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With Lazarus I ran into the issue that controls would not always show when running under Linux (Wayland) using Qt5.
Seems you need to force the Lazarus app to use "xcb" instead of "wayland" (note: I'm far from an expert on this topic!).
This is how I fixed it:
I created a unit which has its initialization started before the widget set is started, and sets the environment variable for QT_QPA_PLATFORM (see also: Qt docs).
1) Create a unit to set the environment to use "xcb".
unit QtPlatformFix;
{$mode objfpc}{$H+}
interface
implementation
{$IFDEF LCLQt5}
function setenv(name, value: PChar; overwrite: Integer): Integer; cdecl; external;
{$ENDIF}
initialization
{$IFDEF LCLQt5}
setenv('QT_QPA_PLATFORM', 'xcb', 1);
{$ENDIF}
end.
2. In the project file (LPR) add the unit, so its one of the first things to be executed.
program RenameMyTVSeries;
{$mode objfpc}{$H+}
uses
{$IFDEF UNIX}{$IFDEF UseCThreads}
cthreads,
{$ENDIF}{$ENDIF}
{$IFDEF LCLQt5}
QtPlatformFix, // <---- add this
{$ENDIF}
Interfaces, ...
What is xcb?
A C-language library designed to replace the older Xlib library for communicating with the X11 display server on Unix-like and Linux operating systems