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The /dev/mediaX and /dev/cecX devices belong to the video group. Add two default rules for that. The /dev/cecX devices were introduced in kernel 4.8 in staging and moved out of staging in 4.10. These devices support the HDMI CEC bus. The /dev/mediaX devices are much older, but because they are not used very frequently nobody got around to adding this rule to systemd. They let the user control complex media pipelines.