It is not possibile to disable the image slideshow when entering the No Signal state (e.g. on HDMI input with no signal on the cable). After 15 minutes of no signal, the TV does a power off; it is not possibile to modifiy the 15 minutes wait time.
The BMAX Mini PC Gemini Lake N4000 does not seems to support the CEC protocol. No mention of CEC function in BIOS and cec-client does not detect a device:
cec-client -l libCEC version: 6.0.2, compiled on Linux ... , features: P8_USB, DRM, P8_detect, randr, Exynos, Linux, AOCEC Found devices: NONE
dmidecode -s system-product-name Intel dmidecode -s bios-version V2.0_231 dmidecode -s bios-release-date 09/14/2024