Sound is not a general problem. Notebooks can be special in different degrees.

A bit of googling:
Ubuntu seems to produce custom images for the Latitude 3420. https://ubuntu.com/certified/202101-28600
There was a question about missing sound here: https://askubuntu.com/questions/1291829 … -ubuntu-20
Not exactly the same model, maybe the answer applies to your case too.

Don't know either, there should be no problem with 5.10. Alsa devices are looking good too.

I did a bit of testing, but have no speaker connected to any HDMI output ... .
I temporary installed pulsaudio, and could switch to a HDMI output device. The config was present.
qasmixer shows no level-fader for the HDMI audio output.

The generic name for the current kernel is "linux-image-amd64"

$ sudo apt install linux-image-amd64

should install daedalus' kernel 6.1.

You mentioned the kernel version: 5.10 is chimaera, daedalus has 6.1 and I would use this. Maye the old kernel is still booted as default for some reason?

The following command shows all sound devices on my box:

 $ cat  /proc/asound/pcm
00-00: ALC1150 Analog : ALC1150 Analog : playback 1 : capture 1
00-01: ALC1150 Digital : ALC1150 Digital : playback 1
00-02: ALC1150 Alt Analog : ALC1150 Alt Analog : capture 1
01-03: HDMI 0 : HDMI 0 : playback 1
01-07: HDMI 1 : HDMI 1 : playback 1

That's all I got ...

Just recognised:

root@devuan:~# ssh devuan  

is (herer) equal to

root@devuan:~# ssh root@devuan

To login with a non-roor-user:

root@devuan:~# ssh your-non-root-user@devuan

Does this work?

Good morning. Not sure about the question, there is systemctl in devuan. I usually do

$ sudo apt install task-ssh-server

to have ssh server installed and running.

EDIT:
Ooops, I messed this up entirely:  "... there is no systemctl in my devuan" is correct.

I would fix /etc/fstab first:
  a) the error in line 1
  b) temporary comment-out all non-linux filesystems

And try a live system (knoppix, or whatever you prefer) to confirm the hardware is ok.
Are there other OS'es, and if so do they show errors too?

Is it a new or an old installation?
If it is new one, I probably would just re-install. Or maybe trying to update to daedalus.

Of course not.
But this is what you get, when using the linked installation instructions on chimaera.

Let's say there was a temptation to suggest "wouldn't you like to do a dist-upgrade to daedalus?", instead of answering the question.

Some thoughts:
Correct BIOS time and non-fucntional RTC sounds contrary. Both are the same device, aren't they?

Debian shows correct time: Probably systemd-timesync forces a clock-update. ntpd could do so too with addional switches. google found e.g. https://askubuntu.com/questions/254826/ … -using-ntp

cat /proc/interrupts|grep -i rtc on my 97x-based mainboard looks almost equal, only one of the four zeros is not zero. Just to mention, whatever it means.

Thanks for the info - I was not aware of that possibilty.

At least there is nothing strange happening, as thought before.

Looks like they don't have a devuan repository. You may interchange 'chimaera' with 'bullseye' in 'nginx.list', using an edior or e.g.:

$ sudo sed -i 's/chimaera/bullseye/g' /etc/apt/sources.list.d/nginx.list

Most commercial DVDs are encrypted with "css" and decryption libraries are needed to play them.
I remember remarks on the vlc web site (dvdcss or decss). The DVD-player-software loads the library(s), if present. css is broken since years and some keys are public, even printed on T-shirts. Not sure about the current legal state, but I don't think this will ever make it into debian officially.

"non-free-firmware" was separeted in the upcomming Debian release.
It is the essential (non avoidable) part of non-free software, which is needed for some pieces of hardware to function at all.