After update from 5.2.17 to 5.3.7, probing of hda codecs seems broken: kernel: snd_hda_intel 0000:00:1f.3: No response from codec, resetting bus: last cmd=0x20370503 kernel: snd_hda_intel 0000:00:1f.3: No response from codec, resetting bus: last cmd=0x201f0500 kernel: snd_hda_intel 0000:00:1f.3: No response from codec, resetting bus: last cmd=0x20270503 … repeated many times … kernel: snd_hda_codec_generic hdaudioC0D2: Unable to sync register 0x2f0d00. -11 kernel: snd_hda_intel 0000:00:1f.3: azx_get_response timeout, switching to single_cmd mode: last cmd=0x20270503 Hardware: ThinkPad T25 (should be equivalent to T470), also reported to be broken on ThinkPad X1C5 (https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=942881#3). Can be worked around by using "options snd_hda_intel probe_mask=1", but HDMI seems to no longer be detected: kernel: snd_hda_codec_realtek hdaudioC0D0: autoconfig for ALC298: line_outs=1 (0x14/0x0/0x0/0x0/0x0) type:speaker kernel: snd_hda_codec_realtek hdaudioC0D0: speaker_outs=0 (0x0/0x0/0x0/0x0/0x0) kernel: snd_hda_codec_realtek hdaudioC0D0: hp_outs=2 (0x17/0x21/0x0/0x0/0x0) kernel: snd_hda_codec_realtek hdaudioC0D0: mono: mono_out=0x0 kernel: snd_hda_codec_realtek hdaudioC0D0: inputs: kernel: snd_hda_codec_realtek hdaudioC0D0: Mic=0x18 kernel: snd_hda_codec_realtek hdaudioC0D0: Dock Mic=0x19 kernel: snd_hda_codec_realtek hdaudioC0D0: Internal Mic=0x12 kernel: input: HDA Intel PCH Mic as /devices/pci0000:00/0000:00:1f.3/sound/card0/input12 kernel: input: HDA Intel PCH Dock Mic as /devices/pci0000:00/0000:00:1f.3/sound/card0/input13 kernel: input: HDA Intel PCH Dock Headphone as /devices/pci0000:00/0000:00:1f.3/sound/card0/input14 kernel: input: HDA Intel PCH Headphone as /devices/pci0000:00/0000:00:1f.3/sound/card0/input15 Without probe_mask=1, it logs: kernel: snd_hda_codec_realtek hdaudioC0D0: autoconfig for ALC298: line_outs=1 (0x14/0x0/0x0/0x0/0x0) type:speaker kernel: snd_hda_codec_realtek hdaudioC0D0: speaker_outs=0 (0x0/0x0/0x0/0x0/0x0) kernel: snd_hda_codec_realtek hdaudioC0D0: hp_outs=2 (0x17/0x21/0x0/0x0/0x0) kernel: snd_hda_codec_realtek hdaudioC0D0: mono: mono_out=0x0 kernel: snd_hda_codec_realtek hdaudioC0D0: inputs: kernel: snd_hda_codec_realtek hdaudioC0D0: Mic=0x18 kernel: snd_hda_codec_realtek hdaudioC0D0: Dock Mic=0x19 kernel: snd_hda_codec_realtek hdaudioC0D0: Internal Mic=0x12 kernel: snd_hda_codec_generic hdaudioC0D2: autoconfig for Generic: line_outs=0 (0x0/0x0/0x0/0x0/0x0) type:line kernel: snd_hda_codec_generic hdaudioC0D2: speaker_outs=0 (0x0/0x0/0x0/0x0/0x0) kernel: snd_hda_codec_generic hdaudioC0D2: hp_outs=0 (0x0/0x0/0x0/0x0/0x0) kernel: snd_hda_codec_generic hdaudioC0D2: mono: mono_out=0x0 kernel: snd_hda_codec_generic hdaudioC0D2: dig-out=0x3/0x0 kernel: snd_hda_codec_generic hdaudioC0D2: inputs: kernel: input: HDA Digital PCBeep as /devices/pci0000:00/0000:00:1f.3/sound/card0/input11 kernel: input: HDA Intel PCH Mic as /devices/pci0000:00/0000:00:1f.3/sound/card0/input12 