End of 2012 iMac keyboard does not respond after sleep

I have an iMac late 2012 and my keyboard does not respond after that lay down the computer.  When I type the password box is very slowly filled with random letters that are not my password and hit enter just adds another letter.  In my view, that it is a common problem that I am many have known for a few months.  Is there a solution to this I have reset PRAM and SMC, and no work.  It's very irritating and I hoped with every update from El Capitan, this would have been fixed, but not joy.

I don't know about "modern" Mac and OS X versions, but on my old Powerbook / Tiger awakened from his sleep, it was necessary to 'click' somewhere (I clicked on always in the password field) before the same keyboard would meet all

Tags: Mac

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