DisplayLink Forum - View Single Post - FQQ Quad Screen Not Working After macOS 26.5 Update

uabramov · Yesterday, 01:37 AM

I am seeking urgent technical assistance with my FQQ quad multi-screen setup.

Following the installation of macOS 26.5 (25F71) this morning, my FQQ display unit stopped working immediately. I am using a November 2023 16-inch MacBook Pro with the Apple M3 Max chip.

The monitors are no longer being detected at all. I have already attempted the following troubleshooting steps:

• Reinstalled DisplayLink / FQQ drivers
• Restarted the Mac multiple times
• Disconnected and reconnected all cables
• Tested different USB-C ports
• Re-granted Screen Recording permissions in macOS
• Uninstalled and reinstalled DisplayLink Manager

Unfortunately, nothing has resolved the issue.

Before updating to macOS 26.5, the setup was functioning properly without any problems.

Has anyone else experienced this issue after updating to macOS 26.5?
Is the FQQ quad monitor officially compatible with macOS 26.5 and Apple Silicon M3 Max devices?

I have an important presentation scheduled shortly and would greatly appreciate any immediate solutions, workarounds, or confirmed fixes.

Thank you in advance.

Yesterday, 01:37 AM	#1
uabramov Junior Member Join Date: May 2026 Location: NJ Posts: 4	FQQ Quad Screen Not Working After macOS 26.5 Update I am seeking urgent technical assistance with my FQQ quad multi-screen setup. Following the installation of macOS 26.5 (25F71) this morning, my FQQ display unit stopped working immediately. I am using a November 2023 16-inch MacBook Pro with the Apple M3 Max chip. The monitors are no longer being detected at all. I have already attempted the following troubleshooting steps: • Reinstalled DisplayLink / FQQ drivers • Restarted the Mac multiple times • Disconnected and reconnected all cables • Tested different USB-C ports • Re-granted Screen Recording permissions in macOS • Uninstalled and reinstalled DisplayLink Manager Unfortunately, nothing has resolved the issue. Before updating to macOS 26.5, the setup was functioning properly without any problems. Has anyone else experienced this issue after updating to macOS 26.5? Is the FQQ quad monitor officially compatible with macOS 26.5 and Apple Silicon M3 Max devices? I have an important presentation scheduled shortly and would greatly appreciate any immediate solutions, workarounds, or confirmed fixes. Thank you in advance.