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XPS 9370 low power charging after bios update

so, over the past weekend I updated my 9370 to the latest BIOS, and now It won't charge using a 27W charger while on or sleeping, only when completely powered off.  I keep a 27W charger in my travel bag with me instead of carrying around the 45W charger, because it is significantly smaller, and I'm fine with a slower charging rate from that charger. It's a compromise I'm more than happy to make.


But now I can't charge the laptop, even when it's on standby, with that charger. I've looked through the bios and can't find anything that might let me enable this.  Is this a bug in the new firmware, or a new "feature"?

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