Sorry...BUT THIS DEVICE HAS NEVER BEEN OVERCLOCKED.
IIRC this is a Kernel issue that makes powertop show 1150 no matter what the clock freq is when using Kernel-Power.

[slightyofftopicrant]
I have KP and KPS but use KPS to underclock to 125-600.
I do this as I have tested 250-600 and 125-600 and find with my usage (music playing >6 hours a day) allowing 125 gives me better battery life.
This is why I also pasted the kernel-config show output!
[/slightyofftopicrant]

I don't believe in overclocking the N900 I wish to look after as much as possible. Even to the point of putting all personal files and swap on uSD to reduce eMMC wear. This is a concorde device that sadly may never happen again.

@Estel
I to hope it's not a hardware fault.
Any more info on this issue with wifi switcher would be useful.
Thanks, for the tip on AIS will try that out.
Will do some power searching...

I have reinstalled KP50 and KPS and will monitor for now.
I could really do without a reflash if I can help it, it will take me a while to rebuild everything.

All seems normal again ... for now.