[Nouveau] VAAPI on GeForce GT 620M

[Analabha Roy]

On Tue, 1 Sep 2020 at 18:59, Ilia Mirkin <imirkin at alum.mit.edu> wrote:

> On Tue, Sep 1, 2020 at 9:10 AM Analabha Roy <hariseldon99 at gmail.com>
> wrote:
> > Any suggestions on how to trace the config issues? Do I have to debug
> the va_openDriver() function?
>
> My guess, without reading any code, is that DRI_PRIME isn't doing what
> you want it to, and the nouveau driver is being handed an intel
> device. This does not work well. Fixing this will require tracing
> through the va winsys code which to figure out how it invokes the
> loader.
>
>
> https://cgit.freedesktop.org/mesa/mesa/tree/src/gallium/frontends/va/context.c#n111
>
> For the DRM/rendernodes "platform", it will just take whatever fd it
> is given. vainfo appears to give it a fixed device:
>
>
> https://github.com/intel/libva-utils/blob/master/common/va_display_drm.c#L39
>
> However it looks like you can pass in --device /dev/dri/renderD129 or
> whatever the right one is, which should pass in the right render node,
> as seen here:
>
> https://github.com/intel/libva-utils/blob/master/common/va_display.c#L80
>
> Note that I've never tried this, just did a few google searches to
> find this stuff.
>
>
Brilliant googling. get_drm_device_name() does seem to do a crude argparse
of "--device"

So I ran

$ DRI_PRIME=1 LIBVA_DRIVER_NAME=nouveau vainfo --device /dev/dri/renderD128

*vainfo: unrecognized option '--device'*Show information from VA-API driver
Usage: vainfo --help
        --help print this message

Usage: vainfo [options]
Display options:
        --display display | help         Show information for the specified
display, or the available display list

*        --device device                  Set device name, only available
under drm display*


What does this mean?

 Note that I also ran


$ nm -Dn -o /usr/lib/x86_64-linux-gnu/libva*|grep get_drm_device_name

Didn't get anything...

Cheers,
>
>   -ilia
>


-- 
Analabha Roy
Assistant Professor
Department of Physics
<http://www.buruniv.ac.in/academics/department/physics>
The University of Burdwan <http://www.buruniv.ac.in/>
Golapbag Campus, Barddhaman 713104
West Bengal, India
Emails: daneel at utexas.edu, aroy at phys.buruniv.ac.in, hariseldon99 at gmail.com
Webpage: http://www.ph.utexas.edu/~daneel/
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