Whenever I use pmset sleepnow in Terminal (even with sudo) I get this error:
Unable to sleep system: error 0xe00002e2. I have no idea what's going on. Please help!
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Are you on the latest version of your firmware? This thread mentions that there were problems with old firmware. – JMY1000 Mar 4 '16 at 20:19
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I don't have any updates available in the App Store... Does that mean I have the latest firmware? – atirit Mar 4 '16 at 22:20
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No, firmware updates don't show up on the app store. Follow this guide. – JMY1000 Mar 5 '16 at 22:25
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Followed it; I have the latest FW version for my model. – atirit Mar 6 '16 at 1:33
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Afraid I don't know then, sorry. – JMY1000 Mar 6 '16 at 4:09
I struggled with the problem for months without any luck; the computer was unable to sleep, the sleep option on the apple menu was greyed out, pmset -g assertions (the most popular suggested solution to find ongoing processes) didn't return any result, and resetting the SMC didn't work. Today I finally found the solution that worked for mine
sudo pmset -a disablesleep 0
Hope this works for others too!
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Welcome to Ask Different! The background info is good, but the info about the solution seems to be missing. Can you provide some details, links, or references? – Allan May 21 '16 at 13:09
