I forgot one thing:

This is the version of Gphoto installed on EeePC.
(2.5.15-2)

I do not know how the communication works between Gphoto, Libgphoto and Ekos but I think it might be useful to know that with these versions of the software the Sony A7S is usable.

I hope this information can be useful to find a solution

I would try to uninstall all Gphoto and Libgphoto and reinstall old versions on the ASUS T100 but I'm a noob and I have no idea how to do without combining disasters

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