[ubuntu] Unstable working of A4Tech PK-8MJ webcam

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http://ubuntuforums.org – Operating Systems: Ubuntu 12.04 Desktop amd64 (liquorix), Windows 7 Ultimate x86-64. Problem: unstable work of webcam. On Windows, camera is working properly, but only after installing vendor's software (despite statements of supporting Plug-n-Play). Native software for UNIX on the official site is absent. In Ubuntu, when reconnecting camera, in the /dev directory appears v4l folder. When starts Cheese, Guvcview or any other program works with a webcam, that catalog sometimes is disappearing, while in these programs it expressed in absences pictures from the camera (black rectangle). Bu (Hardware)