Comment 136 for bug 1283589

I agree 100% that people should avoid Samsung hardware if they're planning on using it with Linux. The response upon support requests for Linux issues has always been "use Windows" and we shouldn't encourage that kind of toxic behavior from a manufacturer.

I have an NP550P5C which is also plagued with ACPI issues, including this one, and doing a little bit of research I found a workaround that works for me:

1) Remove the battery and leave it out for a minute or two (some people mentioned that I could use a reset button that's below the battery but my model doesn't have one)
2) Remove the AC plug before suspending or resuming.

If I do 1) once and keep doing 2), the AC detection seems to work. For some reason, suspending and resuming with the AC plugged seems to cause the issue, and the only way to revert it is doing 1). Booting on Windows does nothing if the issue has already occurred.

I hope this helps.