I've been experiencing issues with the INDI driver for Altair CCDs (running on Raspberry Pi 4 under Ubuntu 19.10 arm64), using my GPCAM 290M, giving a seemingly cropped image to the top-left portion of the frame. For debugging purposes, I removed the camera from the scope and installed the supplied fisheye lens designed for use as a standalone CCTV camera. This gave an image, at the specified resolution, but only of the top-left part of the frame. Furthermore, the full advertised resolution of 1920x1080 failed to transfer any images - all client software timed out acquiring a picture from the camera.
To try and understand the circumstances better, I started in Ekos from a functioning resolution 960x540 - quarter of the advertised maximum - and worked up from there through the 16:9 ratio. As I increased the resolution, the visible portion increased from the top-left quarter to showing slightly more of the bottom and right. Eventually, at 1536x864, the same behaviour as for 1920x1080 occurred and no images were transferred to the client.
I then tried the same thing using CCDciel connected to INDI and saw exactly the same pattern repeat. However, using the supplied AltairCapture software and a direct USB connection gave an expected image of 1920x1080 resolution and showing the full frame.

Probably I'm missing a setting in the INDI control panel, but couldn't see anything obviously wrong.
Thanks in advance for any advice.

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