Hello, I've got a Logitech HD Webcam C525 using the uvcvideo module and I use Linux 3.5 RC4. When this camera is connected to a USB2 port, it does not work most of the time. However it does work fine when connected to a USB 3 port. In Windows it works on both ports. To test the webcam, I use this command with mplayer2: $ mplayer tv:// -tv driver=v4l2:width=1280:height=720:device=/dev/video0 When connected to the USB 3 port, the webcam image is shown correctly, but on a USB 2 port, this output is shown most of the time: MPlayer2 UNKNOWN (C) 2000-2012 MPlayer Team mplayer: could not connect to socket mplayer: No such file or directory Failed to open LIRC support. You will not be able to use your remote control. Playing tv://. Detected file format: TV Selected driver: v4l2 name: Video 4 Linux 2 input author: Martin Olschewski <olschewski@xxxxxxxxxxxxxxxx> comment: first try, more to come ;-) v4l2: unable to open '/dev/video0': Device or resource busy v4l2: ioctl set mute failed: Bad file descriptor v4l2: 0 frames successfully processed, 0 frames dropped. Opening as detected format "TV" failed. Failed to recognize file format. Exiting... (End of file) When connected to the USB 2 port, lsusb -v only shows this information about this webcam: Bus 001 Device 007: ID 046d:0826 Logitech, Inc. Device Descriptor: bLength 18 bDescriptorType 1 bcdUSB 2.00 bDeviceClass 239 Miscellaneous Device bDeviceSubClass 2 ? bDeviceProtocol 1 Interface Association bMaxPacketSize0 64 idVendor 0x046d Logitech, Inc. idProduct 0x0826 bcdDevice 0.10 iManufacturer 0 iProduct 2 iSerial 1 bNumConfigurations 1 Much more info is given by lsusb -v when it's connected to the USB 3 port. Sometimes mplayer does work when connected to the USB 2 port, but after a few seconds, the image starts freezing, and these errors are shown on the console: v4l2: select timeout Here is a uvcvideo trace from a failed attempt in opening the webcam with mplayer2 (is it expected that the USB device appears to disconnect and connect when starting mplayer? I definitely did not disconnect the device when this was logged). [ 1878.994588] uvcvideo: uvc_v4l2_open [ 1879.195761] usb 1-1.2: USB disconnect, device number 15 [ 1879.275132] usb 1-1.2: new full-speed USB device number 16 using ehci_hcd [ 1879.346932] usb 1-1.2: device descriptor read/64, error -32 [ 1879.466715] hub 1-1:1.0: unable to enumerate USB device on port 2 [ 1879.666018] usb 1-1.2: new high-speed USB device number 17 using ehci_hcd [ 1880.024364] usb 1-1.2: New USB device found, idVendor=046d, idProduct=0826 [ 1880.024373] usb 1-1.2: New USB device strings: Mfr=0, Product=2, SerialNumber=1 [ 1880.024377] usb 1-1.2: Product: HD Webcam C525 [ 1880.024380] usb 1-1.2: SerialNumber: 1E83E9D0 [ 1880.291007] uvcvideo: Probing generic UVC device 1.2 [ 1880.291019] uvcvideo: Found format YUV 4:2:2 (YUYV). [ 1880.291022] uvcvideo: - 640x480 (30.0 fps) [ 1880.291025] uvcvideo: - 160x120 (30.0 fps) [ 1880.291027] uvcvideo: - 176x144 (30.0 fps) [ 1880.291030] uvcvideo: - 320x176 (30.0 fps) [ 1880.291032] uvcvideo: - 320x240 (30.0 fps) [ 1880.291034] uvcvideo: - 432x240 (30.0 fps) [ 1880.291037] uvcvideo: - 352x288 (30.0 fps) [ 1880.291039] uvcvideo: - 544x288 (30.0 fps) [ 1880.291042] uvcvideo: - 640x360 (30.0 fps) [ 1880.291044] uvcvideo: - 752x416 (24.0 fps) [ 1880.291046] uvcvideo: - 800x448 (24.0 fps) [ 1880.291048] uvcvideo: - 864x480 (20.0 fps) [ 1880.291051] uvcvideo: - 960x544 (20.0 fps) [ 1880.291053] uvcvideo: - 1024x576 (15.0 fps) [ 1880.291055] uvcvideo: - 800x600 (24.0 fps) [ 1880.291058] uvcvideo: - 1184x656 (15.0 fps) [ 1880.291060] uvcvideo: - 960x720 (15.0 fps) [ 1880.291062] uvcvideo: - 1280x720 (10.0 fps) [ 1880.291065] uvcvideo: - 1392x768 (10.0 fps) [ 1880.291067] uvcvideo: - 1504x832 (7.5 fps) [ 1880.291070] uvcvideo: - 1600x896 (7.5 fps) [ 1880.291072] uvcvideo: - 1280x960 (7.5 fps) [ 1880.291074] uvcvideo: - 1712x960 (5.0 fps) [ 1880.291077] uvcvideo: - 1792x1008 (5.0 fps) [ 1880.291079] uvcvideo: - 1920x1080 (5.0 fps) [ 1880.291081] uvcvideo: Found format MJPEG. [ 1880.291084] uvcvideo: - 640x480 (30.0 fps) [ 1880.291086] uvcvideo: - 160x120 (30.0 fps) [ 1880.291088] uvcvideo: - 176x144 (30.0 fps) [ 1880.291091] uvcvideo: - 320x176 (30.0 fps) [ 1880.291093] uvcvideo: - 320x240 (30.0 fps) [ 1880.291096] uvcvideo: - 432x240 (30.0 fps) [ 1880.291098] uvcvideo: - 352x288 (30.0 fps) [ 1880.291100] uvcvideo: - 544x288 (30.0 fps) [ 1880.291103] uvcvideo: - 640x360 (30.0 fps) [ 1880.291105] uvcvideo: - 752x416 (30.0 fps) [ 1880.291107] uvcvideo: - 800x448 (30.0 fps) [ 1880.291110] uvcvideo: - 864x480 (30.0 fps) [ 1880.291112] uvcvideo: - 960x544 (30.0 fps) [ 1880.291114] uvcvideo: - 1024x576 (30.0 fps) [ 1880.291117] uvcvideo: - 800x600 (30.0 fps) [ 1880.291120] uvcvideo: - 1184x656 (30.0 fps) [ 1880.291123] uvcvideo: - 960x720 (30.0 fps) [ 1880.291125] uvcvideo: - 1280x720 (30.0 fps) [ 1880.291127] uvcvideo: - 1392x768 (30.0 fps) [ 1880.291130] uvcvideo: - 1504x832 (30.0 fps) [ 1880.291263] uvcvideo: - 1600x896 (30.0 fps) [ 1880.291265] uvcvideo: - 1280x960 (30.0 fps) [ 1880.291267] uvcvideo: - 1712x960 (30.0 fps) [ 1880.291270] uvcvideo: - 1792x1008 (30.0 fps) [ 1880.291272] uvcvideo: - 1920x1080 (30.0 fps) [ 1880.291280] uvcvideo: Found a Status endpoint (addr 87). [ 1880.291283] uvcvideo: Found UVC 1.00 device HD Webcam C525 (046d:0826) [ 1880.291399] uvcvideo: Added control 00000000-0000-0000-0000-000000000001/2 to device 1.2 entity 1 [ 1880.291409] uvcvideo: Adding mapping 'Exposure, Auto' to control 00000000-0000-0000-0000-000000000001/2. [ 1880.291414] uvcvideo: Added control 00000000-0000-0000-0000-000000000001/3 to device 1.2 entity 1 [ 1880.291418] uvcvideo: Adding mapping 'Exposure, Auto Priority' to control 00000000-0000-0000-0000-000000000001/3. [ 1880.291422] uvcvideo: Added control 00000000-0000-0000-0000-000000000001/4 to device 1.2 entity 1 [ 1880.291426] uvcvideo: Adding mapping 'Exposure (Absolute)' to control 00000000-0000-0000-0000-000000000001/4. [ 1880.291430] uvcvideo: Added control 00000000-0000-0000-0000-000000000001/6 to device 1.2 entity 1 [ 1880.291434] uvcvideo: Adding mapping 'Focus (absolute)' to control 00000000-0000-0000-0000-000000000001/6. [ 1880.291438] uvcvideo: Added control 00000000-0000-0000-0000-000000000001/11 to device 1.2 entity 1 [ 1880.291442] uvcvideo: Adding mapping 'Zoom, Absolute' to control 00000000-0000-0000-0000-000000000001/11. [ 