Only right audio channel on Pocket Reform?

MNT Pocket Reform
1

It seems only the right channel works on my Pocket Reform with the built-in speaker. Headphones work fine on both channels. Is that expected or is something wrong? I think the machine does this since I received it.

2
  • Which processor module?
  • Does it also happen when booting from a MicroSD card with the default System Image?
3

RK3588, 32GB
I am on the road so I don’t have a MicroSD handy. Will check at home.

4

I encountered a similar issue, I’m not sure if the default ucm profile has been changed in the last few months but I updated mine to ensure that it had mono output for the built in speaker, rather than just one channel.

This is the config I’m using:

https://git.sr.ht/~bpye/nixos-mnt-pocket-reform/tree/main/item/pkgs/linux-packages/alsa-ucm-conf-reform/ucm2/conf.d/rk3588-tlv320ai/HiFi.conf#L45

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5

I booted from a microSD, same effect. Test in GNOME sound settings works for left but not right.

6

Thanks. I have to admit that I am not sure where I would find the original version of this file on my machine that I would need to patch?

7

So /usr/share/alsa/ucm2/conf.d/rk3588-tlv320ai/HiFi.conf needs to be edited. This is the diff:

41,43d40
< cset “name=‘DAC Left Input’ Mono”
< cset “name=‘DAC Right Input’ Off”
<

So in line 41 these two lines need to be added.

That would need to be changed here:
https://source.mnt.re/reform/reform-tools/-/blob/main/audio/ucm2.conf.d/rk3588-tlv320ai/HiFi.conf

My registration for the Gitlab is pending, otherwise I would be happy to do a merge request.

Thanks @bpye for pointing out the needed correction!

8

If you don’t want to wait, send me a name and email with which you want to be mentioned as author in the git metadata and I can create a commit for you. Or send me a git-format-patch.

I’d reference "B. Pye" <hello@bpye.ca> in a Thanks field.

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9

Sorry for not getting back to you on file location, though I would have just been guessing for Debian. Glad it worked out!

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10

I chose to do it differently now.

@bpye I see that you have a few more small changes to the ucm profile. I now put everything you have into this MR:

https://source.mnt.re/reform/reform-tools/-/merge_requests/175

You are the commit author and I reference your nixos repo in the commit message. Please tell me if you’d like me to do this differently.

I’d need a review from @minute for this MR.

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