dom wrote:No. It's a different overlay to the framebuffer. I'm sure it is present.
A voltmeter seems the obvious way to confirm this (but it will be showing a low voltage).
I had a feeling that it was an overlay.
I put my inline usb meter in place with no load the power supply sits at 5.01v. Once I start the Pi, it drops to 4.97v @670ma output. So under a load it seems to sit at 4.97v. Is there any information you can share about the brownout detection, what it considers low +/- any tolerances etc?
I guess I need to get an adjustable regulator, if I am going to that length I may as well stop powering over usb.