Common causes
Lenovo Slim Pen 2 battery discharged — the pen must be charged before it can be detected by the Wacom AES touchscreen
Wacom pen driver removed or corrupted by a Windows 11 feature update, leaving the AES touchscreen without stylus input support
Using an incompatible MPP stylus instead of the Lenovo Slim Pen 2 — MPP pens are not detected by the Wacom AES digitiser
Windows Ink settings disabled, preventing the operating system from passing pen input to apps even when the stylus hardware is detected
How to fix
Attach the Lenovo Slim Pen 2 to the magnetic charging surface on the left side of the Yoga 9i Gen 9 for 10 to 15 minutes before testing. A low battery is the most common reason the pen is not detected.
Run Lenovo Vantage → System Update. Install any available Wacom Pen Driver update for the Yoga 9i Gen 9. This is the fastest and most reliable fix for a software-caused stylus detection failure.
Settings → Bluetooth and devices → Pen and Windows Ink. Confirm Windows Ink workspace is enabled. Without Windows Ink, pen input does not pass through to most apps even if the hardware is detected.
Device Manager → Human Interface Devices → look for Wacom Pen entry. If missing, right-click an empty area → Scan for hardware changes. If the Wacom device appears with a warning, right-click and update driver.
“The pen just needed charging — after 10 minutes on the magnetic charger, the Slim Pen 2 was immediately detected on my Yoga 9i Gen 9.” — Wardah, Kelana Jaya
Ryan holds a Computer Science degree and has spent over 15 years troubleshooting Windows hardware and driver issues across major laptop brands. He writes practical, step-by-step guides for everyday users at softwaredriverdownload.com.
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