Highlighted
1 Copper

Dell XPS 15 7590 USB-C charging 65W.

I have a 90W USB-C power adapter that goes 20V/4.5A and I use a USB-IF certified USB-C gen 2 (10gbs/5A/100W), and when I connect it through the thunderbolt port on my Dell XPS 15 7590, a warning that tells that the charger is slow appears. Also, on the BIOS, it only recognize my charger as a 65W charger. I have also tried a Macbook pro 87W usb-c charger and the same message appears. The power adapters and usb-c cables are not the problem since I have tested many.

How can I resolve this? The max input could not be 65W since Dell sells a 130W usb-c power adapter for this laptop... 

Please help, I do not want to use an enormous 130W adapter when travelling, but 65W is way too slow.

0 Kudos
4 Replies
Highlighted
3 Cadmium

Re: Dell XPS 15 7590 USB-C charging 65W.

USB-C devices are not required to take any power level offered by the charger. For some reason, XPS 15 tends to accept 65W or 60W @ 20V, even if the charger offers some more. Mind anything under 130W tends to result in a restricted mode, and 130W is in fact above the USB PD standard (max 100W), so I wouldn't expect anything non-Dell to work. Though, 60W is more than enough for office work and web browsing, as a travel charger...

0 Kudos
Highlighted
6 Indium

Re: Dell XPS 15 7590 USB-C charging 65W.

@alex345  you can't resolve this, because it's a firmware limitation imposed by Dell itself.  Dell systems at this time seem to be limited to drawing 65W from any non-Dell charger, even when the charger offers more and the system could use more.  I wrote an entire thread about this here.  I personally travel with a 60W charger but I've resigned myself to the fact that it's only useful for charging my system overnight and keeping its battery level maintained.  I basically don't count on being able to use it to charge my system and run it at the same time, only one or the other.

@samos1111  no 65W is not enough for a system that requires 130W.  On both the XPS 15 and similar Lenovo ThinkPad X1 Extreme models, using a 60-65W power source results in noticeable performance throttling even without the GPU active (and very noticeable throttling with it active) and incredibly slow battery charge time.  I manage to make it work for what I need to do on the road, but I can absolutely see why it might not be viable for others.

0 Kudos
Highlighted
3 Cadmium

Re: Dell XPS 15 7590 USB-C charging 65W.

Of course it is throttled down a lot. The GPU seems to be throttled more than on battery and I couldn't change this. The CPU uses the "on battery" values of the power profile and can be un-throttled in the advanced settings. Whether 60W is enough depends a lot on what you're doing. When idling, the consumption can be less than 10W. With full CPU load it reaches 90W, so may need to drain the battery in addition.

I was using a 45W round-plug charger for travelling light with the 9550 and it used to work fine for me (no serious work though). But recently I was having issues because it periodically throttles down really heavily (also on battery). 

0 Kudos
Highlighted
1 Copper

Re: Dell XPS 15 7590 USB-C charging 65W.

Wow, Dell has no real reason to limit this to 65W, as Apple, Lenovo, Microsoft and many others can all be charged from usb-c at more than 65W. What a bad move. Please Dell make a firmware update.

0 Kudos