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=2which suggested to put
snd_rn_pci_acp3x.dmic_acpi_check=0on 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?
thanks,
Takashi