3 Aug 13 21:38 pcmC1D0p
crw-rw---- 1 root audio 116,=C2=A0 4 Aug 13 21:38 pcmC1D0c
crw-rw---- 1 root audio 116,=C2=A0 2 Aug 13 21:38 controlC1
drwxr-xr-x 2 root root=C2=A0 =C2=A0 =C2=A0 =C2=A060 Aug 13 21:38 by-path drwxr-xr-x 2 root root=C2=A0 =C2=A0 =C2=A0 =C2=A060 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 r= un,
it failed with "Device or resource busy" and I see that pulseaudi= o
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 ker= nel 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=C2=A0 =C2=A0 PID=C2=A0 =C2=A0USER=C2=A0 =C2=A0FD=C2=A0 =C2=A0TYPE D= EVICE SIZE/OFF NODE NAME
pulseaudi 1550 test=C2=A0 mem=C2=A0 =C2=A0 CHR=C2=A0 116,4=C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 =C2=A0463 /dev/snd/pcmC1D0c
pulseaudi 1550 test=C2=A0 =C2=A027u=C2=A0 =C2=A0CHR=C2=A0 116,4=C2=A0 =C2= =A0 =C2=A0 0t0=C2=A0 463 /dev/snd/pcmC1D0c
test@test594:~$ lsof /dev/snd/controlC1
COMMAND=C2=A0 =C2=A0 PID=C2=A0 =C2=A0USER=C2=A0 =C2=A0FD=C2=A0 =C2=A0TYPE D= EVICE SIZE/OFF NODE NAME
pulseaudi 1550 test=C2=A0 =C2=A020u=C2=A0 =C2=A0CHR=C2=A0 116,2=C2=A0 =C2= =A0 =C2=A0 0t0=C2=A0 461 /dev/snd/controlC1
pulseaudi 1550 test=C2=A0 =C2=A026u=C2=A0 =C2=A0CHR=C2=A0 116,2=C2=A0 =C2= =A0 =C2=A0 0t0=C2=A0 461 /dev/snd/controlC1
test@test594:~$ lsof /dev/snd/pcmC1D0p
test@test594:~$
test@test594:~$ uptime
=C2=A021:41:06 up 2 min,=C2=A0 1 user,=C2=A0 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
=C2=A021:41:22 up 2 min,=C2=A0 1 user,=C2=A0 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 i= t?
Disabling pulseaudio causes any issues while testing audio drivers?


> >>
> >>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0= =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0Jaroslav
> >>
> >> --
> >> Jaroslav Kysela <perex@perex.cz>
> >> Linux Sound Maintainer; ALSA Project; Red Hat, Inc.
>
>
>
> --
> Thanks,
> Sekhar



--
Thanks,
Sekhar
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