8i6 3rd gen: simple.c:920: snd_mixer_selem_get_enum_items: Assertion `elem' failed

[thomasheartman]

Hi! 👋🏼 Thanks for what appears to be an incredibly useful package for using the Scarlett interfaces on Linux! 🙏🏼

Issue

When trying to start this up with a 3rd gen 8i6 interface connected, I get the following output:

scarlett-mixer: simple.c:920: snd_mixer_selem_get_enum_items: Assertion `elem' failed.
fish: Job 1, 'scarlett-mixer' terminated by signal SIGABRT (Abort)

When running it with a double --verbose flag, I get this output:

* hw:0 "Scarlett 8i6 USB"
Autodetect: Using "hw:0"
CMP 8
--- Device: Scarlett 8i6 USB
Matrix: in=0, out=0, off=0, stride=0
Matrix: input-select=0, select-stride=0
Inputs: ins=0 select-offset=0
Masters: n_mst=0 n_out-select=0
Switches: n_pad=0, n_hiz=0
hiz_map = {-1, -1, };
pad_map = {-1, -1, -1, -1, };
out_gain_map = {-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, };
out_gain_labels = {, , , , , , , , , , };
out_bus_map = {-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, };
---
--- Device: Scarlett 8i6 USB
Matrix: in=8, out=8, off=20, stride=8
Matrix: input-select=84, select-stride=1
Inputs: ins=10 select-offset=0
Masters: n_mst=0 n_out-select=6
Switches: n_pad=2, n_hiz=2
hiz_map = {15, 18, };
pad_map = {16, 19, -1, -1, };
out_gain_map = {10, 11, 12, 13, -1, -1, -1, -1, -1, -1, };
out_gain_labels = {Headphone 1L, Headphone 1R, Headphone 2L, Headphone 2R, SPDIF/L, SPDIF/R, , , , , };
out_bus_map = {92, 93, 94, 95, 97, 98, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, };
---
scarlett-mixer: simple.c:920: snd_mixer_selem_get_enum_items: Assertion `elem' failed.
fish: Job 1, 'scarlett-mixer --verbose --verb…' terminated by signal SIGABRT (Abort)

Do you know what might be going wrong here?

Technical details

• OS: NixOS 22.11
• Computer: Dell XPS 15
• Interface: Focusrite Scarlett 8i6 3rd gen

Additional question

Regarding the meson build: I've never used that system before, so I had some issues with it not installing correctly. I got some help and by adding install: true to the executable funcion, it installs correctly. I don't know if this is an issue on non-NixOS systems, but I was wondering whether it's something you'd accept a PR for if it's interesting? If not, I'll just leave it in my fork 🤷🏼