Problems with FULLSCREEN 640x480 on Ubuntu 20.04?

[Slaus]

I’ve got completely black screen after updating to Ubuntu 20.04 (from Ubuntu 18.04) (non-fullscreen though)

Black screen after Ubuntu update from 18.04 to 20.04

My program worked well on Ubuntu 18.04 with SDL2. On Ubuntu 20.04 I installed SDL2 with ‘sudo apt install libsdl2-dev’ which is version 2.0.10 - window is completely black (sound is still coming out though). Tried build/install from sources and SDL_VERSION shows 2.0.13 (for both compiled and linked) - same black screen. I use SDL2 this way: if ( SDL_Init( SDL_INIT_VIDEO | SDL_INIT_AUDIO ) < 0 ) { cerr << "Failed to SDL_Init()" << endl; return -1; } SDL_Window * sdlWindow = SDL_CreateW…