Bug#1053245: fluidsynth: Fluidsynth starts at boot and blocks the sound device, no obvious way to disable it

I had the same problem and it took me quite some time to find that fluidsynth was the root cause of this. Fluidsynth was installed as new dependency from lutris 0.5.14 and blocked my sound device each ~second boot. @Patrick I could check the status with "systemctl --user status fluidsynth" an

Bug#921114: no display on GL applications

Hi Jean-Dominique, are you mixing stable and testing? As far as I can see Firmware-nonfree/20190114-1 isn't available for stable/stretch. Maybe you also need to use a newer kernel. The Debian changelog (https://tracker.debian.org/media/packages/f/firmware-nonfree/changelog-20190114-1) mention