I looked at the bug report and I tried playing around with upower --dump and upower --monitor-detail and got the following:
On the laptop, upower sees the power supply attached to the laptop (the power supply info disappears if I disconnect it). On the desktop, upower doesn't see the power supply. Maybe it has something to do with the ACAD function ignoring the power supply on the desktop because it is not detachable or the supply sends a code that causes ACAD to ignore it? Sort of looks like that might be the determining factor. I'll see if I can find out anything about the ACAD function.
Merci et prendre soin,