Hacking do any carts (or firmwares) support power saving when the lid is close

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Im using an m3 real and with isakureal (sakura while playing so far). Looks like if Im playing a game and shut the lid, power is still being consumed. Do any of the flash carts (or is it a firmware feature which would mean I have hope), support power saving when the lid is shut?

 

[Monster On Strin]

Umm... it does go to sleep mode when you close the ds

 

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the game does pause. But power consumption seems quite high

 

[Raestloz]

Power consumption is reduced, yes but not to the extent it can last 2 hours longer. My EDGE got no problem whatsoever except with RAM-consuming homebrews (ironically, I don't own RAM pak, that's the reason), however, my R4 1.18 was vulnerable to freezing whenever I close the lid. Not everytime, but with high-power game like CAstlevanias it's quite vulnerable

 

[berkley]

CycloDS has a battery saver feature no one knows how it works but it saves a decent amount of power