To clarify, it's something that only happens when he's using a headset & the N9's lying flat on his desk.
Apparently when he continues to hold it in his hand, it's not an issue...
https://harmattan-bugs.nokia.com/show_bug.cgi?id=79#c66
So do you think this is something that may be fixed eventually, I wonder if it's reported anywhere?
Being in an active phone call, is not something I'd consider "idle"....