I have a bunch of live tiles that are handy to glance at to tell me what meetings to go to - this is great, but when my phone is on my desk on charge, but it doesn't seem possible to set a different time out when on mains (or plugged into a PC) versus when it's running on battery?
Yes, and you can do this in Settings > lock + wallpaper > Screen times out after
. But not all phones supports this action. I know Nokia Lumia 800 have max time out limit of 5 minutes. Also remember this action is not specific when charging.
See how in this video.
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1This only lets you set a single global setting, not have different settings for on power/on battery – Rowland Shaw♦ Apr 26 '12 at 19:51