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96bef051 "drm-backend: add support for writeback connectors" started using DRM_MODE_CONNECTOR_WRITEBACK and DRM_CLIENT_CAP_WRITEBACK_CONNECTORS. These were introduced in libdrm 2.4.95. According to !311 Ubunut Xenial is the only mentioned distribution that does not provide a libdrm new enough. I think that is fine to drop now, 2016 was a good while ago. Libdrm 2.4.95 also introduced DRM_CLIENT_CAP_ASPECT_RATIO, DRM_MODE_PICTURE_ASPECT_64_27, DRM_MODE_PICTURE_ASPECT_256_135. The fallback definitions for the above are dropped. Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.com>
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