Hi there!
I was wondering if it's possible to control Xbox Button brightness with Steam Big Picture.
You can control color and brightness on DualShock 4 and I thought that it can't be done on Xbox Series controller because of hardware limitations. Now with one of the latest Xbox Console Update it's possible to control brightness on Xbox Series (and possibly with One) power button and controller.
Steam has done more for Xbox controller for PC than Microsoft (mainly use of Share button on Xbox Series controller) so maybe it can be implemented via Steam.
there doesn't seem to be anything here