I am using Canon T7i (X9i).
The INDI module I am using is indi-gphoto (2.2 to 201807161307 ~ ubuntu 16.04.1).
Although 1 second capture works, can not capture longer than that (eg 2 seconds).
If the capture operation fails, all subsequent capture commands will not be accepted and capture will be impossible.
Sometimes Err 70 is displayed on the camera.
I will attach a log.
When using Canon EOS 600D, there seems to be no trouble.