This commonly discussed problem of "dummy output" for the sound output device in ubuntu has affected me for a while now and I am not able to fix it.
I have tried many of the suggested solutions on stackoverflow and askubuntu but none of them have helped.
I am using Ubuntu 22 LTS. I noticed that whenever the "dummy output" exists one of the playback hardware device is missing. I found this out by running aplay -l and the outputs are shown below:
With sound working properly:
card 0: PCH [HDA Intel PCH], device 0: ALC256 Analog [ALC256 Analog] Subdevices: 0/1 Subdevice #0: subdevice #0card 0: PCH [HDA Intel PCH], device 3: HDMI 0 [HDMI 0] Subdevices: 1/1 Subdevice #0: subdevice #0card 0: PCH [HDA Intel PCH], device 7: HDMI 1 [HDMI 1] Subdevices: 1/1 Subdevice #0: subdevice #0card 0: PCH [HDA Intel PCH], device 8: HDMI 2 [HDMI 2] Subdevices: 1/1 Subdevice #0: subdevice #0card 0: PCH [HDA Intel PCH], device 9: HDMI 3 [HDMI 3] Subdevices: 1/1 Subdevice #0: subdevice #0When there is no sound ("dummy output"), then ALC256 Analog device is missing (device 0 above) while the rest of the HDMI devices exist in the aplay -l output.
Can anyone kindly provide some hint or direction as to what is wrong here?