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Cannot get Vital linux VST to load on NixOS

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Assessment

Difficulty
4/5
Estimated time
3-5 days
Newbie friendliness
48/100
Issue type
Bug
Clarity
Mostly clear
Activity status
Active
Tech stack
linux, nixos
Domain
audio-video-rtc, desktop

Research direction

Start by reproducing the failure with Vital from /run/current-system/sw/lib/vst and /run/current-system/sw/lib/vst3 using Vestige, then try the Carla plugin path and capture the reported crashes. Compare the output from both paths and verify that Vital loads and functions without LMMS freezing, crashing, or reporting a missing entry point.

Written by the indexing model from the issue text.

Description

bug
System Information

NixOS 26.05 Linux 7.2.6 Sway (Wayland)

LMMS Version(s)

1.2.2-unstable-2026-04-21 from nixpkgs (26.05)

Most Recent Working Version

No response

Bug Summary

Cannot get Vital to load with carla nor vestige on NixOS, either crashes or fails to load

Expected Behaviour

Vital should load correctly and function as expected

Steps To Reproduce

With vestige

  1. Add the plugin from /run/current-system/sw/lib/vst or /run/current-system/sw/lib/vst3
  2. You should get the following output depending on from which directory the plugin shared library was loaded:
unique ID: Vita
RemotePlugin::DebugMessage: inputs: 0; outputs: 2
RemotePlugin::DebugMessage: creating editor
Error while reading.
Process error:  QProcess::Crashed
Remote plugin crashed
Starting detached.

RemotePlugin::DebugMessage: could not find entry point
QProcess: Destroyed while process ("/nix/store/zn1m90dsgzwglf20ahz9wl459362lyw0-lmms-1.2.2-unstable-2026-04-21/lib/lmms/NativeLinuxRemoteVstPlugin64") is still running.

With carla

  1. Add the following plugin path: /run/current-system/sw/lib/vst3
  2. Add Vital plugin
  3. LMMS freezes for a couple seconds
  4. You should get the following output:
[carla] Trying to start carla-plugin using "/nix/store/7ap6fsppwrz6xp8bphhqf444x1wwbriy-carla-2.5.10/share/carla/resources/carla-plugin"
LRDF Support not available (LADSPA-RDF will be disabled)
Carla 2.5.10 started, status:
  Python version: 3.13.15
  Qt version:     5.15.19
  PyQt version:   5.15.10
  Binary dir:     /nix/store/7ap6fsppwrz6xp8bphhqf444x1wwbriy-carla-2.5.10/lib/carla
  Resources dir:  /nix/store/7ap6fsppwrz6xp8bphhqf444x1wwbriy-carla-2.5.10/share/carla/resources
Frontend pixel ratio is 1.0
qt.qpa.wayland: Wayland does not support QWindow::requestActivate()
qt.qpa.wayland: Wayland does not support QWindow::requestActivate()
[1]    15071 segmentation fault (core dumped)  lmms
                                                                    
aceinet-nix git:master*  199s
❯ Got SIGTERM -> Closing now
CarlaPipeCommon::_writeMsgBuffer(..., 8) - failed with -1 (false), message was:
exiting
Logs

No response

Screenshots / Minimum Reproducible Project

No response

Please search the issue tracker for existing bug reports before submitting your own.
  • I have searched all existing issues and confirmed that this is not a duplicate.
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Getting set up

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First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

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