External monitor no longer wakes from sleep (10.11.2 update)
I have an external LG LED-LCD panel connected to my Mac Pro 2013 via HDMI.
No problems with display sleep at all before... but since updating to 10.11.2, it just does not wake from sleep and I have to force a reboot. I have since turned display sleep options off and I now use a password-protected screensaver instead (for security), and just switch my monitor off with the power button.
I had this problem also with Beta 2 and Beta 5 of 10.11.2. Both times I reverted back to 10.11.1 from Time Machine, hoping it would be fixed in the final release.
Before anyone says it, the following link is not welcome... I didn't come down in the last shower: If your Mac doesn't sleep or wake when expected - Apple Support
It's definitely something that has changed in El Capitan 10.11.2. I now have a $10,000+ beast of a computer that can't put its own display to sleep 😝
Mac Pro, OS X El Capitan (10.11.2), Late 2013 model