Guest Win10 graphics driver never loads with 3D acceleration enabled on Linux Host

[akdor1154]

Hi,

Win10 x64 acceleration has never worked for me, since even before 5.x came out. The boot splash screen works correctly, but when the login screen is supposed to appear, instead I see the cursor cycle endlessly between pointer -> busy -> background busy over a black screen; the login screen never appears. My guest is entirely up to date and has Oracle (i.e. not Ubuntu) additions 5.0.14 installed; other additions functionality seems to work fine (including guest display resizing if acceleration is disabled). My host is Ubuntu 15.10 x64 running Oracle Virtualbox 5.0.14. I am using Oibaf's git snapshot mesa+drivers ppa in the given log, but I see exactly the same behaviour using the stable graphics stack. (I'm on Intel 4th gen graphics) VBox log attached - is there any other information I can provide?

[akdor1154]

some time in between virtualbox 5.0.26 and 5.1.6, or the Ubuntu upgrade to Xenial, this issue no longer occurs,