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Pipewire is not an app, it’s a system service. It’s not like people are going to say, “i’m gonna install pipewire” and then go install pipewire and also happen to have stats from before and after that installation.
Most people who have pipewire have it either by having it already installed as part of the initial installation or part of some larger update, but in either case, they probably aren’t particularly aware of it, especially as long as things are functional.
To answer the question whether it affects one’s system requires a different strategy than and likely a little bit of research.
Depends on your distribution. I guess most of them use pipewire nowadays, and the bug has not been fixed yet so… if you are using a common GNU/Linux distro, the bug is likely on your system.
Does it affect you, well, from what I understood, as long as your system registers the camera and pipewire is running, your camera is going to waste energy regardless of whether it’s actively streaming video or not.
From what I’ve understood there are several workarounds, each bad but in a different way:
In either case, it’s also worth noting that whatever app you are using the camera with is likely to keep a “list of cameras” and some sort of memory of your last selection. In theory, disabling or enabling a camera should work fine, but it’s not uncommon that apps will have bugs when managing the list; for example an app might not “see” the camera being back on, etc. so if you are going to use any of the above you might need to get used to restarting an app from time to time.
Assuming that eventually this bug is going to be fixed, the question of when it will be available for your system, again, depends on the distribution you are using. Many distributions have own public bug trackers so you could try and look it up and watch their ticket (in some cases, some distributions might even have fixes available sooner than the bug is fixed upstream, but I would not count on that), or you can try and talk to the community (look for an IRC/matrix channel, discord server, etc.)