Issue #19241 has been updated by jakit (Jakit Liang). I recheck this issue, It happened while starting with sh.exe in MSYS2. And I start sh.exe standalone and Power Mode changed. But why not happened with ruby-2.7? And I'm not sure. ---------------------------------------- Bug #19241: Ractor will change Windows System Power Mode https://bugs.ruby-lang.org/issues/19241#change-100704 * Author: jakit (Jakit Liang) * Status: Open * Priority: Normal * ruby -v: ruby 3.1.3p185 (2022-11-24 revision 1a6b16756e) [x64-mingw-ucrt] * Backport: 2.7: UNKNOWN, 3.0: UNKNOWN, 3.1: UNKNOWN ---------------------------------------- ## Problem Just start `irb`: ``` % irb irb(main):001:0> ``` And you can see Windows Power mode will change to `High Performance` ## Version `ruby 3.1.3p185 (2022-11-24 revision 1a6b16756e) [x64-mingw-ucrt]` And other version of 3.x also have this problem. ## Expected Please not change user's system settings. -- https://bugs.ruby-lang.org/