linux-kernel - Logitech QuickCam USB detected by Linux, but not user space applications

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Message-ID: <b9140bbf-1537-1431-1250-da0a21208992@molgen.mpg.de>
Date:   Thu, 15 Nov 2018 11:42:32 +0100
From:   Paul Menzel <pmenzel@...gen.mpg.de>
To:     Hans Verkuil <hverkuil@...all.nl>,
        Mauro Carvalho Chehab <mchehab@...nel.org>
Cc:     linux-media@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Logitech QuickCam USB detected by Linux, but not user space
 applications

Dear Linux folks,

I tried to get a Logitech QuickCam USB camera working, but unfortunately, it is 
not detected by user space (Cheese, MPlayer).

It’s an old device, so it could be broken, but as it’s detected by the Linux
kernel, I wanted to check with you first.

Linux 4.18.10 from Debian Sid/unstable is used.

```
$ dmesg
[…]
[ 2891.404361] usb 3-3: new full-speed USB device number 4 using ohci-pci
[ 2891.626934] usb 3-3: New USB device found, idVendor=046d, idProduct=092e, bcdDevice= 0.00
[ 2891.626945] usb 3-3: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[ 2891.626951] usb 3-3: Product: Camera
[ 2891.626957] usb 3-3: Manufacturer:
[ 2893.110249] calling  media_devnode_init+0x0/0x1000 [media] @ 11704
[ 2893.110256] media: Linux media interface: v0.10
[ 2893.110329] initcall media_devnode_init+0x0/0x1000 [media] returned 0 after 56 usecs
[ 2893.210078] calling  videodev_init+0x0/0x79 [videodev] @ 11704
[ 2893.210084] videodev: Linux video capture interface: v2.00
[ 2893.210123] initcall videodev_init+0x0/0x79 [videodev] returned 0 after 21 usecs
[ 2893.333140] calling  gspca_init+0x0/0x1000 [gspca_main] @ 11704
[ 2893.333148] gspca_main: v2.14.0 registered
[ 2893.333161] initcall gspca_init+0x0/0x1000 [gspca_main] returned 0 after 3 usecs
[ 2893.370672] calling  sd_driver_init+0x0/0x1000 [gspca_spca561] @ 11704
[ 2893.370751] gspca_main: spca561-2.14.0 probing 046d:092e
[ 2893.482675] input: spca561 as /devices/pci0000:00/0000:00:12.0/usb3/3-3/input/input17
[ 2893.485415] usbcore: registered new interface driver spca561
[ 2893.485434] initcall sd_driver_init+0x0/0x1000 [gspca_spca561] returned 0 after 112054 usecs
[…]
$ ls -l /dev/video*
crw-rw----+ 1 root video 81, 0 Nov 15 09:26 /dev/video0

$ mplayer tv:// -tv driver=v4l2:device=/dev/video0
MPlayer 1.3.0 (Debian), built with gcc-8 (C) 2000-2016 MPlayer Team
do_connect: could not connect to socket
connect: No such file or directory
Failed to open LIRC support. You will not be able to use your remote control.

Playing tv://.
TV file format detected.
Selected driver: v4l2
 name: Video 4 Linux 2 input
 author: Martin Olschewski <olschewski@....uni-koeln.de>
 comment: first try, more to come ;-)
v4l2: your device driver does not support VIDIOC_G_STD ioctl, VIDIOC_G_PARM was used instead.
Selected device: Camera
 Capabilities:  video capture  read/write  streaming
 supported norms:
 inputs: 0 = spca561;
 Current input: 0
 Current format: unknown (0x31363553)
tv.c: norm_from_string(pal): Bogus norm parameter, setting default.
v4l2: ioctl enum norm failed: Inappropriate ioctl for device
Error: Cannot set norm!
Selected input hasn't got a tuner!
v4l2: ioctl set mute failed: Invalid argument
v4l2: ioctl query control failed: Invalid argument
v4l2: ioctl query control failed: Invalid argument
==========================================================================
Cannot find codec matching selected -vo and video format 0x31363553.
==========================================================================
No stream found.

v4l2: ioctl set mute failed: Invalid argument
v4l2: 0 frames successfully processed, 0 frames dropped.

Exiting... (End of file)
```

Do you have an idea, what the issue. I know it worked fine several years
ago.

Kind regards,

Paul

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