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

Hi,

Per the recommendation on Proxmox Bugzilla #7850, I=E2=80=99m reporting wha=
t
appears to be a Linux USB/HID regression affecting a CyberPower
LE1000DG UPS.

Hardware

UPS

CyberPower LE1000DG
USB VID:PID 0764:0501

Affected x86 platform

Intel Tiger Lake-H USB 3.2 Gen 2 xHCI Host Controller
PCI ID: 8086:43ed

Problem

When connected to the x86 system, the UPS enumerates successfully and
is bound by the kernel to hid-generic.

Kernel messages include:

usb 1-3: New USB device found, idVendor=3D0764, idProduct=3D0501

usb 1-3: Product: LE1000DG

hid-generic 0003:0764:0501.0001: hiddev0,hidraw0:

USB HID v1.11 Device [CPS LE1000DG]

However,

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.

Kernels Tested

The issue reproduces on:

Proxmox VE kernel 7.0.14-5-pve
Proxmox VE kernel 7.0.14-6-pve
Ubuntu mainline 7.1.5-070105-generic

Reproducing the issue on an Ubuntu mainline kernel indicates the
behavior is not specific to Proxmox and appears to exist in upstream
Linux as well.

Comparison

The identical UPS, USB cable, and NUT configuration were moved to a
Raspberry Pi 5 running:

Debian 13 (trixie)
Linux 6.18.34+rpt-rpi-2712
NUT 2.8.1

On the Raspberry Pi:

the device binds successfully to hid-generic
usbhid-ups initializes successfully
NUT communicates reliably
upsc ups@localhost consistently returns complete UPS status, including
charge, runtime, voltage, load, and other telemetry

This behavior has remained reliable through repeated testing and reboots.

For completeness, lsusb -v on the Raspberry Pi also reports the HID
report descriptor as unavailable. Despite this, usbhid-ups
communicates with the UPS reliably. The communication failure only
occurs on the affected x86 platform.

Troubleshooting Performed

Tested multiple USB ports
Tested USB 2.0 and USB 3.x ports
Replaced the USB cable
Tested NUT 2.8.1, 2.8.5, and current development master
Tested as both root and the nut service user
Verified udev permissions
Verified USB VID:PID 0764:0501
Reproduced the issue on Ubuntu mainline 7.1.5

A Proxmox developer suggested this may require a USB HID device quirk
and requested that the issue be reported upstream.

Reference:

Proxmox Bugzilla #7850: https://bugzilla.proxmox.com/show_bug.cgi?id=3D7850

Please let me know if additional information would be helpful. I can
provide complete dmesg, lsusb, and usbhid-upsdebug logs or perform
additional testing if needed.

Thank you,
Jamie Stephens