Re: [PATCH 0/3] Add Audient EVO4 support

[Christian Ruppert <arc@gmx.li>]

On Fri, Sep 25, 2026 at 11:18:33AM +0100, Faaris Ansari wrote:
> Thanks for your work on this - there is currently a regression on the latest
> kernel versions (7.2 onwards, as well as LTS kernels 6.12 and 6.18). Trying
> to set the volume in software like wpctl, or pwvucontrol causes the software
> volume to be pulled down with it - I think it's something to do with "sticky
> mixers", not completely sure.
> 
> I worked through troubleshooting it here as I originally thought it was a
> wireplumber issue:
> https://gitlab.freedesktop.org/pipewire/wireplumber/-/work_items/1022
> 
> This patch should hopefully solve that,

I'm afraid this is not going to be the case. The patch set doesn't change
anything with the pre-existing controls except for renaming the 'EVO4 '
master volume mixer to 'Master'. As a matter of fact, I made a similar
observation to yours when testing the patch set on the 'sound' kernel tree
and the (very sporadic) issue did not disappear after applying the
patches.

Unluckily, I didn't have time to investigate and as it seemed independent
from this patch set and was never observed on my (vanilla) 6.18.x
day-to-day setup, even with very recent kernels, I forgot about it. I
suspect this might be a regression in the sound-USB core modules or
possibly the the alsa core.

> and avoid the usage of external
> kernel modules like https://github.com/vanzaho/audient-evo-py (which you've
> based your work from)

This one should be solved with the patch set.

> I'm not exactly sure how the process with kernel stuff works, but
> considering a regression on current mainline as well as LTS branches for
> this device - is there some chance of fast tracking the merge of these
> patches?

The best way of supporting this (even if it only solves half of your
concerns) is probably to test it and reply with a Tested-by: tag to the
patches.