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[Bug 2110496] Re: no stream from UVC webcam

To: debcrafters-packages@xxxxxxxxxxxxxxxxxxx
From: Jerry Quinn <2110496@xxxxxxxxxxxxxxxxxx>
Date: Tue, 13 May 2025 19:20:36 -0000
Reply-to: Bug 2110496 <2110496@xxxxxxxxxxxxxxxxxx>
Sender: noreply@xxxxxxxxxxxxx
This also affects older kernel from ubuntu 22.04. See
https://bugs.launchpad.net/ubuntu/+source/linux-meta-
hwe-6.8/+bug/2098034

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https://bugs.launchpad.net/bugs/2110496

Title:
  no stream from UVC webcam

Status in libcamera package in Ubuntu:
  New

Bug description:
  jlquinn@cerberus:~/sw/src/libcamera$ lsb_release -rd
  No LSB modules are available.
  Description:	Ubuntu 24.04.2 LTS
  Release:	24.04
  jlquinn@cerberus:~/sw/src/libcamera$ apt-cache policy pkgname libcamera0.2
  libcamera0.2:
    Installed: 0.2.0-3fakesync1build6
    Candidate: 0.2.0-3fakesync1build6
    Version table:
   *** 0.2.0-3fakesync1build6 500
          500 http://us.archive.ubuntu.com/ubuntu noble/main amd64 Packages
          100 /var/lib/dpkg/status
  N: Unable to locate package pkgname

  
  I'm trying to get a webcam working and having no success.  I don't know if libcamera is the right component to put this against, but I'm starting here.

  When I plug in the camera, the logs show:

  ```
  May 12 14:31:09 cerberus kernel: usb 3-11.3: new high-speed USB device number 32 using xhci_hcd
  May 12 14:31:10 cerberus kernel: usb 3-11.3: New USB device found, idVendor=26e0, idProduct=6230, bcdDevice= 1.00
  May 12 14:31:10 cerberus kernel: usb 3-11.3: New USB device strings: Mfr=2, Product=1, SerialNumber=3
  May 12 14:31:10 cerberus kernel: usb 3-11.3: Product: L01 HD Webcam  
  May 12 14:31:10 cerberus kernel: usb 3-11.3: Manufacturer: Sonix Technology Co., Ltd.
  May 12 14:31:10 cerberus kernel: usb 3-11.3: SerialNumber: SN0001
  May 12 14:31:10 cerberus kernel: usb 3-11.3: Found UVC 1.00 device L01 HD Webcam   (26e0:6230)
  May 12 14:31:10 cerberus kernel: usb 3-11.3: Failed to query (GET_INFO) UVC control 5 on unit 1: 0 (exp. 1).
  May 12 14:31:10 cerberus kernel: usb 3-11.3: Failed to query (GET_INFO) UVC control 7 on unit 1: 0 (exp. 1).
  May 12 14:31:10 cerberus kernel: usb 3-11.3: Failed to query (GET_INFO) UVC control 9 on unit 1: 0 (exp. 1).
  May 12 14:31:10 cerberus kernel: usb 3-11.3: Failed to query (GET_INFO) UVC control 10 on unit 1: 0 (exp. 1).
  May 12 14:31:10 cerberus kernel: usb 3-11.3: Failed to query (GET_INFO) UVC control 12 on unit 1: 0 (exp. 1).
  May 12 14:31:10 cerberus kernel: usb 3-11.3: Failed to query (GET_INFO) UVC control 14 on unit 1: 0 (exp. 1).
  May 12 14:31:10 cerberus kernel: usb 3-11.3: Failed to query (GET_INFO) UVC control 16 on unit 1: 0 (exp. 1).
  May 12 14:31:10 cerberus kernel: usb 3-11.3: 3:1: cannot get freq at ep 0x84
  May 12 14:31:10 cerberus mtp-probe[83099]: checking bus 3, device 32: "/sys/devices/pci0000:00/0000:00:14.0/usb3/3-11/3-11.3"
  May 12 14:31:10 cerberus mtp-probe[83099]: bus: 3, device: 32 was not an MTP device
  May 12 14:31:10 cerberus pipewire[15704]: spa.v4l2: '/dev/video0' VIDIOC_QUERYCTRL: Broken pipe
  May 12 14:31:10 cerberus kernel: usb 3-11.3: Failed to query (GET_DEF) UVC control 12 on unit 1: 0 (exp. 3).
  May 12 14:31:10 cerberus kernel: usb 3-11.3: Failed to query (GET_DEF) UVC control 12 on unit 1: 0 (exp. 3).
  May 12 14:31:10 cerberus pipewire[15704]: spa.v4l2: '/dev/video0' VIDIOC_QUERYCTRL: Broken pipe
  May 12 14:31:10 cerberus kernel: usb 3-11.3: Failed to query (GET_DEF) UVC control 12 on unit 1: 0 (exp. 3).
  May 12 14:31:10 cerberus mtp-probe[83143]: checking bus 3, device 32: "/sys/devices/pci0000:00/0000:00:14.0/usb3/3-11/3-11.3"
  May 12 14:31:10 cerberus wireplumber[30571]: <WpPortalPermissionStorePlugin:0x6347b33119e0> Failed to call Lookup: GDBus.Error:org.freedesktop.portal.Error.NotFound: No entry for camera
  May 12 14:31:10 cerberus mtp-probe[83143]: bus: 3, device: 32 was not an MTP device
  May 12 14:31:10 cerberus pipewire[15704]: [14:06:10.169681267] [15704]  INFO Camera camera_manager.cpp:284 libcamera v0.2.0
  May 12 14:31:10 cerberus kernel: usb 3-11.3: Failed to query (GET_DEF) UVC control 12 on unit 1: 0 (exp. 3).
  May 12 14:31:10 cerberus kernel: usb 3-11.3: 3:1: cannot get freq at ep 0x84
  May 12 14:31:10 cerberus kernel: usb 3-11.3: 3:1: cannot get freq at ep 0x84
  May 12 14:31:10 cerberus wireplumber[30571]: <WpPortalPermissionStorePlugin:0x6347b33119e0> Failed to call Lookup: GDBus.Error:org.freedesktop.portal.Error.NotFound: No entry for camera
  ```

