On Tue, Jul 04, 2023 at 08:06:04PM +0200, Aurélien wrote:

Hello,

Hi Aurélien!

I encounter troubles while using S/PDIF input on an CM106 like sound card (vendor 0x0d8c, device 0x0102) when the remote device which is connected by S/ PDIF to the sound card is powered off. In that case garbage data are reading from the S/PDIF rather than.. nothing

It is really boring since this S/PDIF input is connected to the output speakers and once the remote deviced is powered off it emits a really disturbing sound. Since there is no input on the S/PDIF I guess that it could be a driver bug? If it's an hardware bug (I don't encounter the problem under windows..) is it possible to make a hack in order to distinguish between real data and noise on the S/PDIF input?

Unfortunately this test is performed on an embedded device which runs linux 5.16.17-sun50iw6. I don't know if this problem still occurs with newer alsa version.

This looks like a vendor (downstream) kernel. ALSA Project does not accept bug reports for vendor kernels. You must try to reproduce your issue with the latest mainline kernel.

Thanks, Geraldo Nascimento

Thank you in advance for your help. Regards,

Aurélien