I have a thinkpad X1 carbon, and upgraded to Windows 10.
Everything worked fine including sleep.
Suddenly one day ( well I can't really recall which day, just recently), I noticed that when I close the lid, it won't enter into sleep.
If I open the lid, and close the lid again in short time, it will enter into sleep then.
I then started testing, and close and open close and open.
Generally, the behaviour is like this:
1. If I close the lid, 9 out of 10 will not sleep, and there's some chance that it will sleep.
2. If I close the lid (no sleep), open the lid again, and close the lid again in shor time, 9 out of 10 it will sleep at the second close.
3. If I close the lid (no sleep), open the lid, and do some operation (browsing etc), then close the lid, it will not sleep (see step 1)
4. If I change the settings to : close the lid then hibernate, then it works everytime, closing the lid will hibernate the computer.
5. In battery mode, the sleep works when lid is closed, only in plugged-in mode, the sleep doesn't work!
1. I tried to see the system event log, and found that, if I close the lid, and the comuter is not in sleep mode, it enters into Away mode. So it did detect the closing action, and tried to do something, but decided to go to away rather than sleep, which is really rediculous.
2. I tried to seach on the forum, and found some media sharing stuff, I tried all settings, including disable media sharing, they didn't solve my problem.
3. I also tried to use "powercfg -requests" in cmd window and found there are none applications that is preventing the system from entering into sleep.
4. I tried to set every single power settings of plugged-in mode to be as same as "battery" mode, no use. Battery still works and plugged in mode still not working most of the time.
5. System restore is not an option because I disabled system restore (harddisk is too small for system restore).
Any advice will be appreciated.