GZDoom freezes on Linux Mint 20.1 Xfce after intro music ends

[palaciodaniel]

Problem
No error is raised, simply the buttons stop responding at all. The only thing that works is hovering the mouse, but clicking doesn't do anything. I have to force-quit GZDoom by opening a Terminal and using "xkill".

Log
I initialized GZDoom by using the Terminal, and I captured this error log.

fluidsynth: warning: SDL2 not initialized, SDL2 audio driver won't be usable
(gzdoom:12073): GLib-GObject-WARNING **: 04:34:57.437: cannot register existing type 'IpatchSplitsType'
(gzdoom:12073): GLib-GObject-CRITICAL **: 04:34:57.437: g_param_spec_enum: assertion 'G_TYPE_IS_ENUM (enum_type)' failed
** (gzdoom:12073): CRITICAL **: 04:34:57.437: ipatch_type_install_property: assertion 'G_IS_PARAM_SPEC(prop_spec)' failed
(gzdoom:12073): GLib-GObject-CRITICAL **: 04:34:57.437: g_boxed_type_register_static: assertion 'g_type_from_name (name) == 0' failed
(gzdoom:12073): GLib-GObject-WARNING **: 04:34:57.437: cannot register existing type 'IpatchSF2GenType'
(gzdoom:12073): GLib-GObject-WARNING **: 04:34:57.437: cannot retrieve class for invalid (unclassed) type ''
** (gzdoom:12073): CRITICAL **: 04:34:57.437: file /build/libinstpatch-i701yY/libinstpatch-1.1.2/libinstpatch/IpatchSF2Gen.c: line 148 (_ipatch_sf2_gen_init): assertion `enum_class != NULL' failed.
(gzdoom:12073): GLib-GObject-WARNING **: 04:34:57.438: cannot register existing type 'IpatchSample'
(gzdoom:12073): GLib-GObject-WARNING **: 04:34:57.438: cannot register existing type 'IpatchItem'
(gzdoom:12073): GLib-GObject-CRITICAL **: 04:34:57.438: g_type_interface_add_prerequisite: assertion 'G_TYPE_IS_INTERFACE (interface_type)' failed
(gzdoom:12073): GLib-GObject-WARNING **: 04:34:57.438: cannot register existing type 'IpatchSF2GenItem'
(gzdoom:12073): GLib-GObject-WARNING **: 04:34:57.438: cannot register existing type 'IpatchItem'
(gzdoom:12073): GLib-GObject-CRITICAL **: 04:34:57.438: g_type_interface_add_prerequisite: assertion 'G_TYPE_IS_INTERFACE (interface_type)' failed
(gzdoom:12073): GLib-GObject-WARNING **: 04:34:57.438: cannot register existing type 'IpatchSF2ModItem'
(gzdoom:12073): GLib-GObject-WARNING **: 04:34:57.438: cannot register existing type 'IpatchItem'
(gzdoom:12073): GLib-GObject-CRITICAL **: 04:34:57.438: g_type_interface_add_prerequisite: assertion 'G_TYPE_IS_INTERFACE (interface_type)' failed
(gzdoom:12073): GLib-GObject-WARNING **: 04:34:57.438: cannot register existing type 'IpatchSF2VoiceCache'
(gzdoom:12073): GLib-GObject-WARNING **: 04:34:57.438: cannot retrieve class for invalid (unclassed) type ''
(gzdoom:12073): GLib-GObject-WARNING **: 04:34:57.438: cannot register existing type 'IpatchItem'
(gzdoom:12073): GLib-GObject-CRITICAL **: 04:34:57.438: g_type_register_static: assertion 'parent_type > 0' failed
(gzdoom:12073): GLib-GObject-CRITICAL **: 04:34:57.438: g_type_register_static: assertion 'parent_type > 0' failed
(gzdoom:12073): GLib-CRITICAL **: 04:34:57.438: g_once_init_leave: assertion 'result != 0' failed
(gzdoom:12073): GLib-GObject-WARNING **: 04:34:57.438: cannot retrieve class for invalid (unclassed) type ''
(gzdoom:12073): GLib-GObject-WARNING **: 04:34:57.438: cannot register existing type 'IpatchItem'
(gzdoom:12073): GLib-GObject-CRITICAL **: 04:34:57.438: g_type_register_static: assertion 'parent_type > 0' failed
(gzdoom:12073): GLib-GObject-WARNING **: 04:34:57.438: cannot retrieve class for invalid (unclassed) type ''
(gzdoom:12073): GLib-GObject-WARNING **: 04:34:57.438: cannot register existing type 'IpatchConverter'
(gzdoom:12073): GLib-GObject-WARNING **: 04:34:57.438: cannot retrieve class for invalid (unclassed) type ''

Solution
This doesn't patch the underlying problem, but if you go to Sound Options and select OPL Synth Emulation on Midi Device before the intro song ends, everything starts working flawlessly.

[coelckers]

This is a known issue with a broken FluidSynth version shipped with some Linux distributions. I am sorry but this is something we cannot fix ourselves. The only way to get around this is to switch MIDI devices or update FluidSynth from an external source.