The preview of Windows 8.1 just came out yesterday, and it appears to break compatibility with many existing drivers.
When you upgrade to 8.1, drivers are not migrated from 8.0, rather they appear to be re-enumerated and re-installed.
The most widespread change is new driver signing requirements which may cause many 3rd party drivers to need an update. Also specific to USB graphics is Windows 8.1 introduces a new WDDM 1.3 graphics model, which requires some additional updates.
All that said, DisplayLink appears to be doing a good job of staying ahead of all these changes (they’ve been working with earlier NDA builds, in partnership with Microsoft), and have released their preview driver with support for Windows 8.1 on the same day.
DisplayLink’s 7.4 preview driver with Windows 8.1 support is available here:
We installed Windows 8.1 when it came out yesterday, and the new DisplayLink driver, and while I’m sure there’s issues there somewhere, all of our quick tests showed good results in a production environment.
So for anyone updating to Windows 8.1, please install the DisplayLink 7.4 Preview driver. You can even do this before the upgrade – the 7.4 preview works also on earlier versions of Windows, and when 8.1 does a re-enumeration it will find the driver if you’ve already converted over. A reboot may be required to get things to settle.
Hope that helps – and if you do find any issues, let us know. Or post on DisplayLink’s forum (the link above) to get the feedback directly to them.
Thanks again for posting to ask!