USB Video Driver - Why does the screen display abnormally or even blank screen?
Please check the following to see if something caused this issue:
- 1. Check if your system display adapter driver is installed properly.
- 2. If you have DisplayLink devices installed in your system, please remove the driver from Control Panel\ Programs and Features\ since these kind of devices may influence the performance.
- 3.If you have the USB to VGA adapter connected to a USB 3.0 Hub, connect it directly to a USB 3.0 port on your computer instead.
- 4.Out of date USB3.0 xHCI hosts may have some compatibility issues due to the specification. It could cause either blank/blinking screen, or only low resolutions supported. Please connect the device to the latest USB 3.0 xHCI hosts.
- 5.If No is shown in the Loaded column for either kext, follow the steps below to enable the kexts
Starting in macOS High Sierra 10.13, security policies require that kernel extensions (kexts) must be enabled by the user. The Fresco USB-to-Video driver includes two kexts that need to authorized.
Check if the Fresco kexts are blocked
- 1. in the Apple menu, select About
- 2. Open the System Report
- 3.In the left pane, under Software, select Extensions
- 4.Locate the extensions named, IOProxyFramebuffer and IOProxyVideoCard
- 5.If No is shown in the Loaded column for either kext, follow the steps below to enable the kexts
!!!It is only possible to enable new kexts for 30 minutes after installation. To restart the 30 minute timer, run the installer again.
- 1. Open System Preferences from the Apple menu.
- 2. Select Security & Privacy.
- 3.Check for a message at the bottom of the window "System software from developer "Fresco Logic, Inc." was blocked from loading" If you do not see this message, close System Preferences and reinstall the software.
- 4.Click on the Lock to make changes
- 5.Follow the prompt to enter your password and allow changes.
- 6.Click Allow.
- 7.Click on the Lock again to save the changes.