I'm on a 5K iMac and Apple Wireless Keyboard running the El Capitan GM seed, and sometimes when I awake it from sleep, my keyboard becomes unusable -- it still recognizes keystrokes, but the keystrokes registered do not correspond what what I input. For example, I require my password when resuming from sleep, and if I hit even one key, there will be a small delay and then the password field will start filling with a long string of characters. It's not an infinite string, so it will eventually stop, and I can't see what keys are being filled since it's a password (hidden). The mouse seems to work fine, but the keyboard becomes useless. It doesn't always happen when the computer goes to sleep, and a hard reboot will always fix this problem. Also, a wired Apple keyboard works perfectly, even when the wireless keyboard exhibits this problem. I've tried two Apple Wireless Keyboard with the same results, so I don't think it's the keyboard. I've also done a clean install of El Capitan, and this still happens, so it's not a weird software glitch specific to my install.
I've noticed this issue since earlier El Capitan developer preview versions (can't remember exactly when it started), but I always figured it would get ironed out by the GM. Now that it still exists in the GM, I'm beginning to think maybe something else may be going on. Has anyone else experienced anything like this? Thanks in advance!
