I checked my unit and IF Output is Off. Power cycling the radio does not enable it.
I took a photo with the firmware version I am using here.

Joe
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I've been chasing down an issue where my power output varies between 2 and 3W when using WSJT-X and I could not figure out why. Driving me crazy. I chased down all my connections and made sure none were loose, went through every seemingly relevant setting in WSJT-X and on the x5105. Nothing would help. And then I figured I'd turn off IF Output. And now my power is pinned at 5W.?
Can anyone explain to me what's going on here? Why does IF Output affect the power output? Annoyingly, my radio seems to default IF Output to ON everytime I turn it on, so I guess I just need to remember to change this setting every time I use it.?