Thanks for answering . 
The PC is quite new about 2 years old with windows 7 . I have also seen 
this issue once on another PC .
To sum it up , on this pc when I plug USB then external power , it 
sometimes acts like no external power is applied. (I have the same symptoms 
when powering only using USB but this is normal) .
Seems that there is some code on the bootloader which changes some 
registers on the TPS65217 depending on which current source is applied I 
don t know if it is related.
It is not a big issue but I'd like to understand why such behaviour. 

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