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pwaller
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Joined: 03 Sep 2007
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PostPosted: Sun Feb 03, 2013 10:05 am    Post subject: usb webcam not working (after udev upgrade) Reply with quote

I've got a
Code:
0ac8:3420 Z-Star Microelectronics Corp. Venus USB2.0 Camera
which has a microphone. The first time I installed the webcam I did exactly nothing and it all worked. I haven't used it for a week or two and now no applications (e.g. cheese) are picking it up, although the microphone works fine. `lshw` reports no hardware unclaimed. The only thing I can think of which could be a likely culpret is the recent udev upgrade.

Any ideas on how I can debug this?
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ssuominen
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PostPosted: Sun Feb 03, 2013 11:11 am    Post subject: Reply with quote

Perhaps start with posting `dmesg` output from the time you plug out (and back in) the camera?
Output of `ls -ld /dev/video*`?
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pwaller
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PostPosted: Sun Feb 03, 2013 11:38 am    Post subject: Reply with quote

There is nothing named /dev/vid*.

Code:
[950433.928870] ehci_hcd 0000:00:1d.0: port 1 remote wakeup
[950433.928887] usb usb2: usb wakeup-resume
[950433.928892] usb usb2: usb auto-resume
[950433.928896] ehci_hcd 0000:00:1d.0: resume root hub
[950433.948754] hub 2-0:1.0: hub_resume
[950433.948767] hub 2-0:1.0: port 1: status 0507 change 0000
[950433.948839] hub 2-0:1.0: state 7 ports 2 chg 0000 evt 0000
[950433.949746] hub 2-0:1.0: state 7 ports 2 chg 0000 evt 0000
[950435.944825] hub 2-0:1.0: hub_suspend
[950435.944837] usb usb2: bus auto-suspend, wakeup 1
[950435.944840] ehci_hcd 0000:00:1d.0: suspend root hub
[950435.944845] ehci_hcd 0000:00:1d.0: suspend failed because a port is resuming
[950435.944848] usb usb2: bus suspend fail, err -16
[950435.944850] hub 2-0:1.0: hub_resume
[950435.944948] ehci_hcd 0000:00:1d.0: GetStatus port:1 status 001005 0  ACK POWER sig=se0 PE CONNECT
[950435.944950] hub 2-0:1.0: port 1: status 0503 change 0004
[950435.944979] hub 2-0:1.0: state 7 ports 2 chg 0002 evt 0000
[950435.944984] ehci_hcd 0000:00:1d.0: GetStatus port:1 status 001005 0  ACK POWER sig=se0 PE CONNECT
[950435.955787] usb 2-1: usb wakeup-resume
[950435.955798] usb 2-1: finish resume
[950435.956090] hub 2-1:1.0: hub_resume
[950435.956329] hub 2-1:1.0: port 2: status 0101 change 0001
[950436.057542] ehci_hcd 0000:00:1d.0: reused qh ffff88022535e100 schedule
[950436.057550] usb 2-1: link qh256-0001/ffff88022535e100 start 1 [1/0 us]
[950436.057562] hub 2-0:1.0: resume on port 1, status 0
[950436.057566] hub 2-0:1.0: port 1, status 0503, change 0004, 480 Mb/s
[950436.057571] hub 2-1:1.0: state 7 ports 8 chg 0004 evt 0000
[950436.057713] hub 2-1:1.0: port 2, status 0101, change 0000, 12 Mb/s
[950436.068694] hub 2-1:1.0: port 2 not reset yet, waiting 10ms
[950436.130401] usb 2-1.2: new high-speed USB device number 7 using ehci_hcd
[950436.141512] hub 2-1:1.0: port 2 not reset yet, waiting 10ms
[950436.237117] usb 2-1.2: skipped 1 descriptor after configuration
[950436.237120] usb 2-1.2: skipped 5 descriptors after interface
[950436.237121] usb 2-1.2: skipped 1 descriptor after endpoint
[950436.237122] usb 2-1.2: skipped 9 descriptors after interface
[950436.237124] usb 2-1.2: skipped 1 descriptor after endpoint
[950436.237125] usb 2-1.2: skipped 4 descriptors after interface
[950436.237126] usb 2-1.2: skipped 2 descriptors after interface
[950436.237126] usb 2-1.2: skipped 1 descriptor after endpoint
[950436.237388] usb 2-1.2: default language 0x0409
[950436.238526] usb 2-1.2: udev 7, busnum 2, minor = 134
[950436.238531] usb 2-1.2: New USB device found, idVendor=0ac8, idProduct=3420
[950436.238534] usb 2-1.2: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[950436.238537] usb 2-1.2: Product: Vimicro USB 2.0 PC Camera (Venus)
[950436.238540] usb 2-1.2: Manufacturer: Vimicro
[950436.238680] usb 2-1.2: usb_probe_device
[950436.238681] usb 2-1.2: configuration #1 chosen from 1 choice
[950436.238858] usb 2-1.2: adding 2-1.2:1.0 (config #1, interface 0)
[950436.239559] usb 2-1.2: adding 2-1.2:1.1 (config #1, interface 1)
[950436.239604] usb 2-1.2: adding 2-1.2:1.2 (config #1, interface 2)
[950436.239634] snd-usb-audio 2-1.2:1.2: usb_probe_interface
[950436.239636] snd-usb-audio 2-1.2:1.2: usb_probe_interface - got id
[950436.242449] usb 2-1.2: adding 2-1.2:1.3 (config #1, interface 3)
[950437.288569] usb 2-1.2: pulseaudio timed out on ep0out len=0/2
[950438.286119] usb 2-1.2: pulseaudio timed out on ep0out len=0/2
[950439.283671] usb 2-1.2: pulseaudio timed out on ep0out len=0/2
[950440.281234] usb 2-1.2: pulseaudio timed out on ep0out len=0/2
[950441.278784] usb 2-1.2: pulseaudio timed out on ep0out len=0/2
[950442.276328] usb 2-1.2: pulseaudio timed out on ep0out len=0/2
[950443.273888] usb 2-1.2: pulseaudio timed out on ep0out len=0/2
[950444.271428] usb 2-1.2: pulseaudio timed out on ep0out len=0/2
[950445.268977] usb 2-1.2: pulseaudio timed out on ep0out len=0/2
[alsa-sink] ratelimit.c: 267 events suppressed
[alsa-sink] asyncq.c: q overrun, queuing locally
[alsa-sink] asyncq.c: q overrun, queuing locally
[alsa-sink] asyncq.c: q overrun, queuing locally
[alsa-sink] asyncq.c: q overrun, queuing locally
[alsa-sink] asyncq.c: q overrun, queuing locally
[alsa-sink] asyncq.c: q overrun, queuing locally
[alsa-sink] asyncq.c: q overrun, queuing locally
[alsa-sink] asyncq.c: q overrun, queuing locally
[alsa-sink] asyncq.c: q overrun, queuing locally
[alsa-sink] asyncq.c: q overrun, queuing locally
[alsa-sink] asyncq.c: q overrun, queuing locally
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pwaller
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PostPosted: Sun Feb 03, 2013 11:39 am    Post subject: Reply with quote

