[Bug 774811] vaapi: drm: cannot find render node in a hybrid graphics

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=774811

--- Comment #19 from Víctor Manuel Jáquez Leal <vjaquez at igalia.com> ---
Created attachment 341493
  --> https://bugzilla.gnome.org/attachment.cgi?id=341493&action=edit
libs: drm: find render node in hybrid system

Originally the drm backend only tried to open the first render node
found. But in hybrid system this first render node might not support
VA-API (propietary Nvidia driver, for example).

This patch tries all the available nodes until a finding one with a
VA-API supported driver.

https://bugzilla.gnome.org/show_bug.cgi?id=774811

Original-patch-by: Stirling Westrup <swestrup at gmail.com> and
                   Reza Razavi <reza at userful.com>

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