I'm having a very irritating bug with my N900: While I use it the screen constantly dims and brightens, and dims again, and...

The rate at which it does this varies, and it has nothing to do with me touching the screen, using the keys, or whatever.

I had the Simple Brightness Applet installed, so I thought maybe that was what caused the problem, but now I've uninstalled it, and I still have the problem. I can't remember if this occurred before I installed it or not, but I think it did.

This is extremely annoying. Does anyone know if this is a software bug or a hardware issue? I couldn't find any talk about this her on the forums.