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libgphoto2 / libusb access to cameras works only once #103

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@msmeissn

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@msmeissn

Hi,

I am receiving bugreports from various sources, that libgphoto2 / libusb based access to remote control cameras
only works once.

After the first (working) access, the USB device no longer responds to writes, it is unclear if is stalled somehow or
some other USB problem exists.

This is be specific to the Raspberry PI.

Usually only USB bulktransfers are done, but USB interrupts transfers might also have played a role.

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