Similar to a 2016 thread oddly located in the Rand McNally forum here, I found my 3597 would never go into any mode other than normal GPS operation, regardless whether plugged into one of my 2020-manufactured XPS 15's onboard USB connections or an attached dock which included additional USB 3 ports. The OP's solution in that thread was a recommendation to locate and utilize a USB 2 hub, which then worked as expected.
After reading through the rest of that thread, plus futile efforts checking Garmin's Support pages, I remembered I had an old hub that hadn't been used for a couple of years. To my surprise, it was a USB 3.x hub, not USB 2, but nonetheless let my 3597 enter mass storage mode and allowed Garmin Express to find it and apply the current updates.
Garmin's support focus seems to pivot on whether USB connections include data lines or only charging capability and to avoid external hubs. OTOH, given the success found by using an older USB 3 (3.0/3.1 ???) and the other post's USB 2 hub, I'm inclined to think the issue is either the USB drivers and/or whatever chipsets are built into the older hubs.
Does this happen when the PC is on battery or powered up on AC as well?
If battery, check the PowerShare settings to make sure the port you are using is powered up.
Also, what specific model XPS 15 are you using; XPS 15 7590, XPS 15 9500, XPS 15 9530, etc.
It's an XPS 15 7590 on AC power via the adapter port. Hadn't even considered trying running from battery since I was doing an update, but that's a worthwhile consideration to bring up. Until I discovered the 2016 thread's solution, the GPS was waking up upon attaching to any USB port on the laptop or newer hub, but only in regular operational mode.
There is a thread with multiple possible resolutions at https://forums.garmin.com/apps-software/mac-windows-software.... Also, similar discussion on POI-factory at http://www.poi-factory.com/node/46817.
I would just go down the recommendations and see what, if anything might work. Quite a few solutions are simple, one guy buys a simple USB-C to USB 3 adapter as a resolution; another states that if you leave the Garmin attached, after a minute or two it gets into the proper mode for updating.
Some additional info, both of the USB 3.0 ports on the Dell XPS 15 7590 use PowerShare. Go to https://www.dell.com/support/manuals/en-us/xps-15-7590-lapto... and take note of some of the caution (areas shaded blue). One reads "NOTE: If a USB device is connected to the PowerShare port before the computer is turned off or in hibernate state, you must disconnect and connect it again to enable charging.".
Except for the link to the Garmin Forums thread, I'd already found the other sources (including my description of the 2016 poi-factory thread in my OP) and even after a second look--unless I missed something--have found nothing more informative than switching to an older hub. As I understand it, PowerShare doesn't figure into the picture unless running off the laptop's battery.
The issue with Dell and USB ports actually goes back quite some time and if you search long enough and hard enough you'll find people that have Samsung phones and GoPro cameras also have issues.
Having said that a lot of people have had success it updating the appropriate USB driver nut using the one direct from Intel, not Windows. So try the following without any GPS or USB hub connected:
Open Device Manager and drill down to the USB Serial Bus Controller section and look for any node with a yellow exclamation point. In particualr check the USB hub node and see (under properties) if it states it is "Renesas" or Intel(R) USB 3.0 eXtensible Host Controller - 1.0 (Microsoft). If you have any with the yellow exclamation point, right click the node and select uninstall. Exit out of Device Manager, then reboot the PC. It will reinstall the best driver. The retest with your Garmin.
Early on the Renesas drivers were considered the probable issue but Renesas was sold to Intel a few years ago and Intel withdrew support of the particular driver in 2019. Having said all that, if the method of uninstalling and rebooting doesn't work, perhaps connecting to the Intel site might be in order and do updates that are recommended by Intel.
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