On Fri, 11 Jun 2021 10:43:01 +0200, Muni Sekhar wrote: > > On Fri, Jun 11, 2021 at 1:19 PM Takashi Iwai <tiwai@xxxxxxx> wrote: > > > > On Fri, 11 Jun 2021 09:02:44 +0200, > > Muni Sekhar wrote: > > > > > > Hi all, > > > > > > I am using a USB sound card(snd-usb-audio), and it fails while doing > > > the audio recording "arecord: pcm_read:2032: read error: Input/output > > > error". > > > > > > I noticed recording(arecord) audio data on a USB sound card fails at > > > SNDRV_PCM_IOCTL_READI_FRAMES is giving EIO. > > > > > > Can someone please clarify when the kernel returns EIO for Ioctl > > > SNDRV_PCM_IOCTL_READI_FRAMES? and is there a workaround for this? > > > > It's a problem of either your device (e.g. USB device firmware) or the > > kernel. Do you get any relevant kernel error messages? > dmesg log does not indicate any such error messages when arecord fails. Then it's likely a debug print in PCM core, which is suppressed as default. You can enable it via dyndbg stuff. It won't help much for diagnose at this stage, though. > Is there a way to prove it as a USB device firmware issue or kernel issue? You can check strace output, for example. The PCM core is supposed to be bug-free regarding this, so it's about USB-audio driver, and the problem is specific to your device (other USB-audio devices work), hence it's very likely a firmware problem. > Please find the alsamixer output in the attached file alsamixer_output.png file. The mixer output has nothing to do with the PCM problem. Takashi
