Hi,
It is now a couple of years that I was looking for tethering software for my K-5. I even contacted Pentax directly but without result.
Just yesterday I looked again on the Linux fora for solution and I could not believe my eyes. Since last October 2017 the first version of ENTANGLE was released. Totally free and open source!!!
I immediately installed it and after a few minutes trying different camera settings I got it working.
FANTASTIC!!!
The tool allows also a command line interface. You can control a limited number of Camera parameters and the pictures end on your PC hard-disc without problems. So far I found it very stable.
I am curious to read your experiences with the tool and will report back about my findings.
Regards
Stefan