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I'm running CentOS 7 with pulseaudio. Due to a bug in my monitor firmware, I must send audio over the displayport audio as 24 or 32 bit (not 16bit which causes audio failure on the monitor).

How can I tell what audio resolution is currently in use by Linux? And how can I force it to 24/32 bit?

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Can't think of a simple way to do it.

I'd try to use hw or slave ALSA plugin for force the format to 24/32 bit. Test that first directly with ALSA, with Pulseaudio stopped (pasuspender etc., aplay -D). Then use the module-alsa-sink Pulseaudio module to create a Pulseaudio sink for it (pacmd load-module). You may have to modify the module-udev-detect call in /etc/pulse to ignore the old ALSA hardware, if this doesn't happen automatically.

(Very general advice, I'd have to try it out myself for a step-by-step description).

pacmd list-sinks and pacmd list-sink-inputs have a sample spec field that designates bitwidth used, but I am not sure how accurate that is given the various conversions at various places involved.

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And how can I force it to 24/32 bit?

In /etc/pulse/daemon.conf set

default-sample-format = s24ne

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