So after a pretty catastrophic failure of a Yosemite upgrade (that resulted in salting the earth and starting from scratch), I've noticed a strange new behavior.
Occasionally, when waking the computer from sleep and attempting to log in, the external USB keyboard (a Das Keyboard 4) won't work. There's no input in the password area, etc. The external USB mouse works just fine, and upon unplugging the keyboard and plugging it back in, the keyboard works again. There's no obvious failings of the keyboard, and I've tried several USB ports in case that was the problem, as well as resetting the SMC.
Any ideas what's going on?
Occasionally, when waking the computer from sleep and attempting to log in, the external USB keyboard (a Das Keyboard 4) won't work. There's no input in the password area, etc. The external USB mouse works just fine, and upon unplugging the keyboard and plugging it back in, the keyboard works again. There's no obvious failings of the keyboard, and I've tried several USB ports in case that was the problem, as well as resetting the SMC.
Any ideas what's going on?