I'm having an annoying problem with my Mint 14 + Cinnamon environment which I can't get to the bottom of.
Randomly, when I alt-tab between windows, the screen dims by about 50% and I can no longer click on icons in the panels.
Alt-tabbing again will only brighten the screen whilst alt-tab switching is active, and then the screen dims again. Also, right clicking to bring up a context menu shows the menu in full brightness.
I can restore my desktop to working by logging out and back in again. I've tried fiddling with brightness settings but that only changes the brightness down from the current point.
I have no idea what I'm activating accidently by alt-tabbing or how to swtich it off/revert it back - any ideas?
All suggestions gratefully received!
Edit: I should probably add, I'm using Mint 14 + Cinnamon on a laptop, no external monitor - the laptop is a Lenovo T510, Intel i7 M620 @ 2.67GHz, 8GB RAM.
I've also just noticed that the dimming can happen multiple times, so the screen progressively (and randomly) gets darker and darker.