Public bug reported:
This is more of a feature request...
Background - I have developed a USB device implementing 4 CDC ports
using an STM32F103. To get this working it required the USB device
configuration to use shared endpoints for the notifications.
I have tested this device with Win10 H2, where it is recognised and is
fully functional.
However I find that Ubuntu 25.10 using 6.17.0-6-generic refuses to load
the cdc_acm driver, complaining about the duplicated endpoints.
[10674.514353] usb 3-4.1.4.3: reset SuperSpeed USB device number 7 using
xhci_hcd
[10674.599769] usb 1-4.1.4.4.3: new full-speed USB device number 9 using
xhci_hcd
[10674.690185] usb 1-4.1.4.4.3: config 1 interface 2 altsetting 0 has a
duplicate endpoint with address 0x83, skipping
[10674.690204] usb 1-4.1.4.4.3: config 1 interface 4 altsetting 0 has a
duplicate endpoint with address 0x83, skipping
[10674.690211] usb 1-4.1.4.4.3: config 1 interface 6 altsetting 0 has a
duplicate endpoint with address 0x83, skipping
[10674.693124] usb 1-4.1.4.4.3: New USB device found, idVendor=cafe,
idProduct=4004, bcdDevice= 1.00
[10674.693141] usb 1-4.1.4.4.3: New USB device strings: Mfr=1, Product=2,
SerialNumber=3
[10674.693146] usb 1-4.1.4.4.3: Product: Quad Isolated Serial VCP
[10674.693150] usb 1-4.1.4.4.3: Manufacturer: Gromit's
[10674.693153] usb 1-4.1.4.4.3: SerialNumber: 30FF6B06304D453115410143
[10674.717429] cdc_acm 1-4.1.4.4.3:1.0: ttyACM2: USB ACM device
[10674.721612] cdc_acm 1-4.1.4.4.3:1.2: probe with driver cdc_acm failed with
error -22
[10674.722376] cdc_acm 1-4.1.4.4.3:1.4: probe with driver cdc_acm failed with
error -22
[10674.723192] cdc_acm 1-4.1.4.4.3:1.6: probe with driver cdc_acm failed with
error -22
Instead of skipping the interfaces, the driver should just issue a warning
about the duplicate endpoint and proceed anyway.
** Affects: ubuntu
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/2137095
Title:
25.10 USB devices with duplicated endpoints are skipped
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