Bootcamp: After rebooting from Windows 10, USB devices not working upon wakeup

Question

Mike Ostman Author

Level 1

34 points

Bootcamp: After rebooting from Windows 10, USB devices not working upon wakeup

Anyone have a problem similar to this one? Here are the simple steps.

OSX El Capitan. Bootcamp: Windows 10. iMac, 5k Retina.

Boot into Windows.

Reboot back to OS X using the Windows Bootcamp systray icon

After returning to OS X, allow your Mac to go into hard sleep

When you go to wake up the Mac, it won't wake via mouse movement or keyboard presses (both USB). However, hitting the power button will wake the Mac, only the USB devices are not working. The mouse (judging by the IR light) is not even powered.

a PRAM reset will always fix this problem. Once. Any time you return back from Windows 10, the problem is back.

Its really odd. I've seen issues close to this one, usually centered around having some odd USB device like a camera plugged in during the reboot. So I've made sure to have only the keyboard and mouse plugged in. Still the problem persists. I'm in the process of testing different combinations of keyboards and mice to see if, perhaps, one of the devices I am using is to blame.

iMac (Retina 5K, 27-inch, Late 2014), OS X El Capitan (10.11.1)

Posted on Nov 14, 2015 3:57 PM

Reply

Answer 1

Jan 25, 2016 11:14 PM in response to Mike Ostman

I have a similar issue. I have 5K Mac with Windows 10 installed but I'm booting into Windows 10. I use it all day, I have changed the settings to prevent the computer from going to sleep, but to allow the screen to turn off after an hour. However the next morning when I go back to computer it doesn't respond to any mouse or keyboard inputs. If I press the power button the screen comes on but still no response form keyboard or mouse. Only a restart seems to rectify it.

Reply

Answer 2

Loner T

Level 9

59,513 points

Jan 25, 2016 11:45 PM in response to British Bulldog

On an iMac, your screen is not a monitor, but a full USB/TB hub. You are essentially powering down the USB hub. You will need to adjust how and which devices wake up the iMac. As a test, enable Remote Desktop, enable wake-on-lan, and try to connect from a remote PC.

Please check Event Viewer on various events before the display goes to sleep.

Reply