I figured out that BeagleBone Black acts weird when it doesn't have power supply from 5VDC supply jack, and it is only powered from USB connection's 5V. When it is powered like that it drops USB connection constantly, I thought BBB drivers are the problem, but even after I installed them, connection hangs up every 3-5 minutes. What to check next?
USB connection to BeagleBone Black drops
beaglebone blackfailureusb
Best Answer
The BeagleBone Black consumes ~300mA at idle, with minimal if any peripherals connected. Under load, it will require more. If your USB connection only provides 100mA as you have stated, the connection drops are painfully obvious. The BBB is starving. Any time it attempts to pull more current, it will brown-out, stop drawing power, reset, and rinse lather repeat.
You need a stronger power supply, or a powered usb hub if your computer's usb port is not up to snuff. It should be providing 500mA at least. Even that may be borderline (5V @ .5A = 2.5W).