@xxxxts - what is seen in logs is that for some reason bluetooth stack loads HID plugin, but does not register new input device. Have no idea why but is unrelated to extkbd. Two things i can think of remaining:

install syslogd:

as root in xterm type "apt-get install syslogd" without quotes. this will gather additional logs in /var/log/syslog and maybe there will be some clue what is going on with your n900.

OR

reflash , hoping that it will solve your problem.

BTW - how is my dmesg log looks like

677.103393] hci_h4p hci_h4p: firmware: requesting bcmfw.bin
[ 701.121978] Bluetooth: HIDP (Human Interface Emulation) ver 1.2
[ 701.134002] input: Apple Wireless Keyboard as /class/input/input4
[ 701.224548] generic-bluetooth 0005:05AC:023A.0001: input: BLUETOOTH HID v0.44 Keyboard [Apple Wireless Keyboard] on G8:76:F9:A3E:40

yours is missing last two lines