Laptop external monitor starts dimming
I recently had the backlight on my laptop go out, so I've been forced to use an external CRT monitor. After about an hour or two the external monitor starts to dim until you eventually can't see anything. If you turn the external monitor off and let it sit a while everything goes back to normal until the process repeats itself.
The video card is an intel i915 mobile and I'm not using xinerama. I'm also not using X, just the console.
Is the external monitor going out or is it a problem with the laptop?