Description of problem:
after some updates, i've found that if i insert one disk in the dvdwriter,
whenever i wanna eject it, the tray goes out and back in forever, untill i'm
quick enought to get the disc out before the next tray close. _maybe_ it's
because i've burned a disc with k3b before. this is happening even after the k3b
was closed. another thing is that whenever i insert a disc (or start the
computer) the permissions of /dev/sr0 become 600.

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