Lenovo Yoga 9i Gen 9 Stylus Bluetooth Pairing Fix
The Lenovo Yoga 9i Gen 9 (Core Ultra 7 155H) supports the Lenovo Precision Pen 3 and is compatible with MPP 2.0 styluses. Pairing issues are common after Windows updates or when the pen battery is low. The fixes below restore pen Bluetooth connectivity reliably.
Replace the stylus battery first Check first
The Lenovo Precision Pen 3 uses a AAAA battery for Bluetooth functions (side buttons, eraser). A low battery causes Bluetooth pairing to fail even though the tip-pressure drawing still works on the digitizer. Replace the battery and attempt to pair again before proceeding to software fixes.
Remove and re-pair the pen in Bluetooth settings
Go to Settings → Bluetooth & devices. Find the Lenovo Pen entry and click the three dots, then choose Remove device. Hold the pen top button for five seconds until the LED blinks rapidly to enter pairing mode. Click Add device in Bluetooth settings and select the pen to pair fresh.
Update the Bluetooth driver from Lenovo Support
Go to Lenovo Support, find Yoga 9i Gen 9, and download the latest Intel Bluetooth or Qualcomm Bluetooth driver. Install it and restart. Windows updates frequently replace Lenovo-optimized Bluetooth drivers, which can cause pen pairing to fail on subsequent boot cycles.
Install the Lenovo Pen Settings app
Download the Lenovo Pen Settings app from the Microsoft Store. This app manages pairing, button mapping, and pressure curves for the Precision Pen 3. Installing it can resolve issues where the pen connects over Bluetooth but side buttons do not respond.
Update the BIOS
Install the latest BIOS from Lenovo Support via Lenovo System Update. Some Yoga 9i Gen 9 units have BIOS updates that fix Bluetooth coexistence between the pen and other paired devices such as wireless headsets or mice.
Common questions
Drawing works but side buttons do not — why?
Bluetooth is not paired. Replace battery and re-pair. Drawing uses the digitizer, not Bluetooth.
What battery does the Precision Pen 3 use?
One AAAA (LR61) battery. Available at most electronics and grocery stores.
Does the Yoga 9i support any stylus?
MPP 2.0 styluses work. Lenovo Precision Pen 3 is the recommended model for full feature support.
Can too many Bluetooth devices cause pairing to fail?
Yes. Remove unused Bluetooth devices and try pairing the pen again in a less congested state.
Nurul, Putrajaya: “My Lenovo Pen 3 side buttons stopped working on the Yoga 9i. Replacing the AAAA battery fixed Bluetooth pairing immediately. The drawing tip still worked because it uses the digitizer, not Bluetooth.”
Frequently Asked Questions
Why does stylus drawing work but side buttons do not on the Lenovo Yoga 9i?
The drawing tip uses the built-in digitizer in the screen and does not require Bluetooth. Side buttons and the eraser function over Bluetooth, which needs a paired connection and a working battery. Replace the AAAA battery and re-pair in Bluetooth settings to fix side button functionality.
Can I use Microsoft Surface Pen on the Lenovo Yoga 9i Gen 9?
Yes. The Yoga 9i Gen 9 supports the MPP 2.0 protocol used by the Surface Pen and other compatible styluses. However, side button mapping and full pressure curve customization may require the Lenovo Pen Settings app, which only officially supports Lenovo-branded pens.
Does the Lenovo Yoga 9i Gen 9 charge the stylus wirelessly?
No. The Precision Pen 3 is battery-powered and does not support wireless charging. The pen uses a single AAAA (LR61) battery which typically lasts many months under normal use before needing replacement.
Will a Windows Update unpair the stylus automatically?
Sometimes. Windows Updates that replace or reset the Bluetooth driver can cause previously paired devices to appear disconnected. Re-pair the pen after any major Windows update if Bluetooth connectivity is lost.
Ryan holds a Computer Science degree and has over 20 years of hands-on experience with PC hardware, software, and driver troubleshooting. He is the author behind softwaredriverdownload.com, where he helps everyday users fix driver issues quickly and accurately. Ryan has personally tested most of the fixes on this site across a range of Windows 10 and Windows 11 machines.
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