Comment 8 for bug 1575148

More details: upon resume from sleep, after pluging in an external monitor to be able to trigger whatever makes the screen come up, the tty 1 shows the following:

Ubuntu 16.04 LTS metall tty1
metall login: [ 7875.907520] xhci_hcd 0000:00:14.0: Command comp
letion event does not match command
[ 7876.111524] usb 2-3: device not accepting address 4, error -62
[ 7880.915458] xhci_hcd 0000:00:14.0: Error while assigning device slot ID
[ 7880.915482] xhci_hcd 0000:00:14.0: Max number of devices this xHCI host supports is 32.
[ 7880.915504] usb usb1-port1: couldn't allocate usb_device
[ 7886.707269] xhci_hcd 0000:00:14.0: Command completion event does not match command
[ 7892.126537] usb 2-3: device not accepting address 5, error -62

For comparison, the "lsusb" command prints:

$ lsusb
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 003: ID 05ac:0259 Apple, Inc.
Bus 001 Device 006: ID 05ac:8289 Apple, Inc.
Bus 001 Device 002: ID 0a5c:4500 Broadcom Corp. BCM2046B1 USB 2.0 Hub (part of BCM2046 Bluetooth)
Bus 001 Device 007: ID 413c:3016 Dell Computer Corp. Optical 5-Button Wheel Mouse
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

Of note: when the screen is black, the keyboard LED lighting doesn't come up either.