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

[Manuel Diewald]

On Tue, Jan 13, 2026 at 01:12:22PM +0100, Juerg Haefliger wrote:
> 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(-)
> 
> -- 
> 2.51.0
> 
> 
> -- 
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Acked-by: Manuel Diewald <manuel.diewald at canonical.com>

-- 
 Manuel
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