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Problem description: I am experiencing this strange issue when unlocking my Windows 10 PC: I press a key on my USB keyboard and the lock screen switches to where I can enter my password to unlock my computer. Then my keyboard will stop working a few seconds later, only allowing me to enter from zero to 3-4 characters of my password before the keyboard goes unresponsive. Sometimes, if I unplug a USB device (it can be any currently plugged in USB device, not just my keyboard) then any characters I may have typed while the keyboard is unresponsive will suddenly appear. Other times this wont work and I have to wait until my login attempt times out, taking me back to the lock screen where I can hit enter and try to enter my password once again. The weird thing is that once I am logged in I experience zero USB issues of any kind. It feels like a USB subsystem is going unresponsive during the screen unlock process, but is buffering keypresses until it recovers. Attempted fixes: What have you tried to do to resolve the problem? I have five USB devices plugged in: wired keyboard wired mouse logitech webcam yeti blue usb microphone Yubikey security dongle I've tried various combinations of using the back USB ports and the front usb ports and an external USB hub with the five devices plugged in to one, two or three of these options. I've tried updating drivers and bios. The event viewer is showing no USB errors. Recent changes: Have you made any changes to your system/configuration recently that might have caused the problem? No. Operating system: Windows 10 Enterprise 1909 build 18363.1854 64-bit System specs: Dell Optiplex 990 Intel i7-2600 @ 3.4GHz, 32 GB RAM, SSD, etc. Location: What country are you in? United States I have Googled and read the FAQ: Yes
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Oct 29, 2021 17:41
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| # ? Apr 29, 2024 06:31 |
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Make sure W10 is fully updated. You could also try connecting your keyboard through a USB to PS/2 adapter.
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Oct 29, 2021 23:12
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Windows 10 is fully patched yes. And my PC doesn't have PS/2 plugs so that's out. Even so, it's strange how the phenomenon only surfaces during the login screen, not any time else.
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Nov 1, 2021 16:06
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You could try a different keyboard. It wouldn't shock me if the YubiKey was having some bad effect either.
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Nov 1, 2021 21:47
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Swapped the keyboard with a known good (wired) keyboard and issue remains. The yubikey could make sense, since it's part of authentication stuff. I'll try leaving it out and see what happens.
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Nov 2, 2021 01:32
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| # ? Apr 29, 2024 06:31 |
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It turned out to be a power setting. In Win10 - under Power Options - Advanced Settings there is an option called "USB selective suspend setting" under USB settings. Disabling that made the issue immediately disappear. quote:The USB selective suspend feature allows the hub driver to suspend an individual port without affecting the operation of the other ports on the hub. Selective suspension of USB devices is especially useful in portable computers, since it helps conserve battery power. Many devices, such as fingerprint readers and other kinds of biometric scanners, only require power intermittently. Suspending such devices, when the device is not in use, reduces overall power consumption. https://docs.microsoft.com/en-us/windows-hardware/drivers/usbcon/usb-selective-suspend
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Nov 4, 2021 00:52
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