No 64 bit linux downloads for 1.48.12
No left over settings in /etc, SDL appears to be working, all tests that you suggested work. Bypassed the issue by wrapping the invocation of doomlegacy within a script like so: !/bin/bash gsettings set org.mate.Marco.global-keybindings switch-to-workspace-left disabled gsettings set org.mate.Marco.global-keybindings switch-to-workspace-right disabled ./doomlegacy -IWAD tnt.wad -IWAD dogs.wad -IWAD legacy.wad -IWAD TNT31.WAD gsettings set org.mate.Marco.global-keybindings switch-to-workspace-left...
Odd video behaviour since upgrade to Fedora 36