This is my first post... please be gentle!
I have some minor experience with Arch on the desktop, but this is my first Pi. It's been a while since I've tinkered with Linux.
So, I'm running XFCE4. Everything is meeting my expectations, apart from one thing: my monitor resolution is stuck at 1824x984, and I can't figure out how to change it to 1920x1080. (I have no xorg.conf.) Also, oddly, XFCE reports that my refresh rate is 0.0 Hz.