NVIDIA hardware, prior to Kepler, only supports XBGR2101010. However
drmAddFB with depth = 30 will use the mapping in
drm_mode_legacy_fb_format and pick the XRGB version of the format.

One solution is to tell userspace "stop using addfb, move to addfb2".
However I'm hoping that there's some sort of semi-clean way of dealing
with such driver eccentricities without resorting to changing
userspace.

Can the ioctl be handled in the driver perhaps? Or would it be
reasonable to add a callback in drm_driver?

Suggestions welcome.

  -ilia
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