I have been playing around with the Onboard settings and even though I select the option "Show when unlocking the screen" from the settings the keyboard still doesn't appear when on screen lock. This appears to be an issue with Onboard and Ubuntu. Which is frustrating for me because I really like Ubuntu on my tablet but that is an important feature that doesn't seem to be working right and is holding it back.
I see there is another question pertaining to this exact same issue which hasn't received a response. So I am asking again, has anyone gotten this working? Any word from the developers (I can't seem to find any) on making this functionality available?