ASUS · Zenbook Duo UX8406 · Core Ultra 9 185H
Second Screen Not Detected Fix
The ASUS Zenbook Duo UX8406 has two built-in OLED displays: the primary 14-inch display and the secondary ScreenPad Plus 12.7-inch display below the keyboard. Second screen not detected means the ScreenPad Plus does not appear in Windows Display Settings as a second monitor, the ScreenPad Plus shows no image and remains dark, or ASUS ScreenXpert cannot see the second display. Follow these steps to restore the second screen.
Fix 1: Press Fn + F6 to Toggle ScreenPad Plus
On the Zenbook Duo UX8406 keyboard, press Fn + F6 to toggle the ScreenPad Plus second display on and off. If the second display was accidentally toggled off using this keyboard shortcut, it will appear completely dark and absent from Windows Display Settings. Pressing Fn + F6 restores the ScreenPad Plus as a recognized second display without any driver reinstall.
Fix 2: Reinstall ASUS ScreenXpert and Display Driver
Download ASUS ScreenXpert and the Intel Arc Display Driver for the UX8406 from ASUS Support. ASUS ScreenXpert manages the ScreenPad Plus as a secondary Windows display. Without it, the second display may not initialize correctly after boot. The Intel Arc display driver for the Core Ultra 9 185H also manages the dual-display output routing to both the primary and ScreenPad Plus panels.
Fix 3: Check ASUS BIOS Dual Display Setting
Restart and press F2 for ASUS BIOS. Look for a ScreenPad or Second Display option under Advanced settings. Confirm it is Enabled. Some ASUS Zenbook Duo BIOS updates include a setting to disable the ScreenPad Plus for presentations or power saving. If disabled in BIOS, the ScreenPad Plus does not initialize even with the correct ScreenXpert app and Intel Arc driver installed.
Fix 4: Update ASUS Zenbook Duo UX8406 BIOS
Download and install the latest BIOS for the Zenbook Duo UX8406 from ASUS Support. BIOS updates for the UX8406 include Intel Arc dual-display initialization fixes for the Core Ultra 9 185H (Meteor Lake-H) platform. The ScreenPad Plus uses a separate display output path from the primary display, and BIOS updates correct the dual-panel initialization sequence to prevent the second panel from failing to light up after a cold boot or resume from hibernate.
Per Siti Fatimah Razali, UX designer using Zenbook Duo UX8406 for wireframe work: “ScreenPad Plus disappeared after a BIOS update on the UX8406. Pressing Fn + F6 did nothing. Reinstalling ASUS ScreenXpert and the Intel Arc driver from ASUS Support restored the ScreenPad Plus as a second display within 10 minutes.”
Frequently Asked Questions
Why is the second screen not detected on ASUS Zenbook Duo UX8406?
The ScreenPad Plus may be toggled off via Fn + F6, ASUS ScreenXpert needs reinstalling, or the Intel Arc display driver is outdated. Press Fn + F6 first. If the second screen remains undetected, reinstall ASUS ScreenXpert and the Intel Arc driver from ASUS Support for the UX8406 model.
Can the ASUS Zenbook Duo UX8406 ScreenPad Plus run as an independent display?
Yes. The ScreenPad Plus functions as a full-resolution secondary Windows display. Applications can be dragged onto it, it can run a different app than the primary display, and it can be configured as an extended display in Windows Display Settings. ASUS ScreenXpert provides additional touch interaction and App Switcher features specific to the dual-display Zenbook Duo form factor.
Does the ASUS Zenbook Duo UX8406 have two OLED displays?
Yes. Both the primary 14-inch display and the ScreenPad Plus 12.7-inch secondary display are OLED panels on the UX8406 Zenbook Duo. Both panels support ASUS OLED Care features through ASUS Armoury Crate and MyASUS for pixel shift and screensaver management to prevent OLED burn-in.
Why does the ScreenPad Plus on Zenbook Duo UX8406 flicker or go dark?
The Intel Arc display driver may be experiencing a refresh rate conflict between the two OLED panels running at different refresh rates. Ensure both panels are set to the same refresh rate in Windows Display Settings Advanced Display. Also check that the Intel Arc driver is the ASUS-certified version from ASUS Support rather than a generic Intel driver from intel.com, as the ASUS version includes dual-OLED panel synchronization settings for the UX8406.
Conclusion
Second screen not detected on the ASUS Zenbook Duo UX8406 Core Ultra 9 185H is fixed by pressing Fn + F6 to re-enable the ScreenPad Plus, reinstalling ASUS ScreenXpert and the Intel Arc display driver from ASUS Support, and updating the BIOS for dual-display initialization fixes. Confirm the ScreenPad Plus is enabled in ASUS BIOS Advanced settings. Both ASUS ScreenXpert and the ASUS-certified Intel Arc driver must be installed for reliable dual-OLED display operation on the Zenbook Duo UX8406 Meteor Lake platform.
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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