MacPro Mid 2012; quad core 3.2 GHz Xeon processor 24 GB ram running Yosemite 10.10.5
4 internal 4 TB drives, 2 external 4 TB drives in NewTech cradles. 3 Dell 1920 x1280 pixel LCD monitors.
Microsoft USB corded mouse.
Stopped working yesterday.
Rebooted. Mouse cursor shows up, but doesn’t move with mouse.
Tried different mouse.
Tried different USB port
ALL USB access stops.
Rebooting is not sufficient.
Have to fully unplug, and restart.
(It may be sufficient to reset the PRAM on reboot. didn't try that.)
Further: I can now reproduce the problem: If I connect my iphone 6s to my mac with a 3 meter Lightning to USB cable, the mouse (and USB) stops working.
On shutdown there is a long stream (several screenfulls of probe error messages that flash by.
2017-12-23 10:01:03.000 PM kernel: [0 0 ] target connection status changed 2017-12-23 10:01:03.000 PM kernel: [0 0 ] port handle error (irq status 80000040)
This pair appears about 100 times per second grovelling through the system log.
Connecting with an official apple 1 meter Lightning cable works.