Pen Input Not Working Fix
Reinstall the ASUS Pen Driver
Visit ASUS Support for Zenbook Pro 14 OLED UX6404. Download the latest ASUS Pen or Stylus driver. Open Device Manager, expand Human Interface Devices, uninstall the pen device, then install the new driver. Restart.
Update Intel Serial IO Driver
The Intel Core Ultra 9 185H uses Intel Serial IO to communicate with the touch digitiser. Download the Intel Serial IO driver from ASUS Support and install it. This controls the I2C bus that the pen digitiser uses.
Check the pen tip and battery
Replace the pen tip if it is worn flat — a worn tip reduces pressure detection accuracy. The ASUS Pen 2.0 uses a rechargeable battery; charge it via the USB-C port on the pen body for at least 30 minutes before testing.
Calibrate the touch digitiser
Search “Calibrate the screen for pen or touch input” in Windows Search. Run the pen calibration, tapping each target point with the pen tip. Save the calibration profile to fix offset issues.
“Reinstalling the Intel Serial IO driver fixed the pressure sensitivity on my Zenbook Pro 14 OLED. Had no idea that driver was related to the pen.” — Tiara, Cyberjaya
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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