I have a HP Pavilion G7 (Win7 64 bit). I use an external monitor (Acer x223w) rather than the laptop display 95% of the time.
The external monitor display is quite dim, and text is hard to read. Not sure when this started, I did not notice at any one time, so I don't think it was instantly, more likely progressive over time.
The laptop monitor is still quite bright.
I have tried adjusting bright/contrast, calibrating color, troubleshooting, and checking drivers. I tried a new monitor and new vga cable - still same problem: dim.
What is likely to be going on?