Sometimes launching a game results in a black screen

[kivutar]

It happens randomly that launching a pcsx_rearmed ROM on the RPi results in a black screen.
I have no idea why.
It happened when launching games from the playlist, with Ludo launched from systemd.

[kivutar]

Maybe due to audio:

Jan 16 10:02:36 LudOS ludo[528]: 2019/01/16 10:02:36 [INFO]: NstDatabase.xml path: /storage/system/NstDatabase.xml
Jan 16 10:02:36 LudOS ludo[528]: 2019/01/16 10:02:36 [WARN]: NstDatabase.xml required to detect region and some mappers.
Jan 16 10:02:36 LudOS ludo[528]: 2019/01/16 10:02:36 [INFO]: [Nestopia]: Machine is NTSC.
Jan 16 10:02:36 LudOS ludo[528]: ALSA lib /datadrive/LudOS/build.LudOS-RPi2.arm-1.0-devel/alsa-lib-1.1.7/src/pcm/pcm_direct.c:1193:(snd1_pcm_direct_initialize_slave) requested or auto-format is not available
Jan 16 10:02:36 LudOS ludo[528]: ALSA lib /datadrive/LudOS/build.LudOS-RPi2.arm-1.0-devel/alsa-lib-1.1.7/src/pcm/pcm_dmix.c:1111:(snd_pcm_dmix_open) unable to initialize slave
Jan 16 10:02:36 LudOS ludo[528]: AL lib: (EE) ALCplaybackAlsa_open: Could not open playback device 'default': Invalid argument
Jan 16 10:02:36 LudOS ludo[528]: 2019/01/16 10:02:36 al: cannot open the default audio device
Jan 16 10:02:36 LudOS ludo[528]: 2019/01/16 10:02:36 [OpenAL]: Using 4 buffers of 4096 bytes.
Jan 16 10:02:36 LudOS ludo[528]: 2019/01/16 10:02:36 [Core]: Game loaded: /storage/roms/Nintendo - Nintendo Entertainment System/Bomberman (USA).zip
Jan 16 10:02:36 LudOS ludo[528]: 2019/01/16 10:02:36 [Core]: open /storage/savefiles/Bomberman (USA).srm: no such file or directory

And when the bug doesn't manifest:

Jan 16 11:44:49 LudOS ludo[564]: 2019/01/16 11:44:49 [Core]: Core loaded: Nestopia
Jan 16 11:44:49 LudOS ludo[564]: 2019/01/16 11:44:49 [INFO]: Custom palette path: /storage/system/custom.pal
Jan 16 11:44:49 LudOS ludo[564]: 2019/01/16 11:44:49 [WARN]: custom.pal not found in system directory.
Jan 16 11:44:49 LudOS ludo[564]: 2019/01/16 11:44:49 [INFO]: NstDatabase.xml path: /storage/system/NstDatabase.xml
Jan 16 11:44:49 LudOS ludo[564]: 2019/01/16 11:44:49 [WARN]: NstDatabase.xml required to detect region and some mappers.
Jan 16 11:44:49 LudOS ludo[564]: 2019/01/16 11:44:49 [INFO]: [Nestopia]: Machine is NTSC.
Jan 16 11:44:49 LudOS ludo[564]: 2019/01/16 11:44:49 [OpenAL]: Using 4 buffers of 4096 bytes.
Jan 16 11:44:49 LudOS ludo[564]: 2019/01/16 11:44:49 [Core]: Game loaded: /storage/roms/Nintendo - Nintendo Entertainment System/Bomberman (USA).zip
Jan 16 11:44:49 LudOS ludo[564]: 2019/01/16 11:44:49 [Core]: open /storage/savefiles/Bomberman (USA).srm: no such file or directory

Using LudOS I also was getting a black screen for PS1 games. using 1.0 Alpha30 build