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(Just documenting for others with the same problem:) For some time my laptop (Lenovo Thinkpad T480) did exhibit this strange problem when trying to resume from Sleep/Hibernate:

  • When the laptop was connected to a USB-C dock (on AC) the laptop would not wake when pressing the power button. Rather the power button would just blink rapidly three times (which the Lenovo docs say is just indicative of a AC adapter being connected).
  • When the laptop was disconnected (on battery) then the power button would wake as usual.

Things I tried unsuccessfully to resolve:

  • Look for any BIOS boot/start option referring to power button or boot/wake functions.
  • Check in the device manager that devices such as the keyboard were marked as "Allow this device to wake up the computer"
Christopher Oezbek
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To get the power button to work with the docking station I needed to disable "USB selective suspend settings" (Windows > Edit Power Plan > Changed Advanced Power Settings > USB Settings > Plugged in > Disable).

Disable USB suspend settings

If the entry for selective suspend is missing you can follow this superuser answer to enable it.

Christopher Oezbek
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  • In my W10 (21H2) the USB option does not show up there for some reason. I have there just "desktop background settings", "energy savings", "display and "battery", but no "USB" section. https://i.imgur.com/m4yAkJU.png – Michael Uray Sep 07 '22 at 09:11
  • I am still on 21H1 so I can't say, but it might be an option which is disabled in the HP Power Plan. You might try to unhide the settings following https://answers.microsoft.com/en-us/windows/forum/all/usb-settings-in-power-plan-options-on-windows-10/38753b89-65d0-49c1-8f91-2bb50f9b19a0 – Christopher Oezbek Sep 07 '22 at 09:24
  • Thanks, I have already tried this, but it did not help. On another W10 PC with 21H2 everything shows up as it should. – Michael Uray Sep 07 '22 at 09:36
  • This helped to enable the USB options and after that I was able to fix the power button issue as you described: https://superuser.com/a/1600223/628977 – Michael Uray Sep 07 '22 at 10:01
  • I added your suggestion to the answer. An upvote would be welcome to indicate the answers works for others. – Christopher Oezbek Sep 07 '22 at 10:18