Webcam worked before, now does not

cuphandle23 · 11-12-2013, 07:47 AM

Hello,

Im trying to get Guvcview webcam application to work.

But I get error:

Quote:

video device: /dev/video0
unable to detect video devices on your system (0)
ERROR opening V4L interface: No such file or directory

The crazy thing is Guvcview has worked in the past, but now wont.

The webcam is on an Asus Eeepc 901 which runs all the devices linux natively, and I've installed V4L.

lsusb returns :

Quote:

Bus 001 Device 003: ID 04f2:b071 Chicony Electronics Co., Ltd 2.0M UVC Webcam / CNF7129

Any advice?

frankbell · 11-12-2013, 07:56 PM

It sounds like hardware to me. Try booting to a Live CD of something, installing guvcview, and testing. If the webcam itself is broken, no amount of software troubleshooting can save it.

labinnsw · 12-27-2013, 01:10 AM

I strongly doubt that this is the problem. I am having the same problem with a Logitech C615. I tested it on another machine and it worked. I attached a cheap camera to the troubled machine and have the same problem.

Quote:

unable to detect video devices on your system (0)

looks like the root of the problem. If someone can tell me how to fix that, I believe my camera will be detected.

My System is Crunchbang Waldorf.
The camera has worked before and still works on Ubuntu and Windows

aus9 · 12-27-2013, 02:16 AM

any ideas

is the kernel module loading?

2) do you have an older kernel you can test?

Code:

lsmod | grep uvc
uvcvideo               64208  0 
videobuf2_vmalloc       2320  1 uvcvideo
videobuf2_core         28151  1 uvcvideo
videodev              102564  2 uvcvideo,videobuf2_core
media                  11743  2 uvcvideo,videodev

b) what happens to the snippet of your /var/log/messages?

Code:

tail -n 14 /var/log/messages
Dec 27 16:13:35 box kernel: usb 5-7: new high-speed USB device number 4 using ehci-pci
Dec 27 16:13:35 box kernel: usb 5-7: New USB device found, idVendor=046d, idProduct=0990
Dec 27 16:13:35 box kernel: usb 5-7: New USB device strings: Mfr=0, Product=0, SerialNumber=2
Dec 27 16:13:35 box kernel: usb 5-7: SerialNumber: 57061B1F
Dec 27 16:13:35 box mtp-probe: checking bus 5, device 4: "/sys/devices/pci0000:00/0000:00:1d.7/usb5/5-7"
Dec 27 16:13:35 box mtp-probe: bus: 5, device: 4 was not an MTP device
Dec 27 16:13:35 box kernel: media: Linux media interface: v0.10
Dec 27 16:13:35 box kernel: Linux video capture interface: v2.00
Dec 27 16:13:35 box kernel: uvcvideo: Found UVC 1.00 device <unnamed> (046d:0990)
Dec 27 16:13:35 box kernel: input: UVC Camera (046d:0990) as /devices/pci0000:00/0000:00:1d.7/usb5/5-7/5-7:1.0/input/input14
Dec 27 16:13:35 box kernel: usbcore: registered new interface driver uvcvideo
Dec 27 16:13:35 box kernel: USB Video Class driver (1.1.1)
Dec 27 16:13:36 box kernel: usb_audio: Warning! Unlikely big volume range (=3072), cval->res is probably wrong.
Dec 27 16:13:36 box kernel: usb_audio: [5] FU [Mic Capture Volume] ch = 1, val = 4608/7680/1<6>usbcore: registered new interface driver snd-usb-audio

I am using a liquorix kernel from http://liquorix.net/

aus9 · 12-27-2013, 02:19 AM

separate post for separate hardware issue

Dont know how many times I ask, but people sometimes ignore me....grrr

if this is a laptop, you are likely to have a bios setting that enables or disables the webcam

pls pls check.....I am referring to OP but others reading can follow suit.

fuorviato · 12-27-2013, 02:32 AM

If I am right and I guess I am, not all the webcams are supported by uvcvideo, so first of all check if that's not BIOS by chance, then check if uvcvideo is loaded. If it is, it's likely your webcam needs different driver to work. You'll need to find which one (google) and either load it manually or install a distro package. Providing one exists.

labinnsw · 12-27-2013, 03:56 AM

Quote:

separate post for separate hardware issue

Dont know how many times I ask,

Don't count. Just ask as often as necessary. The message will eventually get through.

Quote:

but people sometimes ignore me....grrr

We're not ignoring you. I, like many others I suspect, have seen this request for the first time, plus this thread is the only one I see where an identical problem to mine is being experienced, albeit with different hardware. Another point to consider is that, in the past 8 years, on numerous occasions, I have used other threads to solve my problems even when the hardware is different.
I don't normally post in them if they are old, but this one is new.

Code:

labinnsw@crunchbangpc:~$ lsmod | grep uvc
labinnsw@crunchbangpc:~$

fuorviato · 12-27-2013, 05:20 AM

Login as root and issue the following command

Quote:

modprobe uvcvideo

if the module is loaded correctly it should create your webcam device in /dev.
On my setup it looks like this:

Quote:

ls /dev/vid*
/dev/video0

Tell us if you see the video device after issuing the command.

labinnsw · 12-28-2013, 05:43 AM

It is not loading because it is not installed. Looks like something I did broke the original installation and the installation of all usb video devices. (My TV Tuners no longer work either) I believe it is my Samsung printer's unified driver that made the mess. I have been looking at some solutions but nothing working so far. Even when I reinstall the drivers, they are not loading.

Code:

root@crunchbangpc:/home/labinnsw# modprobe uvcvideo
FATAL: Module uvcvideo not found.
root@crunchbangpc:/home/labinnsw# ls /dev/vid*
ls: cannot access /dev/vid*: No such file or directory
root@crunchbangpc:/home/labinnsw#

aus9 · 12-28-2013, 06:17 AM

labinnsw
I have no objections if you lurk but maybe not post ok?
You are introducing matters or material not mentioned by the OP

Maybe you can start your own thread?

good luck

fuorviato · 12-28-2013, 08:32 AM

Quote:

Originally Posted by labinnsw

It is not loading because it is not installed. Looks like something I did broke the original installation and the installation of all usb video devices. (My TV Tuners no longer work either) I believe it is my Samsung printer's unified driver that made the mess. I have been looking at some solutions but nothing working so far. Even when I reinstall the drivers, they are not loading.

Code:

root@crunchbangpc:/home/labinnsw# modprobe uvcvideo
FATAL: Module uvcvideo not found.
root@crunchbangpc:/home/labinnsw# ls /dev/vid*
ls: cannot access /dev/vid*: No such file or directory
root@crunchbangpc:/home/labinnsw#

Modprobe is missing in your system. Can you install it?

On gentoo, the package containing it is called :

Quote:

kmod

,

official webpage

Providing it's the same for yours, find it and try to install.

labinnsw · 12-28-2013, 04:37 PM

Moved to thread http://www.linuxquestions.org/questi...28#post5088328

aus9 · 12-30-2013, 07:36 AM

labinnsw

thanks for your protocol.

we now await the OP to reply?

aus9 · 12-30-2013, 09:41 PM

cuphandle23

the other poster has had some success with a different kernel as mentioned in link for reply 12 if you wish to peruse