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New 16" Thinkpads USB-C Power Delivery

2021-09-14, 14:04 PM


I got a question concerning the Thinkpad P1 G4/X1 Extr. G4. Is it possible to power them through the USB-C/Thunderbolt ports? Most probably not if a GPU is installed, but probably with only the Intel iGPU without a dedicated GPU? Are 90W enough, or are the 135W then still mandatory and there is no way of powering and loading via USB-PD? 



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Re:New 16" Thinkpads USB-C Power Delivery

2021-09-14, 23:14 PM

Hello Purtl,


Welcome to Lenovo Community


I checked both of the ThinkPad P1 4th Gen and X1 Extreme Gen 4 PSREF (Product Specifications Reference), and the recommended power delivery are as follows:

Power Adapter:
• 135W slim tip (3-pin) AC adapter
• 170W slim tip (3-pin) AC adapter
• 230W slim tip (3-pin) AC adapter
1. 135W for Intel UHD Graphics, 170W for RTX 3050 Ti Graphics, and 230W for RTX 3060/3070/3080 Graphics

Both machines are loaded with Thunderbolt 4 with Power Delivery 3.0.
It is capable of charging various devices such as smartphones and lightweight laptops which require less than 100W of power. 
Hope this helps.



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Re:New 16" Thinkpads USB-C Power Delivery

2021-09-16, 5:46 AM

Thanks for your response!


So, what does that mean, concerning my question? The Gen4 won't be charged by the PowerDelivery3 ports at all? Just when not running? Just around idle? 


The recommended Power adapters from Intel UHD to RTX 3050 differ just about 35W, even though their actual TDP differ by 65W. If the intel uhd isn't turned off, when using a dedicated GPU, it would be even 75W. That would mean a 100W power adapter would be enough - (even though battery charging could be slowed down) - what is the upper most limit of PD3. So when not pressure-testing your system even 90W could be sufficient.

But that's mere theory. The question is: does it charge at all or is a slim tip power adapter mandatory for running/charging? 


I can't really find something about that in the product specification. But it would be nice to know, that's not really a price range I'm comfortable "trying around".



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Re:New 16" Thinkpads USB-C Power Delivery

2021-09-16, 6:00 AM

What you are really asking is, "Can I trickle-charge my X1 Extreme Gen 4 with a 90W PD3 [Power Delivery 3.0] non-Lenovo USB-C charger, so as to avoid using the supplied Lenovo slim tip AC Wall adapter?"


The short answer is that no one has this X1 Extreme Gen 4 in their hands yet, and we will have to wait for actual users trying this out to see if it works.

~Can one trickle-charge X1 Extreme Gen 4 while operating, with no other external peripherals connected?

~Can one trickle-charge X1 Extreme Gen 4 while it is "Off"?


This also depends on your X1 Extreme Gen 4 configuration, and power-guzzling components that draw more power may well cause this trickle-charge attempt to fail:

~i9 CPU (uses more power)

~4k displays  (uses more power)

~external peripherals connected (uses more power)


Guess time will tell!

Daily Driver: X1 Extreme Gen 3 (X1E-3) | WWAN (mobile broadband)
X1E-3, X1E-1, X1C-9, X1C-4, X1C-3, X230
Retired Thinkpads: X250, T410, T42, 560 (circa 1996)
Also: IBM Thinkpad era computer bag !

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Re:New 16" Thinkpads USB-C Power Delivery

2021-09-16, 16:16 PM



I tried two 45W and a 65W USB-C charger. The X1E Gen 4 w/GeForce RTX review unit I have didn't react to any of them, both while running and shut down. No amber light, either way.


It might need a 95W. I know one of my other laptops completely ignores the 45W USB-C chargers. 


I do agree, we may learn more when more people get their hands on production units.



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