Horrible screen flicker/strobe on battery power

[Meatball]

On first discharge still since full recharge. Started getting occasional "blinks" every minute or so while browsing, and as I hit 90% battery, the flickering began at ~50% brightness. Dropped brightness down to 3rd level where it's back to an occasional blink, but not a continuous seizure-inducing nightmare. I'm noticing that there's a distinctly audible coil whine as the flickering starts, and then all of a sudden stops when the flickering stops (until it starts again).

In my case setting the CPU to 400mhz really helps which also suggests a power issue!