@mitu said in Unable to set control mapping in Dolphin, dolphin-emu not loading.:
I forgot to mention - you need to be in a desktop session for it to work, the command line command should be launched from a graphical terminal (like xterm or lxterm) and not from the console. Did you use Dolphin before ?
This was the fix!
Steps I took:
-installed the 'desktop' package located in retropie-setup
-opened command and typed startx to load into desktop
-opened the terminal in the desktop with a mouse
-entered QT_QPA_PLATFORM=xcb /opt/retropie/emulators/dolphin/bin/dolphin-emu
dolphin-gui loaded just fine and I was able to find my controller in the dropdown.
Thank you for the help!