On Thu, May 20, 2021 at 2:35 AM Arve Barsnes <arve.bars...@gmail.com> wrote: > > Hello, > > Resending this message, as the last time it was derailed by a question > about DE and pulseaudio, neither of which are relevant to this > low-level problem (and also not installed anyway, as I run a simple > openbox WM with alsa only). > > Does anyone know anything about how to check audio through Nvidia HDMI outputs? > > My regular audio is through the motherboard output, and I also have a > USB soundcard that I regularly use without trouble, but my HDMI is a > different matter. > > I have a GTX 1080 card with two HDMI outputs, the first connected to > my main monitor, and the second connected to a TV. I've managed to > play sound through my monitor with aplay, but no luck with the TV. > > aplay reports: > $ aplay -l > card 1: NVidia [HDA NVidia], device 3: HDMI 0 [HDMI 0] > Subdevices: 1/1 > Subdevice #0: subdevice #0 > card 1: NVidia [HDA NVidia], device 7: HDMI 1 [HDMI 1] > Subdevices: 1/1 > Subdevice #0: subdevice #0 > card 1: NVidia [HDA NVidia], device 8: HDMI 2 [HDMI 2] > Subdevices: 1/1 > Subdevice #0: subdevice #0 > card 1: NVidia [HDA NVidia], device 9: HDMI 3 [HDMI 3] > Subdevices: 1/1 > Subdevice #0: subdevice #0 > card 1: NVidia [HDA NVidia], device 10: HDMI 4 [HDMI 4] > Subdevices: 1/1 > Subdevice #0: subdevice #0 > card 1: NVidia [HDA NVidia], device 11: HDMI 5 [HDMI 5] > Subdevices: 1/1 > Subdevice #0: subdevice #0 > card 1: NVidia [HDA NVidia], device 12: HDMI 6 [HDMI 6] > Subdevices: 1/1 > Subdevice #0: subdevice #0 > > To get sound through the monitor: > aplay -D plughw:1,7 sample.wav > > No luck on any of the other 6 devices reported. I suspect there might > be a setting somewhere on the Nvidia side that limits sound output to > one of these, and if that is so, I'd rather have the TV able to get > sound, as my computer have separate speakers and no need for the HDMI > sound output. > > Any ideas for troubleshooting this welcome. > > Regards, > Arve
Arve, I'm very sorry that when you asked this question a month ago you didn't like my answer. It was never my intention to 'derail' your question with DE or pulseaudio. That said no one else has answered that question nor have they responded to this one that you posted yesterday. I think you are in a fairly unique setup that most people don't deal with but it is an interesting area. I'd still like to help if I can. To start please run the following command and let's see what ALSA tells us: cat /proc/asound/card*/eld#0.* Good luck, Mark
