How can I disable the onboard green heartbeat LED?

[arun-511]

It seems like the green led is beating again with v1.15. As far I understand it's rhythm is related with the CPU frequency. It was silent in few previous builds and I would like to see it disabled again.

[Joshua-Riek]

There were a lot of changes to the kernel and device tree in v1.15. Normally something like this can be easily disabled in sysfs or the device tree, ill take a look later today.

[Joshua-Riek]

You can disable the led through the sysfs interface. The below command will need to be issued every boot, this can be done by putting the command in the file /etc/rc.local.

echo none > /sys/class/leds/status_led/trigger

[arun-511]

Applied and it works. Although the LED does blink for a few seconds during boot. Thank you so much!

[marcoexpo]

Hi, I have a Orange pi 5 pro and the command works for me. However, I can't find the /etc/rc.local file to edit it, so on every boot the LED starts blinking again. Can someone please help me with this. Thank you

[arun-511]

The best solution I found is to disable it in the device tree itself (it won't blink, not even during the boot).
If you are running kernel 6.1 (24.04 builds), then you can just add the overlay files ("disable-led" something) to the /etc/default/u-boot under the overlay field.
If you are running the mainline 6.11 (24.10 next builds) then you need to edit the device tree itself and change the trigger from "heartbeat" to "none".

[marcoexpo]

Soory, could you be more precise. I have kernel 6.1 (24.04 builds) installed. What do you mean by "overlay files"? My /etc/default/u-boot file looks like this:

/etc/default/u-boot - configuration file for u-boot-update(8)

#U_BOOT_UPDATE="true"

#U_BOOT_ALTERNATIVES="default recovery"
#U_BOOT_DEFAULT="l0"
#U_BOOT_PROMPT="1"
#U_BOOT_ENTRIES="all"
#U_BOOT_MENU_LABEL="Debian GNU/Linux"
#U_BOOT_PARAMETERS="ro earlycon"
#U_BOOT_ROOT=""
#U_BOOT_TIMEOUT="50"
#U_BOOT_FDT=""
#U_BOOT_FDT_DIR="/lib/firmware/"
#U_BOOT_FDT_OVERLAYS=""
#U_BOOT_FDT_OVERLAYS_DIR="/lib/firmware/"
#U_BOOT_SYNC_DTBS="false"

Thank you again for the help!

[arun-511]

Sorry for the late reply.

Adding device-tree/rockchip/overlay/orangepi-5-disable-leds.dtb to U_BOOT_FDT_OVERLAYS="" should do the job. Remove # from that line.

Then you need to execute sudo u-boot-update and reboot to make the changes effective.

[SilverDesert]

Do you remove the exit 0 from the file or leave it as it is?

[Joshua-Riek]

Leave the exit 0 at the end of the file

[SilverDesert]

I tried it but it is still blinking. I rebooted and it is still blinking.

[Joshua-Riek]

Which board are you using?

[SilverDesert]

Orange Pi 5 Plus using V1.18

[SilverDesert]

Do I just replace 'enable' with the 'disable' part?

[Joshua-Riek]

A config file can be found at /boot/firmware/ubuntuEnv.txt and will look something like this.

bootargs=root=UUID=2370087c-25a4-4eaf-baea-1e24f3194383 rootfstype=ext4 rootwait rw console=ttyS2,1500000 console=tty1 cgroup_enable=cpuset cgroup_memory=1 cgroup_enable=memory swapaccount=1 systemd.unified_cgroup_hierarchy=0 quiet splash plymouth.ignore-serial-consoles
fdtfile=rk3588-orangepi-5-plus.dtb
overlay_prefix=orangepi-5-plus
overlays=orangepi-5-plus-disable-leds

You will need to remove the orangepi-5-plus-disable-leds text on the line that starts with overlays=.

[SilverDesert]

Is it possible to make the led blink meaningfully like it is with Raspberry Pi instead of just pulsating meaninglessly?

[Joshua-Riek]

Hmm, one moment, let me look at the device tree.

[Joshua-Riek]

There are actually two LEDs. Which by default, are set to a heartbeat pattern.

	blue_led@1 {
		gpios = <&gpio3 RK_PA6 GPIO_ACTIVE_HIGH>;
		label = "blue_led";
		linux,default-trigger = "heartbeat";
		linux,default-trigger-delay-ms = <0>;
	};
    
	green_led@2 {
		gpios = <&gpio3 RK_PB1 GPIO_ACTIVE_HIGH>;
		label = "green_led";
		linux,default-trigger = "heartbeat";
		linux,default-trigger-delay-ms = <0>;
	};

The LED trigger can be changed for both in the device tree or the exposed sysfs LED nodes.

[SilverDesert]

Thanks but I have no idea how to make the leds blink meaningfully. I also have no idea why on earth they made the leds pulsate like a heartbeat.

[Joshua-Riek]

I believe the idea is, once the led starts to blink, that means the kernel has loaded and the OS is starting to boot.

[SilverDesert]

Thanks for your help.

[SilverDesert]

How can I make the led flash green instead of blue and vice versa?

[SilverDesert]

Is it possible?

[Joshua-Riek]

Yes, sorry I've had a busy week, I and give an example later today.

[SilverDesert]

How can I make the led flash green instead of blue and vice versa?
Thanks.

[Joshua-Riek]

Sorry about the delay. I forgot to get back to you.

# Turn off the blue LED
echo none > /sys/class/leds/blue_led/trigger

# Turn off the green LED
echo none > /sys/class/leds/green_led/trigger

# Blink the blue LED in a heartbeat pattern
echo heartbeat > /sys/class/leds/blue_led/trigger

# Blink the green LED in a heartbeat pattern
echo heartbeat > /sys/class/leds/green_led/trigger

Look ledtrig in the kernel for more details.
https://www.kernel.org/doc/html/latest/leds/ledtrig-oneshot.html

[SilverDesert]

Thank you for your kind help.