These are modules that don't get auto-loaded, compared to the
raspberrypi kernel which has them built-in.
/boot/config-5.15.0-1092-raspi:CONFIG_LEDS_TRIGGER_ACTPWR=m
/boot/config-6.8.0-1044-raspi:CONFIG_LEDS_TRIGGER_ACTPWR=m
/boot/config-5.15.0-1092-raspi:CONFIG_LEDS_TRIGGER_INPUT=y
/boot/config-6.8.0-1044-raspi:CONFIG_LEDS_TRIGGER_INPUT=m
Raspberry Pi kernel:
CONFIG_LEDS_TRIGGER_ACTPWR=y
CONFIG_LEDS_TRIGGER_INPUT=y
** Also affects: linux-raspi (Ubuntu Questing)
Importance: Undecided
Status: New
** Also affects: linux-raspi (Ubuntu Noble)
Importance: Undecided
Status: New
** Description changed:
+ [ Impact ]
+
The Pi Zero 2W, 2B, and 3B all fail to light their power LED once the
kernel starts booting under noble (I hope this is only on noble; I only
just noticed this during ISO testing and it's quite possible I missed it
on earlier revisions...).
Specifically, on the 2W (which only has a combined activity and power
LED), /sys/class/leds/ACT/trigger is [actpwr] on RaspiOS, which makes it
illuminate by default and blink off during mmc0 activity. This trigger
setting appears to be unavailable under the Ubuntu kernel.
On the 2B and 3B, the trigger is set to [none] which results in the LED
initially illuminating while the bootloader is running and then
disappearing. The default under RaspiOS is [input] which makes it
illuminate normally, but switch off on undervolt. This trigger settging
also appears unavailable under the Ubuntu kernel.
+
+ [ Test Case ]
+
+ 1. Observe LED behavior during boot.
+ 2. Default modes should be [actpwr]/[input]:
+ $ grep '' /sys/class/leds/*/trigger
+
+ [ Where Problems Could Occur ]
+
+ Additional kernel code is exercised at boot and later. Could cause the
+ usual kernel issues: Crashes, hangs, freezes, splats, ...
** Changed in: linux-raspi (Ubuntu Questing)
Status: New => In Progress
** Changed in: linux-raspi (Ubuntu Noble)
Status: New => In Progress
** Changed in: linux-raspi (Ubuntu Resolute)
Status: Confirmed => In Progress
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https://bugs.launchpad.net/bugs/2060942
Title:
Missing power LED on earlier models
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