Windows 10: Only the Power Button Wakes PC from Sleep

My system: Win 10 64 bit Retail, MSI B150M Mortar, Intel i5-6500, Samsung 512GB SSD, Corsair 2 x 4 GB Memory, etc.

Although my keyboard and mouse are allowed to wake the PC from sleep (in Device Manager), they don't wake the PC. Interestingly, pressing the "Power Button" on my Fractal R5 case does wake it up from sleep. Any idea about what's going on?

:)

 

Keyboard and mouse cannot wake the computer after sleep

I did run troubleshooting for power in System and Security, and it detected that the time before display goes to sleep is too long (and that it was fixed). But the keyboard still cannot wake the pc after sleep.

However, during the time that the on/off button of the display is white when going into sleep (then having a black screen), the keyboard is able to wake the pc. Only when the on/off button of the display is orange, the keyboard cannot wake the pc anymore.

 

power/sleep button only works once after each reboot

My power scheme sets the (physical) power-button action to Sleep (S3). And if I press it, the PC does properly sleep (and properly wakes when prompted to). But after the PC wakes, if I press the power button again, the button-press is just ignored (even
though the power-scheme button-action is still set to Sleep).

If I reboot, the power button once again will put the PC to sleep, but again only the first time. Then it stops working again until after the next reboot.

The problem with sleep is ONLY when the power button is used. I can (repeatedly) put the PC to sleep via the sleep button on the keyboard, or via the power menu, or just by leaving it idle. So sleep/wake itself works fine.

And the physical button itself has no defect. The button ALWAYS works to wake the PC when it's asleep (or to shut the PC down if the button is held for several seconds). And the button ALWAYS puts the PC to sleep the first time the button is used after a reboot
(but NEVER on subsequent attempts).

I've tried restoring the default power settings for all plans, then reestablishing my own settings, but the problem persists.

The problem did not exist under Windows 7. It started after the upgrade to Windows 10. The device manager does not flag a problem with any device (including ACPI Fixed Feature Button, which lists the event of "migrating" during the W10 upgrade; it claims to
have the latest available driver). Sfc, dism, and chkdsk show no errors.

I've seen online reports of this same bug (sleep button works exactly once after each reboot, sleep/wake otherwise normal) on some PCs after they were upgraded from Windows 7 to 8. But I have not found any solutions online.

Motherboard is ASRock Z77 Extreme4, with latest BIOS and drivers (which do not include specific support for Windows 10, though Microsoft's compatibility checker noted no hardware or software incompatibilities prior to the W10 upgrade).

This problem is unimportant since as mentioned, I can put the PC to sleep several other equally convenient ways. But I'm curious whether anyone knows of a solution.

 

You also need to access the BIOS and setup to allow Wakeup from Keyboard/Mouse
NOTE: If you have a USB keyboard then you also need to setup for USB to wake up.

 

That solved the issue. Thanks, man!