I think the problem is in the xkb setup of the X11.
However I don't know enough to fix it

If you compare /usr/share/X11/xkb/ against N810 you'll find that it contains less. Especially the symbols subdir where N810 has a lot of other layouts but the N900 just the RX44, RX51 and the SU8W.

I think we can fix this issue by setup, thus not needing to wait for Nokia or do code changes.

But would somebody with this knowledge apply to this issue pls ?