Ok, for those who are interested: I was able to run the camera in half the resolution ("INDI Control Panel "-> "Toupcam G3M178C" -> "Controls": setting "Resolution" to "1520+1024") with Debian on a Lenovo T490 Laptop. And finally on a Raspberry Pi 4 with Astroberry, the camera was running in full resolution. Sadly Idid not yet find out, why it is not running with the laptop.

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