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To:     Hans Verkuil <hverkuil@xs4all.nl>,
        Mauro Carvalho Chehab <mchehab@kernel.org>
Cc:     linux-media@vger.kernel.org,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
From:   Paul Menzel <pmenzel@molgen.mpg.de>
Subject: Logitech QuickCam USB detected by Linux, but not user space
 applications
Message-ID: <b9140bbf-1537-1431-1250-da0a21208992@molgen.mpg.de>
Date:   Thu, 15 Nov 2018 11:42:32 +0100
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Content-Type: text/plain; charset=utf-8
Content-Language: en-US
Content-Transfer-Encoding: quoted-printable

Dear Linux folks,


I tried to get a Logitech QuickCam USB camera working, but unfortunately,=
 it is=20
not detected by user space (Cheese, MPlayer).

It=E2=80=99s an old device, so it could be broken, but as it=E2=80=99s de=
tected by the Linux
kernel, I wanted to check with you first.

Linux 4.18.10 from Debian Sid/unstable is used.

```
$ dmesg
[=E2=80=A6]
[ 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=3D046d, idProduct=3D=
092e, bcdDevice=3D 0.00
[ 2891.626945] usb 3-3: New USB device strings: Mfr=3D1, Product=3D2, Ser=
ialNumber=3D0
[ 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 afte=
r 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 aft=
er 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] returne=
d 0 after 112054 usecs
[=E2=80=A6]
$ ls -l /dev/video*
crw-rw----+ 1 root video 81, 0 Nov 15 09:26 /dev/video0

$ mplayer tv:// -tv driver=3Dv4l2:device=3D/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 cont=
rol.

Playing tv://.
TV file format detected.
Selected driver: v4l2
 name: Video 4 Linux 2 input
 author: Martin Olschewski <olschewski@zpr.uni-koeln.de>
 comment: first try, more to come ;-)
v4l2: your device driver does not support VIDIOC_G_STD ioctl, VIDIOC_G_PA=
RM was used instead.
Selected device: Camera
 Capabilities:  video capture  read/write  streaming
 supported norms:
 inputs: 0 =3D 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
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
Cannot find codec matching selected -vo and video format 0x31363553.
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
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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