På Sun, 19 Nov 2017 19:01:45 +0100
Michael Rasmussen <[email protected]> skrev:
> On Sun, 19 Nov 2017 18:34:13 +0100
> Anders <[email protected]> wrote:
> 
> > I had a tethred session today, and during the shooting, the cable
> > was disconnected from my camera. Putting it in again, darktable was
> > not able to make things work again. The camera could be found, but
> > pressing at "tethered shooting" button made it say it created a new
> > session, but the photos dissapeared. I rekon it may have worked had
> > I restarted darktable, but I ended up keeping the photos in the
> > camera for the rest of the session - not so nice I believe.
> >   
> When you disconnect your camera the way you describe the session is
> never terminated which means the kernel thinks a camera is using the
> port meaning the device reference stays in the file system. When you
> then connect your camera once again a new session will be created
> which creates another device reference in the file system. Since DT
> obviously was continuing using the old reference nothing showed up in
> DT.

I don't think the kernel have an issue with that, but that is something
I can try, I think that would be visible in dmesg.

> Possible solutions (I have never used tethering so I do not know
> whether my solutions are already implemented in DT):
> 1) You should do a complete reset of tethering in DT

How?

> 2) You should restart DT after creating a new device reference

I will test that :)

> 3) You should forcefully terminate the broken session in your OS

How?

> before reconnecting your camera which should drop the device
> reference and notifying user land applications like DT about the
> termination
> 

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