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! KERNEL BUG !A Kernel bug in the linux kernel was causing 2 issues: 1. the green flickering and 2. the usb ports would die until rebootThere is a bug in the linux kernel known as the “USB Shutdown Bug” which impacts machines that have both USB 2.0 and USB 3.0 ports such as mine. Connecting the device to a SuperSpeed USB port or a USB 2.0 port can trigger the bug. * https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1200204* https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1313279