[Libva] invoking intel vaapi without video out on motherboard

[Matt Pekar]

Yakui what requirements exist for the motherboard and graphics
configuration for running DRM?  We're trying to use Intel processors for
h264 video encoding in a headless setup.  We have everything working fine
in our desktop X environment, but moving to headless mode is proving tricky.

My impression is that this would be the standard:
* motheboard with a video output (in order to create /dev/dri/card0)
* intel CPU with integrated graphics
* i965 drivers installed to linux

Whereas this case would not be possible:
* motherboard with no video output
* intel CPU with integrated graphics
* i965 drivers can't be installed because there's no output to reference?
* discrete graphics card (ati or nvidia) -- creates /dev/dri/card0 but of
the wrong type

And this would also not be possible:
*motherboard with no video output, but booted in headless mode
* intel CPU with integrated graphics
*i965 drivers are installed, but because no video output is present,
/dev/dri/card0 cannot be created

What sort of hardware/software setups are people successfully using DRM in?
 We have a mishmash of configurations we're trying, but are still learning
the connections between X server, DRM, VAAPI, and the hardware .


On Thu, May 9, 2013 at 12:41 AM, ykzhao <yakui.zhao at intel.com> wrote:

> On Wed, 2013-05-08 at 16:27 -0600, Matt Pekar wrote:
> > 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?
>
> The current libva/intel-vaapi driver can be used even when the X is not
> started.
>
> For example: vainfo/avcenc can work without X.
>
> You can see the corresponding test case of libva about how to use vaapi
> under DRM mode.
>
> thanks.
>
>
>
>
> >
> >
> >
>
>
>
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