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thinkpad yoga 370 - poor performance when charging via USB-C

2017-12-20, 23:17 PM

Hello, I am experiencing a problem with my yoga 370


When plugged to lenovo docking station on usb-C, it work fine


however, when pluged to an USB-C power adapter (45W), or an external battery (USB-C - 45W as well), il says it is charging, however :

 - it is not (or very slowly)

 - I am experiencing significant performance drop (laptop using only 10% of CPU power , opening windows setting menu takes more than 10 seconds !)


I just cannot understand why this is happening, USB-C is supposed to be pretty standard, isn't it ?


AND I found that :

 - lenovo chargers are clunky, having a smaller USB-C (apple like) one would be much better 

 - having a spare battery is a must for long flights, ...


Any ways to solve this issues


I seems, according to the link below that this is a bios issue

any comment on this ?



thanks a lot


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Re: thinkpad yoga 370 - poor performance when charging via USB-C

2017-12-21, 20:17 PM

USB-C is not very well standardized when it comes to power input.  The chargers and computers negotiate the required voltages and capacities using a complicated interchange.  The chargers are supposed to be able to provide 5V, 9V, 15V or 20V and up  to 100 watts, but all that is negotiated.  Most non-Lenovo chargers don't implement the negotiating standards or don't supply enough capacity.


I do not respond to requests for private, one-on-one help. Your questions should be posted in the appropriate forum where they may help others as well.

If a response answers your question, please mark it as the accepted solution.

I am not an employee or agent of Lenovo.
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