I have an old Dell PowerEdge SC1420, which ceased to be a server or to have any form of RAID when I inherited it. Over the years, I've run many releases of Fedora on it, one or two of CentOS, and I disremember what all else on it.
Some OSs figure out my HP w2207h monitor on contact, even from behind the KVM switch where I normally keep it; the last few Fedora releases have been good about that, iirc.
Some OSs don't while behind the switch, but do if I shut everything down and connect the Dell directly and alone to the peripherals.
Some OSs never get it; I have had to tinker endlessly with xorg.conf a/o grub.conf.
But now F21 doesn't get it, and I can't seem to find a file that will let me tell it there is such a thing as a 27" 1680x1050 terminal. (The only plausible candidates so far open with DO NOT EDIT THIS FILE, and a reference to the other files that set them; but I'm drawing a blank about any way to reset the setting files.)
Clue, please?
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Beartooth