Windows Defender is very seriously going after a driver named WinRing0x64.sys -- I've seen it on 2 copies of Win11 so far. That driver is most often used by apps that control lighting or LEDs, so if something stops working, that's a good 1st place to look. It's an older file that's been known to have security vulnerabilities for years -- no clue on why Defender's going after it all of sudden. When I say it's serious about eliminating that file, I told Defender to keep it 3 times so far, and now it's gone again.
Which brings me to OpenRGB, which is the app I use that's been using WinRing0. OpenRGB is a small, portable app to control LED lighting on PCs & components. I've got 2 sticks of Corsair RAM in this PC, with light strips up their back. By default they have a neat effect where a wave of changing color moves from the bottom to the top, BUT, they lose sync after a few minutes, which drives me insane, since the PC's a couple of feet away on my desk. Rather than install the Heavy, buggy, Corsair software, I simply use OpenRGB to turn the lights off. Well, they've got a new version of OpenRGB that uses PawnIO, which replaces WinRing0 in this and several other free apps. Only added hassle is it has to be downloaded & installed separately.
openrgb[.]org/releases.html
pawnio[.]eu/