  So the kernel can see the device.

  libcamera includes a simple program called cam to quickly use the
  camera.  Here's what happens when I try:

  ```
  jlquinn@cerberus:~/sw/src/libcamera$ cam -c 1 --list-controls
  [13:47:47.508290998] [80875]  INFO Camera camera_manager.cpp:284 libcamera v0.2.0
  Using camera \_SB_.PCI0.XHCI.RHUB.HS11-11.3:1.0-26e0:6230 as cam0
  Control: AeEnable: [false..true]
  Control: AnalogueGain: [1.000000..4.000000]
  Control: ExposureTime: [100..500000]
  Control: Saturation: [0.000000..2.415094]
  Control: Contrast: [0.500000..1.500000]
  Control: Brightness: [-1.000000..1.000000]
  jlquinn@cerberus:~/sw/src/libcamera$ cam -c 1 --list-properties
  [13:47:55.955207175] [80879]  INFO Camera camera_manager.cpp:284 libcamera v0.2.0
  Using camera \_SB_.PCI0.XHCI.RHUB.HS11-11.3:1.0-26e0:6230 as cam0
  Property: SystemDevices = [ 20736 ]
  Property: PixelArrayActiveAreas = [ (0, 0)/1920x1080 ]
  Property: PixelArraySize = 1920x1080
  Property: Location = 2
  Property: Model = L01 HD Webcam  : L01 HD Webcam 
  jlquinn@cerberus:~/sw/src/libcamera$ cam -c 1 --capture=10 -F
  [13:48:39.132754161] [80911]  INFO Camera camera_manager.cpp:284 libcamera v0.2.0
  Using camera \_SB_.PCI0.XHCI.RHUB.HS11-11.3:1.0-26e0:6230 as cam0
  [13:48:39.143768605] [80911]  INFO Camera camera.cpp:1183 configuring streams: (0) 1920x1080-MJPEG
  [13:48:39.421476856] [80914] ERROR V4L2 v4l2_videodevice.cpp:1906 /dev/video0[13:cap]: Failed to start streaming: Protocol error
  Failed to start capture
  Failed to start camera session
  ```

  ProblemType: Bug
  DistroRelease: Ubuntu 24.04
  Package: libcamera0.2 0.2.0-3fakesync1build6
  ProcVersionSignature: Ubuntu 6.11.0-25.25~24.04.1-generic 6.11.11
  Uname: Linux 6.11.0-25-generic x86_64
  ApportVersion: 2.28.1-0ubuntu3.5
  Architecture: amd64
  CasperMD5CheckResult: unknown
  CurrentDesktop: ubuntu:GNOME
  Date: Mon May 12 14:14:44 2025
  InstallationDate: Installed on 2020-05-29 (1809 days ago)
  InstallationMedia: Ubuntu 18.04.3 LTS "Bionic Beaver" - Release amd64 (20190805)
  ProcEnviron:
   LANG=en_US.UTF-8
   PATH=(custom, no user)
   SHELL=/bin/bash
   TERM=xterm-256color
   XDG_RUNTIME_DIR=<set>
  SourcePackage: libcamera
  UpgradeStatus: Upgraded to noble on 2025-05-01 (12 days ago)

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References

[Bug 2110496] [NEW] no stream from UVC webcam
From: Jerry Quinn, 2025-05-12