1880.291447] uvcvideo: Added control 00000000-0000-0000-0000-000000000001/13 to device 1.2 entity 1 [ 1880.291450] uvcvideo: Adding mapping 'Pan (Absolute)' to control 00000000-0000-0000-0000-000000000001/13. [ 1880.291453] uvcvideo: Adding mapping 'Tilt (Absolute)' to control 00000000-0000-0000-0000-000000000001/13. [ 1880.291458] uvcvideo: Added control 00000000-0000-0000-0000-000000000001/8 to device 1.2 entity 1 [ 1880.291461] uvcvideo: Adding mapping 'Focus, Auto' to control 00000000-0000-0000-0000-000000000001/8. [ 1880.291465] uvcvideo: Added control 00000000-0000-0000-0000-000000000101/2 to device 1.2 entity 2 [ 1880.291468] uvcvideo: Adding mapping 'Brightness' to control 00000000-0000-0000-0000-000000000101/2. [ 1880.291473] uvcvideo: Added control 00000000-0000-0000-0000-000000000101/3 to device 1.2 entity 2 [ 1880.291476] uvcvideo: Adding mapping 'Contrast' to control 00000000-0000-0000-0000-000000000101/3. [ 1880.291480] uvcvideo: Added control 00000000-0000-0000-0000-000000000101/7 to device 1.2 entity 2 [ 1880.291483] uvcvideo: Adding mapping 'Saturation' to control 00000000-0000-0000-0000-000000000101/7. [ 1880.291487] uvcvideo: Added control 00000000-0000-0000-0000-000000000101/8 to device 1.2 entity 2 [ 1880.291490] uvcvideo: Adding mapping 'Sharpness' to control 00000000-0000-0000-0000-000000000101/8. [ 1880.291494] uvcvideo: Added control 00000000-0000-0000-0000-000000000101/10 to device 1.2 entity 2 [ 1880.291497] uvcvideo: Adding mapping 'White Balance Temperature' to control 00000000-0000-0000-0000-000000000101/10. [ 1880.291501] uvcvideo: Added control 00000000-0000-0000-0000-000000000101/1 to device 1.2 entity 2 [ 1880.291504] uvcvideo: Adding mapping 'Backlight Compensation' to control 00000000-0000-0000-0000-000000000101/1. [ 1880.291508] uvcvideo: Added control 00000000-0000-0000-0000-000000000101/4 to device 1.2 entity 2 [ 1880.291511] uvcvideo: Adding mapping 'Gain' to control 00000000-0000-0000-0000-000000000101/4. [ 1880.291516] uvcvideo: Added control 00000000-0000-0000-0000-000000000101/5 to device 1.2 entity 2 [ 1880.291519] uvcvideo: Adding mapping 'Power Line Frequency' to control 00000000-0000-0000-0000-000000000101/5. [ 1880.291523] uvcvideo: Added control 00000000-0000-0000-0000-000000000101/11 to device 1.2 entity 2 [ 1880.291526] uvcvideo: Adding mapping 'White Balance Temperature, Auto' to control 00000000-0000-0000-0000-000000000101/11. [ 1880.291535] uvcvideo: Scanning UVC chain: OT 3 <- XU 5 <- IT 1 [ 1880.291541] (-> XU 6 XU 7 XU 8) [ 1880.291541] uvcvideo: Found a valid video chain (1 -> 3). [ 1880.303768] input: HD Webcam C525 as /devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.2/1-1.2:1.2/input/input33 [ 1880.303859] uvcvideo: UVC device initialized. [ 1880.311922] uvcvideo: uvc_v4l2_open [ 1880.312022] uvcvideo: uvc_v4l2_ioctl(VIDIOC_QUERYCAP) [ 1880.312059] uvcvideo: uvc_v4l2_release Motherboard is an Asrock H77 Pro4/MVP. Complete dmesg and lsusb -v output about a failed attempt (on USB 2 port) and a succeeded attempt (on USB 3) can be found on http://artipc10.vub.ac.be/~frederik/webcam/ -- Frederik Himpe -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
