Comment 8 for bug 1441843

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Kamilion (kamilion) wrote : Re: X server fails to start on post-final Beta Lubuntu Vivid desktop images in virtual machines

For what it's worth, I have some previous dailys of when it was last working somewhere between febuary and march.
http://files.sllabs.com/files/long-term/downloads/isos/vivid-desktop-2-18-15-i386.iso
http://files.sllabs.com/files/long-term/downloads/isos/vivid-desktop-2-19-15-amd64.iso
Unfortunately, I didn't save the generated hashes, so you can only take my word they're official dailies.

This one, on the other hand, I've unpacked 2-19-15 with ubuntu-builder, ran apt-get update && apt-get distupgrade, and exported the ISO back out with no other modifications on 3-30-15. It is operational.
http://files.sllabs.com/files/long-term/downloads/isos/kamikazi-15.04-beta2-amd64.iso
*this is not an official daily image!*

Should you wish to replicate the process I followed, one can get a hold of the kamikazi-14.10 release from here:
https://github.com/kamilion/kamikazi-deploy
Which includes the (xen patched) version of ubuntu-builder used in the above "kamikazi-15.04-beta2-amd64.iso".

Please use these resources to track down the problem; I've been beating on it for a few weeks now but have made no headway.
From what I can see, the VBE fallback is not activating on the current (april) dailies, and yet it does on kamikazi-15.04-beta2.
There must have been a configuration snippet somewhere that no longer exists in a newer package, and I know that 3.19 landed somewhere late February or early march along with some changes to KMS/DRM bringup. That is where I suspect we are missing a configuration line that once was there in the past.