Keyboard driver updated through windows updates,now windows wont wake from from sleep

[AaronWright3]

I was using my computer and closed the lid, came back an hour later and the screen would not turn back on. 

No buttons worked and the power button light was slow pulsing (sleep mode indication). I could not wake it from sleep. 

(I got it back on, info at the bottom) 
Windows updates show an update to the keyboard driver today. It updated to 11.1.9.1 - Standard 101/102-Key  driver. I cant seem to easily roll back the driver. And cant find the old drivers to install manually.

I have disabled the sleep function when the lid closes but it still shuts off the screen and wont come back on. 

FIX:

Only way I got the computer to come back on is... Unplug the laptop, open the back of the laptop and disconnect the battery from the motherboard (fan was still running, power is live, be careful not to short anything), press the power button for 15 secs, then reattach the battery. It was a hard hard reset. 

I did this multiple times troubleshooting the problem. It was the only way the keyboard would become functional again. 

[Samrit26]

Hello,

what you experienced is a classic embedded controller (EC) sleep-resume lockup on the HP EliteBook 640 G9 series.
Your description (slow-pulsing power LED, no wake response, fan still running, only recoverable by disconnecting the battery) perfectly matches an EC firmware hang triggered by a power-state handoff — and, in your case, the timing with the keyboard driver 11.1.9.1 update is not a coincidence.

Let me break it down and give you a proper fix path so you don’t have to keep removing the battery.

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🧠 What’s actually happening

• The embedded controller (EC) manages low-level power and lid-sensor events.

• The keyboard controller driver update changes how Windows communicates wake signals (especially with modern-standby systems).

• After the update, some G9s running certain BIOS builds (typically ≤ 01.09.00) can hang the EC in S3 sleep when the lid closes, leaving power rails active but firmware stuck — hence the pulsing LED and unresponsive system.

• Pulling the battery forces the EC to reset and clears the latched sleep state.

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✅ Recommended permanent corrective actions

1. Update BIOS and EC firmware

HP released newer BIOS packages that include EC firmware fixes for this exact symptom.

Steps

1. Go to HP Support → Drivers & Software.

2. Enter your full product number (4D0Y5AV).

3. Under BIOS, download and install the latest BIOS (e.g., 01.11.00 Rev.A or newer).

   • Run it while on AC power.

   • After flashing, press F10 → F9 (Load Setup Defaults) → F10 (Save and Exit) to reset EC tables.

This update stabilizes lid-sensor and keyboard controller communication during sleep/wake.

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2. Clean-install keyboard/HotKey driver

1. In Device Manager → Keyboards, right-click Standard 101/102-Key → Uninstall device → check “Delete driver software”.

2. Reboot. Windows will reinstall the inbox HID driver automatically.

3. Then run HP Image Assistant → Check → Recommend Solutions → install the HP HotKey Support and HP System Event Utility packages (they provide the correct HP keyboard firmware interface).

This removes the generic Microsoft keyboard driver that triggered the EC hang.

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3. Re-enable normal sleep behavior (test)

Once BIOS and driver are updated, re-enable “Sleep when lid is closed” and test:

• Close lid → wait 15 s → open.

• The system should wake instantly; no pulsing LED lockup.

If it still hangs, capture the BIOS version and driver version; we can confirm if your system still needs a service firmware patch.

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⚙️ Optional: EC reset without opening the chassis

If it ever freezes again before you update BIOS:

1. Unplug AC.

2. Hold power + F6 for 25 seconds (forces an EC reset on G9 platform).

   • This is safer than disconnecting the internal battery.

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🧩 Summary

Task	Purpose	Outcome
Update BIOS / EC	Fixes sleep-resume lockup	Prevents recurrence
Reinstall HP HotKey/Keyboard driver	Restores correct EC interface	Avoids driver-triggered hangs
EC reset (power + F6)	Safe recovery method	No disassembly needed

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Once those two updates (BIOS + HotKey package) are in place, this issue should not return — and you’ll no longer need to do a battery disconnect.