I've this Blueretro adapter for my PS2 fat, looks like it need to be additional powered by the USB port thru cable, I've read some models may need this so I suppose it is a common issue? Also, do you know if ulaunchelf need a wired controller? Because isn't working with this adapter.

(Edit) Hmm...I'm starting to think that my ps2 has problems in working

[Solved] It was the broken ribbon cable from the controller/memcard ports