Weird Characters and Very Slow Keyboard When waking iMac From Sleep

Back last year I think, someone posted the following question, which just about perfectly describes what has started happening with my late 2012 iMac, running Sierra 10.12.4

"When waking my Mac Mini late 2014 from sleep, I occasionally get odd input characters and slow response from the keyboard. Sometimes, I hit just one key and it goes crazy auto filling for about the next 10 to 15 characters. I have searched the web and I see many others having this issue as well (all seem to be with El Capitan). A hard power down is all that fixes it. Help!"

The answer to that post was to try these -- neither of which helped:

Resetting the System Management Controller (SMC) on your Mac

How to Reset NVRAM on your Mac

Someone in a related post suggested removing and reinstalling the wireless keyboard. That did not help. It still seems that the only solution is to do a power down and restart.

Does anyone have any other ideas?

Thank you in advance!

Pete

iBook, Mac OS X (10.4.11)

Posted on May 18, 2017 8:18 PM

18 replies

leepj Author

Level 1

8 points

Jun 8, 2017 6:08 PM in response to Warrren Anderson

Hi Warren,

I did not have this until recently. I 'upgraded' to 10.12.5 a while ago (don't recall how long) and this keyboard issue showed up a good while later. I thought at first it was transient, but now it seems to happen (as you noted) EVERY TIME the iMac goes to sleep.

I'm hoping that 'Brenden' has some ideas. It's annoying, for sure. Makes me wonder what other little bugs are lurking, waiting for the right conditions to wake them up ...

Jun 8, 2017 6:39 PM in response to leepj

Well, as for other little bugs, you might want to read my thread about Mail. My Mail began to act up and then it crashed in March. After that it has been terminally broken with very little functionality ever since, in spite of literally spending days on the phone with senior Apple support people, trying to recover my mailboxes with Time Machine, filing bug reports etc. etc. and it's unfixable.

Then there's my thread about Time Machine...

Jun 9, 2017 8:33 AM in response to Warrren Anderson

I found another advantage to disabling sleep in my Mac: My machine is connected to a DSL modem via ethernet. This is supposed to be an always-on connection. In recent versions of OS X, when your computer goes into sleep mode, it disconnects from the network. Then you have to wait a while for it to reconnect before you can check your e-mail, open a browser, etc. If you disable sleep you can return to your machine and do this immediately.

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Weird Characters and Very Slow Keyboard When waking iMac From Sleep