Okay, so a couple years ago, I bought my wife an Acer Aspire one. And just recently, because she is using it for work, I bought her a full size monitor.
So, here is some background:
When I set up the dual monitors, I can manually set the thing to work okay. Sometimes I set it up to run the 2 monitors, but sometimes we close the notebook monitor and just run the big monitor. So far, so good.
Now here is the issue.
When she switches back to the built-in screen only (1024x600), maximized windows stretch off the screen to the right and bottom, so she cannot access important parts of program windows. KDE system settings show that the screen resolution is correct.