I have several Dell 5510 Precision series with the Thunderbolt USB-C adaptor. Each 5510 is plugged into a Dell K17A docking station powered by a Dell 130W power supply. When I connect the docking station via its USB-C connection to the 5510 laptop, I get a BIOS warning that it only sees 95W of the 130W. But the battery charges and the laptop runs. I can turn off the power warning in the BIOS (which is current) but I worry about powering the 5510's Nvidia video card and other components if the BIOS is not seeing all 130 watts.
Plugging in the 130W psu supplied with the laptop has no such BIOS error.
Why does the Dell docking station K17A not see the Dell power supply? Is it throttling it?
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The dock uses some of the AC adapter's capacity to power its own internal electronics. I'm not clear which docking station model the K17A moniker refers to, and it doesn't help that you're using Thunderbolt and USB-C interchangeably, but if you're using the TB16 Thunderbolt Dock, that's only sold with 180W or 240W adapters precisely because of the dock's own power requirements, and this page clearly indicates that the Precision 5000 series requires the TB16 to be powered by a 240W AC adapter: www.dell.com/.../dell-thunderbolt-dock--tb16--information--specifications--frequently-asked-question.... If you're instead using the lower-end WD15 dock, which is only USB-C and not Thunderbolt, and which is sold with either a 130W or 180W adapter, you'd need the 180W version, as specified here: https://www.dell.com/support/article/us/en/19/sln304627/dell-dock-wd15--usb-type-c---information--capability-and-specifications?lang=en
The dock uses some of the AC adapter's capacity to power its own internal electronics. I'm not clear which dock model the K17A moniker refers to and it doesn't help that you're using Thunderbolt and USB-C interchangeably, but if you're using the TB16 Thunderbolt Dock, that model is sold only with 180W and 240W adapters precisely because of the dock's power requirements, and this page shows that a Precision 5000 Series requires a TB16 powered by a 240W adapter to run properly. If you're using the WD15 Dock, which is just USB-C and not Thunderbolt, that model is sold with 130W and 180W adapters, and again the Precision 5000 Series requires the higher 180W adapter, according to this page.