I have my Raspberry Pi 2 since a week and noticed that little rainbow on the top right corner of the screen.
Seems like this is a alert for under voltage. I tried different power supplies and my best one is a "Anker" 30W. It's just impossible that the Raspberry Pi needs more power than 30W. I also tried different cables... so it must be a Raspberry problem.
All I have plugged in the USB ports is a keyboard.
The Raspberry is running chromium which needs a lot of energy...
So my question is: Is it possible that the Raspberry Pi needs more energy but has something like a max voltage regulator which doesn't allow more? Or is this just a bug? Or maybe that rainbow has also another meaning?
I know that I can turn off these warnings but fear that the SD card corrupts.