Macbook pro 2011 Late cannot enable dGPU again
After the steps below, I'm seeing again both graphics cards in &quot;About This Mac&quot; of my MacBookPro 17&quot; Late 2011, running Catalina Patcher. See 

Shut down the computer.
Plug in the power adapter to a power source if it's not already connected.
Press Control+Option+Shift+Power keys to reset the SMC
Boot and press Control+S immediately after you hear the startup sound.
Then enter this command:
nvram fa4ce28d-b62f-4c99-9cc3-6815686e30f9:gpu-power-prefs=%00%00%00%00
Then type 'exit' to reboot.
Then shut down again the computer.
Boot and press and hold the Command+Option+P+R immediately after you hear the startup sound.
Hold these keys until the computer restarts and you hear the startup sound for a second time.