HP 15c Collector's Edition save/restore does not work

[ijabbott]

My symptoms are slightly different. In Windows 11, I get a HID device called "HID-compliant vendor-defined device". When I run `VoyagerSave.exe -s filename`, it seems to hang there. I can Ctrl-C back to the CMD prompt, but no file has been created.

(I re-flashed the firmware and verified it just to make sure it was running the correct firmware, but it made no difference.)

Then I tried it in a different USB port and it worked!

The non-working USB device has a path like the following, and is a USB 2.0 port:

Code:

computer
 + ACPI x64-based PC
    + Microsoft ACPI-Compliant System
       + PCI Express Root Complex
          + PCI-to-PCI Bridge
             + AMD USB 3.10 eXtensible Host Controller - 1.10 (Microsoft)
                + USB Root Hub (USB 3.0)
                   + Generic USB Hub
                      + Generic USB Hub
                         + USB Input Device
                            + HID-compliant vendor-defined device

A working device in a USB 2.0 port has a path like the following:

Code:

computer
 + ACPI x64-based PC
    + Microsoft ACPI-Compliant System
       + PCI Express Root Complex
          + PCI-to-PCI Bridge
             + AMD USB 3.10 eXtensible Host Controller - 1.10 (Microsoft)
                + USB Root Hub (USB 3.0)
                   + Generic USB Hub
                      + USB Input Device
                         + HID-compliant vendor-defined device

It has one fewer levels of USB hubs than the non-working device.

Here is another working device in a USB 3.0 port on the same XHCI controller:

Code:

computer
 + ACPI x64-based PC
    + Microsoft ACPI-Compliant System
       + PCI Express Root Complex
          + PCI-to-PCI Bridge
             + AMD USB 3.10 eXtensible Host Controller - 1.10 (Microsoft)
                + USB Root Hub (USB 3.0)
                   + USB Input Device
                      + HID-compliant vendor-defined device

Here is another working device in a USB 3.0 port on a different XHCI controller:

Code:

computer
 + ACPI x64-based PC
    + Microsoft ACPI-Compliant System
       + PCI Express Root Complex
          + PCI-to-PCI Bridge
             + Renasas USB 3.0 eXtensible Host Controller - 1.0 (Microsoft)
                + USB Root Hub (USB 3.0)
                   + USB Input Device
                      + HID-compliant vendor-defined device

So it seems to be sensitive to the number of USB hubs in the chain, or at least the number of USB 2.0 hubs.