In the new version 1.9.0 i've got issues with the delivered EQMOD-Driver, which i didn't have in the previous version.
There are several messages indicating wrong file descriptor handling.
>>> Error: Communication failed -> tty write failed, check connection: Bad file descriptor .
Please find detailled log info
I can confirm the same errors after update from the Ubuntu ppa to stable kstars 3.5.3
One problem at the mount is that the on-screen arrow controls in EKOS do not respond correctly. e.g. a nudge north takes a long time to respond to the mouse click and does not stop the slew on releasing the button.
I am using the latest INDI and KStars, and get no such issues with my EQ6-R Pro. I'm using the built-in USB port, not a custom EQDirect cable.
I used to get similar errors with questionable cables (or was it a questionable USB hub, can't remember). Occasionally the computer (Raspberry Pi in my case) would think I unplugged and replugged the USB cable, causing the system to give it a new USB port name (it was /dev/ttyUSB0, now it's /dev/ttyUSB1), and the EQMod driver would throw fits until I gave it the new USB port name.
Haven't had any such problems since upgrading hardware and cables a while back.