kernel: input: HDA Intel PCH Dock Mic as /devices/pci0000:00/0000:00:1f.3/sound/card0/input13 kernel: input: HDA Intel PCH Dock Headphone as /devices/pci0000:00/0000:00:1f.3/sound/card0/input14 kernel: input: HDA Intel PCH Headphone as /devices/pci0000:00/0000:00:1f.3/sound/card0/input15 kernel: input: HDA Intel PCH HDMI as /devices/pci0000:00/0000:00:1f.3/sound/card0/input16 And finally, on 5.2.17 it logs: kernel: snd_hda_codec_realtek hdaudioC0D0: autoconfig for ALC298: line_outs=1 (0x14/0x0/0x0/0x0/0x0) type:speaker kernel: snd_hda_codec_realtek hdaudioC0D0: speaker_outs=0 (0x0/0x0/0x0/0x0/0x0) kernel: snd_hda_codec_realtek hdaudioC0D0: hp_outs=2 (0x17/0x21/0x0/0x0/0x0) kernel: snd_hda_codec_realtek hdaudioC0D0: mono: mono_out=0x0 kernel: snd_hda_codec_realtek hdaudioC0D0: inputs: kernel: snd_hda_codec_realtek hdaudioC0D0: Mic=0x18 kernel: snd_hda_codec_realtek hdaudioC0D0: Dock Mic=0x19 kernel: snd_hda_codec_realtek hdaudioC0D0: Internal Mic=0x12 kernel: input: HDA Digital PCBeep as /devices/pci0000:00/0000:00:1f.3/sound/card0/input11 kernel: input: HDA Intel PCH Mic as /devices/pci0000:00/0000:00:1f.3/sound/card0/input12 kernel: input: HDA Intel PCH Dock Mic as /devices/pci0000:00/0000:00:1f.3/sound/card0/input13 kernel: input: HDA Intel PCH Dock Headphone as /devices/pci0000:00/0000:00:1f.3/sound/card0/input14 kernel: input: HDA Intel PCH Headphone as /devices/pci0000:00/0000:00:1f.3/sound/card0/input15 kernel: input: HDA Intel PCH HDMI/DP,pcm=3 as /devices/pci0000:00/0000:00:1f.3/sound/card0/input16 kernel: input: HDA Intel PCH HDMI/DP,pcm=7 as /devices/pci0000:00/0000:00:1f.3/sound/card0/input17 kernel: input: HDA Intel PCH HDMI/DP,pcm=8 as /devices/pci0000:00/0000:00:1f.3/sound/card0/input18 kernel: input: HDA Intel PCH HDMI/DP,pcm=9 as /devices/pci0000:00/0000:00:1f.3/sound/card0/input19 kernel: input: HDA Intel PCH HDMI/DP,pcm=10 as /devices/pci0000:00/0000:00:1f.3/sound/card0/input20 There's no C0D2 and there are multiple HDMI/DP profiles.
Do you have HDMI HD-audio codec driver module available on your system? The log message (showing "Generic") indicate that it's the generic driver being bound, not the HDMI codec driver.
Well, of course I do have the module available, what a weird suggestion! ... except you're absolutely right and I'm terribly sorry for the noise. Turns out there's something wrong with the Debian kernel build and the signature of snd-hda-codec-hdmi is corrupted: # modprobe snd-hda-codec-hdmi modprobe: ERROR: could not insert 'snd_hda_codec_hdmi': Key was rejected by service Forcing the module load fixes the problem. And this also explains why this problem was only experinced by Debian users, which was weird and I should have paid more attention to this fact. Please accept my apology for this invalid bug report, and thank you for your quick and helpful reply.
This is Debian bug report #942881, and message #20 lists a possible solution [1]. [1]: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=942881#20