[ltp] Re: how to trick a W540 or P70 into charging from a 90-110W power supply?

linux-thinkpad@linux-thinkpad.org linux-thinkpad@linux-thinkpad.org
Sat, 12 Mar 2016 11:38:50 -0800

On Wed, Feb 24, 2016 at 03:45:52PM -0800, Marc MERLIN wrote:
> Both those laptops use a 170W power supply which is freaking huge, and also
> means that I can't use any of the 10+ regular 20V lenovo 90-110W power supplies
> I have at work and at home (AC, DC 12V, and laptop battery packs)
> When I plug any of them into my P70, it will not discharge, but it will not
> charge either.
> Even if I shut down the laptop, or put it to sleep, it will not charge.
> Yet, when I plug it in to keep it alive, it only uses about 25W from my 110W
> power supply, so there is plenty of room to charge the battery, even if not
> at full speed.
> I'm not sure how the laptop detects the fact that I don't have a 170W power
> supply, but I'd love to know a way to trick it into charging from a smaller
> power supply.

Here is the fix:

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Microsoft is to operating systems ....
                                      .... what McDonalds is to gourmet cooking
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