Hello,
I am trying to solve this problem for some times but couldn’t find a way of doing it. This problem is VERY annoying.
I was using an external dac for many years. The new one i am using have a lot of latency (built for music not movie…). So i want to use the sound from my TV. It’s a LG CX oled, with HDMI 2.1. I also have a DP monitor (dual monitor in kde is a nightmare, but it’s another story…).
HDMI output from my graphic card is divided in subdevice. In fact Alsa do not even recognize them as subdevice, and it seems completely different of what i have in my playback device in kde sound applet :
**** Liste des périphériques matériels PLAYBACK ****
carte 0 : J20 [JLsounds Hi-Rez Audio 2.0], périphérique 0 : USB Audio [USB Audio]
Sous-périphériques : 1/1
Sous-périphérique #0 : subdevice #0
carte 1 : HDMI [HDA ATI HDMI], périphérique 3 : HDMI 0 [PHL 245E1]
Sous-périphériques : 1/1
Sous-périphérique #0 : subdevice #0
carte 1 : HDMI [HDA ATI HDMI], périphérique 7 : HDMI 1 [HDMI 1]
Sous-périphériques : 1/1
Sous-périphérique #0 : subdevice #0
carte 1 : HDMI [HDA ATI HDMI], périphérique 8 : HDMI 2 [HDMI 2]
Sous-périphériques : 1/1
Sous-périphérique #0 : subdevice #0
carte 1 : HDMI [HDA ATI HDMI], périphérique 9 : HDMI 3 [LG TV SSCR2]
Sous-périphériques : 1/1
Sous-périphérique #0 : subdevice #0
carte 1 : HDMI [HDA ATI HDMI], périphérique 10 : HDMI 4 [HDMI 4]
Sous-périphériques : 1/1
Sous-périphérique #0 : subdevice #0
carte 1 : HDMI [HDA ATI HDMI], périphérique 11 : HDMI 5 [HDMI 5]
Sous-périphériques : 1/1
Sous-périphérique #0 : subdevice #0
carte 2 : Generic [HD-Audio Generic], périphérique 0 : ALC1220 Analog [ALC1220 Analog]
Sous-périphériques : 1/1
Sous-périphérique #0 : subdevice #0
Strangely in my kde sound applet i have the choice between HDMI Output (not working). HDMI 4 Stereo and 5.1 and 7.1.
The problem is i only get sound from my TV with HDMI 4 stereo, and whatever i do it always failback to HDMI 1. If the pc go in screen saving, or if i simply power off (or power on also…) the dp monitor.
In fact it failback to the JLsounds usb, but behavior is the same if it’s not connected, it always go back to hdmi 1 every time it can…
And sometimes HDMI 4 is not in the playback device and it’s call HDMI 2 instead…
No way to disable these useless hdmi output in alsamixer, and i tried to use pipewire over pulse and it’s not working better.
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