I am a new comer to Mint . I have spent years on Fedora and RH products , only familiar with Debian based systems from a distant.
I installed M 21.2 on a Macpro41 , 2021 model. It came with 5.15 kernel.
I updated kernel 6.5.0-25-generic #25~22.04.1 after seeing a online posting that would cure my "DUMMY OUTPUT " status of my audio device.
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# journalctl -k | grep -Ei "ALSA|HDA|sof[-]|HDMI|snd[_-]|sound|hda.codec|hda.intel"
Mar 14 18:56:07 warbaby kernel: snd_hda_intel 0000:00:1f.3: bound 0000:00:02.0 (ops i915_audio_component_bind_ops [i915])
Mar 14 18:56:07 warbaby kernel: snd_hda_codec_cs8409 hdaudioC0D0: autoconfig for CS8409: line_outs=2 (0x24/0x25/0x0/0x0/0x0) type:speaker
Mar 14 18:56:07 warbaby kernel: snd_hda_codec_cs8409 hdaudioC0D0: speaker_outs=0 (0x0/0x0/0x0/0x0/0x0)
Mar 14 18:56:07 warbaby kernel: snd_hda_codec_cs8409 hdaudioC0D0: hp_outs=1 (0x2c/0x0/0x0/0x0/0x0)
Mar 14 18:56:07 warbaby kernel: snd_hda_codec_cs8409 hdaudioC0D0: mono: mono_out=0x0
Mar 14 18:56:07 warbaby kernel: snd_hda_codec_cs8409 hdaudioC0D0: inputs:
Mar 14 18:56:07 warbaby kernel: snd_hda_codec_cs8409 hdaudioC0D0: Internal Mic=0x44
Mar 14 18:56:07 warbaby kernel: snd_hda_codec_cs8409 hdaudioC0D0: Mic=0x3c
Mar 14 18:56:07 warbaby kernel: input: HDA Intel PCH HDMI/DP,pcm=3 as /devices/pci0000:00/0000:00:1f.3/sound/card0/input7
Mar 14 18:56:07 warbaby kernel: input: HDA Intel PCH HDMI/DP,pcm=7 as /devices/pci0000:00/0000:00:1f.3/sound/card0/input8
Mar 14 18:56:07 warbaby kernel: input: HDA Intel PCH HDMI/DP,pcm=8 as /devices/pci0000:00/0000:00:1f.3/sound/card0/input9
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# play -l
**** List of PLAYBACK Hardware Devices ****
card 0: PCH [HDA Intel PCH], device 3: HDMI 0 [HDMI 0]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 0: PCH [HDA Intel PCH], device 7: HDMI 1 [HDMI 1]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 0: PCH [HDA Intel PCH], device 8: HDMI 2 [HDMI 2]
Subdevices: 1/1
Subdevice #0: subdevice #0
There are some online references to "audio" problems on a Mac-pro .. none address a solution.
This looks to me like a kernel problem since the device is being labeled a "DUMMY OUTPUT "
Please help me .
Thanks
JD