[Libva] invoking intel vaapi without video out on motherboard

[Matt Pekar]

Is it possible to take an intel CPU, motheboard w/out video output, and use
VAAPI through it?

I'm trying to use a custom xorg.conf along these lines:

Section "Device"
        Identifier "intel0"
        Driver "intel"
EndSection

Section "Screen"
        Identifier "screen0"
        Device "intel0"
EndSection

But I'm unable to start X with this:

[  5507.348] (II) intel: Driver for Intel Integrated Graphics Chipsets:
i810,
i810-dc100, i810e, i815, i830M, 845G, 854, 852GM/855GM, 865G, 915G,
E7221 (i915), 915GM, 945G, 945GM, 945GME, Pineview GM, Pineview G,
965G, G35, 965Q, 946GZ, 965GM, 965GME/GLE, G33, Q35, Q33, GM45,
4 Series, G45/G43, Q45/Q43, G41, B43, B43, Clarkdale, Arrandale,
Sandybridge Desktop (GT1), Sandybridge Desktop (GT2),
Sandybridge Desktop (GT2+), Sandybridge Mobile (GT1),
Sandybridge Mobile (GT2), Sandybridge Mobile (GT2+),
Sandybridge Server, Ivybridge Mobile (GT1), Ivybridge Mobile (GT2),
Ivybridge Desktop (GT1), Ivybridge Desktop (GT2), Ivybridge Server,
Ivybridge Server (GT2)
[  5507.348] (--) using VT number 7

[  5507.353] (EE) No devices detected.
[  5507.353]
Fatal server error:
[  5507.353] no screens found
[  5507.354]

Does X check that there is a physical video out on the motherboard for it
to load a device?  Has anyone been able to use X and VAAPI in this sort of
headless mode?  Would a better approach be to ditch X entirely and use
VAAPI through DRM?
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