Apart from blacklisting which has the risk of a lockout in case you need to reboot and no ethernet is available, you can also unload the kernel module as follows:

sudo modprobe -r -v brcmfmac 

But I'm not sure unloading the device drivers is a good idea as I fear the wlan0 device may still draw power and even more so if the device drivers' power management features are not loaded, currently I keep drivers loaded and simply make sure the default route via wlan0 is disabled:

sudo ip route del default via <Gateway IP> dev wlan0 

This will make sure all traffic will go via eth0 and (hopefully) be more stable and so forth for example for the ntp daemon.

Apart from blacklisting which has the risk of a lockout in case you need to reboot and no ethernet is available, you can also unload the kernel module as follows:

sudo modprobe -r -v brcmfmac 

But I'm not sure unloading the device drivers is a good idea as I fear the wlan0 device may still draw power and even more so if the device drivers' power management features are not loaded, currently I keep drivers loaded and simply make sure the default route via wlan0 is disabled:

sudo ip route del default via <Gateway IP> dev wlan0 

This will make sure all traffic will go via eth0 and (hopefully) be more stable and so forth for example for the ntp daemon.

Apart from blacklisting which has the risk of a lockout in case you need to reboot and no ethernet is available, you can also unload the kernel module as follows:

sudo modprobe -r -v brcmfmac

But I'm not sure unloading the device drivers is a good idea as I fear the wlan0 device may still draw power and even more so if the device drivers' power management features are not loaded, currently I keep drivers loaded and simply make sure the default route via wlan0 is disabled:

sudo ip route del default via <Gateway IP> dev wlan0

This will make sure all traffic will go via eth0 and (hopefully) be more stable and so forth for example for the ntp daemon,

Apart from blacklisting which has the risk of a lockout in case you need to reboot and no ethernet is available, you can also unload the kernel module as follows:

sudo modprobe -r -v brcmfmac 

But I'm not sure unloading the device drivers is a good idea as I fear the wlan0 device may still draw power and even more so if the device drivers' power management features are not loaded, currently I keep drivers loaded and simply make sure the default route via wlan0 is disabled:

sudo ip route del default via <Gateway IP> dev wlan0 

This will make sure all traffic will go via eth0 and (hopefully) be more stable and so forth for example for the ntp daemon.