On Wed, 22 May 2019 14:33:05 -0000, you wrote:
I have two raspberry 3+. I installed on one of them OSMC and use it as Media Center in my home. Power PSU is 5V 2A. and it works like charm. I installed on another one Fedora Server 30 and I want to use as a server in my home. Power PSU is 5V 3A. but it has some problem and I am sure will be fixed. when I change PSU and use 5V 2A for Fedora Server, it boots and after I see some booting messages. Fedora Server reboot and I can not log in to Fedora Server. Can I find options for normalization of power in Fedora server for work better on Pi 3. by use PSU 5V 2A. I want to find way my Fedora Server can work by PSU 5V 2A.
From what I can see on the Raspberry Pi web pages they require a 2.5A power supply.
That would seem to indicate that while you may have been lucky getting one working on a 2A PSU it isn't supported and thus unlikely anything that can be solved by changing anything in Fedora.