Re: [REGRESSION] CyberPower LE1000DG (0764:0501) USB HID regression on x86

Hi Lovekesh,

I have now tested 02-resume-reset.patch separately on Linux 7.1.5 with
the CyberPower device 0764:0501.

The patched kernel was active:

  7.1.5-ups-reset-resume

The device was detected by lsusb, but USB initialization still failed:

  usb 1-3: new full-speed USB device number 4 using xhci_hcd
  usb 1-3: New USB device found, idVendor=0764, idProduct=0501
  usb 1-3: New USB device strings: Mfr=3, Product=1, SerialNumber=2
  usb 1-3: can't set config #1, error -71

The UPS therefore never attached to hid-generic and NUT could not use it.

I then returned the same USB cable and UPS to the PiAware NUT server,
where it immediately resumed working normally:

  ups.status: OL
  battery.charge: 100
  input.voltage: 122.0
  output.voltage: 122.0
  ups.load: 23
  driver.version.data: CyberPower HID 0.8

Results so far:

  01-no-lpm.patch: did not resolve the regression
  02-resume-reset.patch: did not resolve the regression

I will proceed with the requested git bisection unless you would like
any additional targeted logs or tests first.

Regards,
Jamie Stephens

On Tue, Aug 4, 2026 at 2:56 PM Lovekesh Solanki
<[email protected]> wrote:
>
> Thanks for the report,
>
> On Thu, Jul 30, 2026 at 03:28:02PM -0400, Jamie Stephens wrote:
> > sudo lsusb -v -d 0764:0501
> >
> > reports:
> >
> > wDescriptorLength     504
> >
> > Warning: can't get report descriptor, LIBUSB_ERROR_PIPE
> >
> > cannot read device status, Resource temporarily unavailable (11)
> >
> > As a result, usbhid-ups is unable to reliably communicate with the
> > device and NUT cannot reliably monitor UPS status.
> The lsusb failure and NUT seem to be seperate, lsusb failure could
> simply be device property.
>
> Few possibilities I can think of worth testing:
> 1) It may be related to LPM, the device may be advertising this but may
> not be handling it properly.
> 2) Commit 8020c41b39f5 (usb: core: allow ACPI-managed hard-wired ports to power off)
> lets acpi managed ports be powered off even if hub does not advertise
> power switching. The UPS may be sitting on such port and its power could
> be cycled out and leave it in a stale state.
>
> I'm attaching two patches to see if they have any effect, please apply
> and test them seperatly and let us know the results.
> And, as per Thorsten's advice above, run git bisection regardless.
>
> Regards,
> Lovekesh