yep, strictly on i3 with lightdm (I installed sddm while troubleshooting this but then uninstalled it). No other DM or environment installed. I did install optimus-manager-qt though, but after installing optimus-manager my status bar is showing no tray icons besides the shutdown one, so optimus-manager-qt tray icon is not usable (yet)
So if there is no tray icon how do you switch it?
The Endeavour was worth it! You blasted off 
& you have landed. 
with the command line
sudo optimus-manager --switch
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I take it from the terminal? 
yes! the terminal, sorry
