[SRU][Q:raspi/N:raspi][PATCH 0/1] Missing power LED on earlier models (LP: #2060942)

[Juerg Haefliger]

BugLink: https://bugs.launchpad.net/bugs/2060942

[ 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, ...

Juerg Haefliger (1):
  UBUNTU: [Configs] raspi: Set LEDS_TRIGGER_ACTPWR=y and
    LEDS_TRIGGER_INPUT=y

 debian.raspi/config/annotations | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

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2.51.0