I had a strange issue with my Dell laptop for a while: sometimes it just started to mess with the display brightness when I move my cursor. This was an odd and curious thing, but it didn’t happen often enough to justify an investigation. A few weeks ago, I accidentally found the cause of this issue. It turns out, Dell has a feature called dynamic backlight control, and it doesn’t always work as intended. Fortunately, it can be turned off in BIOS.