#Matter bulb randomly changing 'On level'

1 messages · Page 1 of 1 (latest)

limpid pendant
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I picked up a cheap (Nanoleaf) Matter bulb recently to see what they're like in comparison to my current Hue setup. The bulb behaves quite strangely. When I turn it on with an automation, the bulb turns on at a very low level half of the time, even though it displays as 100%. If I check the event log, I can see the On level control is randomly changing. I think the bulb is doing this and is not HA instructing it to change. No amount of setting the On level back to 255 seems to help. Any thoughts?

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timber temple
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what's the firmware version?

lethal hollow
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This is a known firmware bug in Nanoleaf devices. I've complained about it to them directly in the past.

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I'd expect you to see this on the 4.1.3 firmware on thread Essentials devices (that's the current latest available, as far as I know)

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The current bulb firmware should usually turn back on at the same level as it last was at before it turned off, but handling of fade-outs is incorrect and can result in it writing an incorrect low On level value before turning off. I recommend having your automations turn the bulb on with a specific brightness set whenever possible.

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by spec, the bulb should never be updating the on level value on its own, that value is supposed to be purely for users to configure the bulb and should be "NULL" - represented by the value 255 in the home assistant UI - by default, which means "remember last used brightness and restore it when turning on"

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nanoleaf has said (via a developer message on their discord) that they are still working on the matter/thread stuff so maybe this will get fixed at some point, but this is just one of several annoying issues their devices surrently have.

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fwiw, the Aqara T2 bulbs seem to behave well; I haven't yet tried the newer Hue bulbs with Thread support (they've apparently lauched a lower-priced "Essentials" line which might be worth checking out)

limpid pendant
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I honestly didn't even think about firmware on a the bulb as the update feature is not exposed in Matter. I installed the app, updated and now the issue is fixed. Thanks all.

lethal hollow
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The issue with the onlevel is still present in the current firmware, I think, but restoring the level when turning on might be more reliable?