Thanks! I’ve made some more progress, but I’ve been really busy lately and haven’t had much time to continue the investigation. So far I’ve been able to get newer drivers such as a patched 610.74 to load on Windows 10 1507–1607, but they currently run headless with no physical display output. The same patched driver works with physical display output on 1703 and newer. I’d like to continue investigating the 1507–1607 limitation when I have more time. Let me know how your 556.12 testing goes!