Second monitor not displaying anything on boot (Fedora 25)
 

Whenever I boot into Fedora, only one of the two monitors I have turns on. As it happens, it's the one that Fedora marked as the primary monitor. The only way for my to get it to turn on is to suspend the computer for a few seconds. Once leaving suspend state, everything is normal, but I have to do this every time.

This doesn't seem to happen under any other condition.

Is there a hardware key combination to control the display usage (on my laptop, it's Fn-F2--the F2 key has a little icon that's supposed to represent two screens)? If so, have you tried cycling through that to see what it does?

I don't think I have anything like that. Nothing obvious to me, at least. Everything is secondary, though: the desktop is from 2011/2012, the monitors from 2014, the keyboard from earlier this year.