Am Freitag, 1. Mai 2015, 17:42:59 schrieb Bernhard Kilian:
> I have the same issue with Nikon D300s. Worked fine until a few month ago
> (not shure if it correlate with a dt relase change)
> 
>  "gphoto2 --port usb: --capture-image-and-download"
> works fine
> 
> $ darktable -d camctl
> [camera_control] creating new context 0x11f6500
> [camera_control] loaded 1828 camera drivers.
> [camera_control] registering listener 0x1873240
> 
> output is seen on start up. after switch to tethering no more output is
> seen. only message in dt "no camera availible"

How did you try to go to tethering mode? Probably by hitting 't' on the 
keyboard or by using the view switcher in the top right corner. In general 
that is fine and the intended way to do it, however with the 1.6 series somehow 
an ugly thing was introduced (I fixed it for the upcoming 2.0 already but it's 
not easy to backport) that requires you to click on the "scan for devices" 
button in the "import" module (left side, top) at least once for darktable to 
actually look for connected cameras. That was done to prevent gphoto trying to 
connect to phones using the USB port to charge which made darktable hang for a 
minute or so when starting until that connection attempt timed out.

TL;DR: click on that button and tethering might work again. This will be fixed 
once our development version gets released.

> best regards,
> bernhard

Tobias

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