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Wenn sich daran in letzter Zeit nichts geändert hat ist HDMI-CEC abhänging vom verwendeten Grafiktreiber, d. h. dieser muß es unterstützen. Du hast jetzt leider nicht dazu geschrieben was Recalbox bei Dir hardwaremäßig bedeutet.
To provide some more technical documentation:
Support for HDMI-CEC is part of the Linux kernel since v4.8. https://01.org/linuxgraphics/gfx-docs/drm/media/kapi/cec-core.html
The CEC adapters made by Pulse Eight already support this and can work as a compatible adapter on x86/x64 machines.
Yes, a comamand to rule them all 😉 thank you again for your support.