Re: [Linux-uvc-devel] Problems with QC 5000 Pro, Ubuntu 5.1, 2.6.12-10-386

[Laurent P. <lau...@sk...>]

Hi Matthias,

> I have got a Logitech Quickcam 5000 Pro and want to use it under linux -
> thus I found and downloaded your driver.
>
> I compiled it using Ubuntu Linux 5.1, kernel 2.6.12-10-386, compilation
> and installation worked fine without warnings.
> But the driver seems to fail on my configuration.
>
> If I'm connecting the QC 5000, dmesg output is:
> =====
> [4296804.731000] usb 3-2: new high speed USB device using ehci_hcd and
> address 7[4296805.114000] usbvideo: Probing device 2
> [4296805.115000] Format MJPEG found
> [4296805.115000] Format Uncompressed found
> [4296805.116000] usbvideo: Found a Status endpoint (addr 87).
> [4296805.116000] usbvideo: Found UVC device (1.00)
> [4296805.117000] usbvideo: Scanning UVC chain: OT 5 <- Unit 4 <- Unit 3
> <- Unit 2 <- IT 1
> [4296805.117000] usbvideo: Found a valid video chain (1 -> 5).
> [4296805.213000] usbvideo: UVC device initialized.
> =====

The device is properly detected as an USB 2.0 peripheral. That's good.

> With your test program posted in
> https://lists.berlios.de/pipermail/linux-uvc-devel/2006-January/000003.html
> using "test /dev/video0" I'm getting the output:
> =====
> #Device /dev/video0 opened: .
> Video format set: width: 640 height: 480 buffer size: 614400
> 16 buffers allocated.
[snip]
> Unable to dequeue buffer (5).
> =====

That's not good.

> I'm getting no output images from the cam, here's the dmesg output:
> =====
> [4297530.434000] usbvideo: uvc_v4l2_open
> [4297530.447000] usbvideo: VIDIOC_QUERYCAP
> [4297530.453000] usbvideo: VIDIOC_S_FMT
> [4297530.453000] usbvideo: Trying format 0x56595559 (YUYV): 1280x960.
> [4297530.531000] usbvideo: VIDIOC_REQBUFS
[snip]
> [4297531.532000] usbvideo: VIDIOC_STREAMON
> [4297531.982000] usbvideo: > uvc_v4l2_release
> [4297532.060000] usbvideo: < uvc_v4l2_release
> =====

Could you try with the latest driver ? Insert the driver and enable capture 
messages with

echo -n 16 > /sys/modules/uvcvideo/parameters/trace

If it fails, try with a newer kernel (2.6.15 or newer). If it still fails, 
please post your dmesg output after running the test program.

> Could you help me? It's very important to realize an university roboter
> project using the qc 5000.

Just a wild guess, will you compete for Eurobot 2006 ?

Laurent Pinchart