cec-ctl

List CEC devices

$ cec-ctl --list-devices

$ sudo cec-ctl -m

$ cec-ctl -S

cec-ctl [options]

cec-ctl controls kernel CEC (Consumer Electronics Control) devices through the Linux kernel's native CEC framework. It provides low-level access to the CEC subsystem for monitoring traffic, configuring adapters, and sending commands directly via the kernel driver.
Unlike cec-client which relies on the userspace libCEC library and requires a USB CEC adapter, cec-ctl works with CEC hardware integrated into graphics cards and SoCs that expose `/dev/cecN` device nodes. This makes it the preferred tool on platforms with built-in CEC support, such as many ARM-based media players and modern Intel GPUs.
The monitor mode (`-m`) is particularly useful for debugging CEC communication issues, as it displays all CEC traffic on the bus in real time.

--list-devices

List available CEC devices

Monitor CEC traffic on the bus

Display the CEC device topology

Use specific CEC device

Set physical address

Set logical address

Requires kernel CEC support (CONFIG_CEC). Monitor mode requires root privileges. Not all HDMI ports support CEC.

cec-client(1)