(See original ticket from @mpearson in fedora-workstation#360 for context)

For OEM energy certifications, we need computers to automatically suspend when plugged in at around 15~20 minutes by default.

We currently configure screen dimming at 5 minutes, and screen energy saving at 10 minutes. I would like to propose that we default to sleeping the system at 15 minutes.

:thumbsup:

This probably makes sense as an upstream KDE Plasma default.

cc: @ngraham

:thumbsup:

Note from @apol: this is where the defaults are stored: https://invent.kde.org/plasma/powerdevil/-/blob/master/daemon/powerdevilprofilegenerator.cpp

Looks like we don't auto-suspend on AC power at all right now. I agree that we should. 15-20 minutes sounds about right.

While looking into that, I found and fixed a bug: https://invent.kde.org/plasma/powerdevil/-/merge_requests/143

And here's an MR to suspend by default: https://invent.kde.org/plasma/powerdevil/-/merge_requests/144

I do agree that we should match the other Fedora desktops in power usage so we are all consistent.
It looks like the other desktops are doing this just on F38 +.
We often push our KDE changes down to all the stable versions.
If possible, I recommend not pushing this change down to all the stable versions (F36, F37). It will cause confusion and possibly sadness for people expecting it to be how it currently is.

If this gets into 5.27.X it might be a bit complicated not to bring it to older versions :/

This is done on the KDE side. The change is targeted for Plasma 6 but the commit itself (https://invent.kde.org/plasma/powerdevil/-/commit/f49291de73586c5fc96f6c579595066e075036a8) is small and self-contained, so you can backport it to whatever releases you need for your purposes--or not.

I do agree that we should match the other Fedora desktops in power usage so we are all consistent.
It looks like the other desktops are doing this just on F38 +.
We often push our KDE changes down to all the stable versions.
If possible, I recommend not pushing this change down to all the stable versions (F36, F37). It will cause confusion and possibly sadness for people expecting it to be how it currently is.

Fedora Workstation preloads are getting adjusted anyway, so it will affect them. The only reason it's not going into older versions via updates is because of a lack of desire to backport the fix to older GNOME releases upstream. For us, I think we should just backport it to 5.27 everywhere.

It's actually 100% safe to backport because existing users won't get the change. Default power profiles are generated once on first login, and this change only affects the generation code. Existing users will only get the change if they click on the "Defaults" button.

OK. Sounds good.

This has been taken care of upstream.