Hi thank's for your help. I rollback two custom modification ans it's working again :

• reduce #define HOLD_TIMEOUT from24 to 20 & reduce #define RELEASE_TIMEOUT from 18 to 16
• Apply #2027884 & #2027883 correction suggestion from https://bugs.launchpad.net/flashlight-firmware/+bugs?orderby=importance&start=0

I will investigate which of this two changes cut my turbo off

| (! channel_has_args(cfg.channel_mode)

I test that asap. I already try to comment it and it's work fine :

//if (! arg) {  // first frame only, to allow thermal regulation to work
    uint8_t tl = style_2c ? 150 : turbo_level;
    set_level_and_therm_target(tl);
//}

But I am surprised that the functionality appears in the diagram and that no one remarks that it does not work (3H without Multi channel or 4H with) https://lemmy.world/post/1038159

To test it I flash my flashlight ... :(

Also in following the code style the actual statement would also need to include an IFDEF for multi-channel-config but maybe not necessary for you test locally?

So Mementary Turbo 3H work for you? If you don't own multi channel, MT should be 3H from ON. I think l423 be identical for simple or multi channel.

I can't find where arg should be equals to 0... steady_state always call with arg <> 0

Thank you, I fix it. Does Momentary Turbo 3H/4H work four you?