Sorry, the above was plugging in, and this is taking it out:

Code:
[950668.386566] hub 2-1:1.0: state 7 ports 8 chg 0000 evt 0004
[950668.386807] hub 2-1:1.0: port 2, status 0100, change 0001, 12 Mb/s
[950668.386809] usb 2-1.2: USB disconnect, device number 7
[950668.386810] usb 2-1.2: unregistering device
[950668.386812] usb 2-1.2: unregistering interface 2-1.2:1.0
[950668.386851] usb 2-1.2: unregistering interface 2-1.2:1.1
[950668.386865] usb 2-1.2: unregistering interface 2-1.2:1.2
[950668.387096] usb 2-1.2: unregistering interface 2-1.2:1.3
[950668.387116] usb 2-1.2: usb_disable_device nuking all URBs
[950668.490929] hub 2-1:1.0: debounce: port 2: total 100ms stable 100ms status 0x100
[950671.164247] hub 2-1:1.0: hub_suspend
[950671.164253] usb 2-1: unlink qh256-0001/ffff88022535e100 start 1 [1/0 us]
[950671.166403] usb 2-1: usb auto-suspend, wakeup 1
[950673.172309] hub 2-0:1.0: hub_suspend
[950673.172320] usb usb2: bus auto-suspend, wakeup 1
[950673.172324] ehci_hcd 0000:00:1d.0: suspend root hub
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zoidie
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PostPosted: Sun Feb 03, 2013 8:36 pm    Post subject: Reply with quote

This may be completely off the mark for you but I've just fixed the same problem. For me a kernel upgrade was the problem as the v4l driver options seem to have moved round a bit.

The tells you where the options are in the kernel:

http://en.gentoo-wiki.com/wiki/Webcam#USB_support
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pwaller
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PostPosted: Sun Feb 03, 2013 8:40 pm    Post subject: Reply with quote

I can't reboot right now, but I'm almost certain this is it. I was surprised to find that "make oldconfig" didn't do what I was expecting (to port the old v4l options over).

Thanks, zoidie!

(Note, this was moving from the 3.5.7-gentoo to 3.6.11-gentoo kernel)
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ssuominen
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PostPosted: Sun Feb 03, 2013 9:08 pm    Post subject: Reply with quote

The `dmesg` output indeed looks like as if the driver wasn't installed (module missing or not built-in to the kernel)

Code:

$ cd /usr/src/linux/drivers/media/usb
$ grep -r 3420
uvc/uvc_driver.c:     .idProduct      = 0x3420,


That's from Linux 3.7.1, so it's definately supported in later kernels.
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