No sound on HDMI by default on Lenovo T14s using Fedora 37

[Takashi Iwai]

On Wed, 18 Jan 2023 18:05:23 +0100,
Mike FABIAN wrote:
> 
> Takashi Iwai <tiwai at suse.de> さんはかきました:
> 
> > On Wed, 18 Jan 2023 16:30:53 +0100,
> > Mike FABIAN wrote:
> >> 
> >> 
> >> With a Lenovo Thinkpad T14s (Gen1, Intel version), I tried to get sound
> >> on the monitor speakers via the HDMI cable.
> >> 
> >> It didn’t work out of the box and after a bit of googling I found:
> >> 
> >>     https://forums.lenovo.com/t5/ThinkPad-T400-T500-and-newer-T-series-Laptops/T14s-AMD-no-HDMI-audio-on-Linux/m-p/5081195?page=2
> >> 
> >> 
> >> which suggested to put
> >> 
> >>     snd_rn_pci_acp3x.dmic_acpi_check=0
> >> 
> >> on the kernel command line.
> >> 
> >> So I tried this:
> >> 
> >> $ cat /etc/modprobe.d/lenovot14s.conf 
> >> options snd-rn-pci-acp3x dmic_acpi_check=0
> >> 
> >> And that did make it work indeed.
> >> 
> >> I have no idea what this means and why this makes it work.
> >
> > The option basically should influence on the driver's behavior whether
> > to probe the built-in d-mic or not, and it has no direct relationship
> > with HDMI (supposedly via HD-audio bus), so it's puzzling how this
> > fixes the problem.
> >
> > Could you run alsa-info.sh (with --no-upload option) on both working
> > and non-working cases, and attach both outputs for comparison?
> 
> I removed /etc/modprobe.d/lenovot14s.conf but now it still works ☹
> 
> I did a “sudo dnf --enablerepo=updates-testing update”
> 
> since I last rebooted, so it is possible that an update fixed this.
> 
> So unfortunately I cannot produce a “alsa-info.sh --no-upload” output
> for the non-working case anymore (I attached the output for the working
> case *without* /etc/modprobe.d/lenovot14s.conf (i.e. without snd_rn_pci_acp3x.dmic_acpi_check=0)

Hm, I see no snd-rn-pci-acp3x module is loaded there, so something
might prevent it loaded (e.g. blacklist or such)?

And, with this state, can you use the built-in mic?  Also, how after
restoring the module option?


thanks,

Takashi