@Alberto: Thanks a lot for your help! There is no such setting in the BIOS of the Thinkpad X1 Extreme. I can either select discrete only or hybrid cards. I was finally able to get prime-select to switch to intel but the rate remains at like 20W which is essentially the same as using the nvidia card. I am also not able to connect to an external screen via the on-board HDMI port which is another issue I never had to deal with in a Thinkpad (usb-c to HDMI adapter does not work as well).
@Alberto: Thanks a lot for your help! There is no such setting in the BIOS of the Thinkpad X1 Extreme. I can either select discrete only or hybrid cards. I was finally able to get prime-select to switch to intel but the rate remains at like 20W which is essentially the same as using the nvidia card. I am also not able to connect to an external screen via the on-board HDMI port which is another issue I never had to deal with in a Thinkpad (usb-c to HDMI adapter does not work as well).