Audio over HDMI plays too fast

[zviratko]

Hi,
my hardware is
Ryzen 2600, ASRock Tiachi Ultimate X470 motherboard
Sapphire Radeon Vega64

HDMI is connected to an LG C7V TV

This is supposed to be a NAS, co there's no X/Wayland running, but I'd like to get audio working correctly.

At the moment, all audio plays too fast. I tried mpg321 and mpv.
mpv with -ao null "plays" at the correct speed
with oss, the timer just runs fast and the audio is too fast also.

I tried changing rates (dev.pcm.1.play.vchanrate etc.) and while I can get it to play @22050 (and the lower quality is audible) it does nothing to the speed of the audio.

If I had to guess, I'd say it plays at about 200% of normal speed.

Any hints on troubleshooting/debugging this?

Thank you

[zviratko]

I found a "workaround"
If I enable Deep Colour on the TV for this HDMI port, audio works just fine.
If I switch it back off, audio is too fast again.

The problem with that is, thay I get no picture before amdgpu is loaded, neither in BIOS or efifb, so that's not really a way for me.

I have no idea what's going on, it is not actually running with HDR anyway...

Now I tried connecting the HDMI to my Soundbar, audio works fine but I only get 1920x1080 instead of 4K. Not a big deal.

However, I still think it should be fixed.... unless the problem is in the TV ;-)

[valpackett]

hm, my vega doesn't play audio (over displayport) at all right now. (Used to work in the past, maybe on an RX 480 though..)

Did you configure any tunables like compat.linuxkpi.amdgpu_hw_i2c?

If I enable Deep Colour on the TV for this HDMI port, audio works just fine

Interesting. Does this happen on other operating systems?

This is supposed to be a NAS

A Vega in a NAS? Are you going to mine cryptocurrency on it or something? :)

[zviratko]

I did not try any of these tunables, only dev.pcm.1, hw.snd... (with absolutely no effect).

Interesting. Does this happen on other operating systems?

No idea, I think it worked fine on Ubuntu (18.04? 20.04? I know I tried it once, then never used it).

A Vega in a NAS? Are you going to mine cryptocurrency on it or something? :)

I had W10 vitualized with GPU passthrough working (no idea if I can resurrect it on FreeBSD, yet). Hardly used it, though, so then it was hashcat, some crypto stuff, folding@home... But the main problem why I got it was because it was known to work fine in EFI, while my old 1060 did not work with efifb (not even BIOS had a picture without CSM).

[hselasky]

Could you dump dmesg?

[zviratko]

Sorry for the delay, I've been on a rather long holiday :-)
I updated to the most recent CURRENT and updated to drm-devel-kmod-5.2.g20200602
HDMI is now directly connected to the TV. HDMI Ultra Deep Color (AKA HDR) is DISABLED.
Music still plays too fast.

dmesg attached
dmesg.txt