Arch Linux

michelesr

Member

Registered: 2016-02-04

Posts: 73

Ardour 9: Some LV2 plugins GUI fail to be opened again once closed

The first time you open a LV2 plugin UI it works fine. If you then close the GUI and open it again, you get something like this:

suil error: Failed to instantiate UI <http://gareus.org/oss/lv2/avldrums#ui_gl> in /usr/lib/lv2/avldrums.lv2/avldrumsUI_gl.so

For ZynAddSubFx, it's even worse, as you get a SIGSEGV (null view pointer) :

#0  DGL::puglGetNativeWindow (view=0x0) at /usr/src/debug/zynaddsubfx/zynaddsubfx-3.0.6/DPF/dgl/src/pugl-upstream/src/x11.c:1287
1287	  return (PuglNativeView)view->impl->win;
[Current thread is 1 (Thread 0x7f7083fbcb00 (LWP 12))]

Upstream issue: https://gitlab.com/lv2/suil/-/work_items/12 (with attached stack trace)

michelesr

Member

Registered: 2016-02-04

Posts: 73

Re: Ardour 9: Some LV2 plugins GUI fail to be opened again once closed

Got my anwser: https://discourse.ardour.org/t/solved-a … =michelesr

It appears to be an issue with mesa, installing mesa-git fixed it. However I don't know why the regular mesa package is broken.

sekret

Member

Registered: 2013-07-22

Posts: 307

Re: Ardour 9: Some LV2 plugins GUI fail to be opened again once closed

However I don't know why the regular mesa package is broken.

Because the fix hasn't been included yet?

michelesr

Member

Registered: 2016-02-04

Posts: 73

Re: Ardour 9: Some LV2 plugins GUI fail to be opened again once closed

However I don't know why the regular mesa package is broken.

Because the fix hasn't been included yet?

Well, possibly. However I'm not sure, since some user reported this being fixed on mesa-git 25.3.0, and Arch mesa package is currently at 26.0.4, so it should already include the fix?
But mesa-git provides more than the mesa package only (e.g. it replaces vulkan-intel and others). Hopefully it is just a question of waiting.

https://discourse.ardour.org/t/solved-a … w/112213/5
https://discuss.cachyos.org/t/ardour-8- … os/15781/3

Last edited by michelesr (2026-04-15 21:32:10)