Cheese refuses to use webcam

Bug #1868919 reported by Gil Bahat on 2020-03-25
This bug affects 2 people
Affects Status Importance Assigned to Milestone
cheese (Ubuntu)

Bug Description


I have a USB webcam attached to my ubuntu machine:

Bus 001 Device 002: ID 0c45:600d Microdia TwinkleCam USB camera

this device uses gspca_sonixb:

gilbahat@meadow:~$ lsmod | grep gspca
gspca_sonixb 20480 0
gspca_main 24576 1 gspca_sonixb
videobuf2_vmalloc 20480 1 gspca_main
videobuf2_v4l2 24576 1 gspca_main
videobuf2_common 49152 2 gspca_main,videobuf2_v4l2
videodev 225280 4 gspca_main,videobuf2_v4l2,videobuf2_common,gspca_sonixb

the device passes v4l2 tests:

$ v4l2-ctl -d /dev/video0 --all
Driver Info:
 Driver name : sonixb
 Card type : USB camera
 Bus info : usb-0000:00:14.0-1
 Driver version : 5.4.24
 Capabilities : 0x85200001
  Video Capture
  Extended Pix Format
  Device Capabilities
 Device Caps : 0x05200001
  Video Capture
  Extended Pix Format
Priority: 2
Video input : 0 (sonixb: ok)
Format Video Capture:
 Width/Height : 352/288
 Pixel Format : 'S910' (GSPCA SN9C10X)
 Field : None
 Bytes per Line : 352
 Size Image : 126720
 Colorspace : sRGB
 Transfer Function : Default (maps to sRGB)
 YCbCr/HSV Encoding: Default (maps to ITU-R 601)
 Quantization : Default (maps to Full Range)
 Flags :
Streaming Parameters Video Capture:
 Frames per second: invalid (0/0)
 Read buffers : 2

User Controls

                     brightness 0x00980900 (int) : min=0 max=255 step=1 default=127 value=127 flags=slider
                       exposure 0x00980911 (int) : min=0 max=1023 step=1 default=66 value=66 flags=inactive
                 gain_automatic 0x00980912 (bool) : default=1 value=1 flags=update
                           gain 0x00980913 (int) : min=0 max=31 step=1 default=15 value=15 flags=inactive

the device even works with vlc when opened as a v4l2 capture device and picture is detected and displayed.

however, cheese just insists there is no webcam installed, even when run with -d /dev/video0 on the command line.

system details:

$ lsb_release -rd
Description: Ubuntu Focal Fossa (development branch)
Release: 20.04

$ dpkg -l | grep cheese
ii cheese 3.34.0-1build1 amd64 tool to take pictures and videos from your webcam

expected behaviour:

/dev/video0 appears on the list of usable devices and cheese uses it

observed behaviour:

cheese complains about no video devices being available.
ProblemType: Bug
ApportVersion: 2.20.11-0ubuntu21
Architecture: amd64
DistroRelease: Ubuntu 20.04
InstallationDate: Installed on 2020-03-23 (1 days ago)
InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Alpha amd64 (20200315)
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
Package: cheese 3.34.0-1build1
PackageArchitecture: amd64
ProcVersionSignature: Ubuntu 5.4.0-18.22-generic 5.4.24
 cheese 3.34.0-1build1
 cheese-common 3.34.0-1build1
Tags: focal gstreamer-error
Uname: Linux 5.4.0-18-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin lxd plugdev sambashare sudo video
_MarkForUpload: True 07/09/2018
dmi.bios.vendor: Intel Corp.
dmi.bios.version: PYBSWCEL.86A.0074.2018.0709.1332 NUC5CPYB
dmi.board.vendor: Intel Corporation
dmi.board.version: H61145-413
dmi.chassis.type: 3
dmi.modalias: dmi:bvnIntelCorp.:bvrPYBSWCEL.86A.0074.2018.0709.1332:bd07/09/2018:svn:pn:pvr:rvnIntelCorporation:rnNUC5CPYB:rvrH61145-413:cvn:ct3:cvr:

apport information

tags: added: apport-collected focal gstreamer-error
description: updated

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Sebastien Bacher (seb128) wrote :

Thank you for your bug report. Could add your 'journalctl -b 0' log after getting the issue?

Could you start it using that command
$ GST_DEBUG=*cheese*:3 cheese

and copy the log to the bug?

Changed in cheese (Ubuntu):
status: New → Incomplete
Gil Bahat (gilbahat) wrote :

I have stdout for a run with GST_DEBUG but I don't have instructions to locate the real CheeseDebug.txt.gz , I don't suspect that's all there is to it i'm afraid.

Gil Bahat (gilbahat) wrote :
Sebastien Bacher (seb128) wrote :

Thanks, it doesn't seem to find the device for some reason. Does the webcam work in other softwares?
Also note that the -d option doesn't take a device path, see

Gil Bahat (gilbahat) wrote :

yes, it does, works with vlc.
v4l2-ctl also detects it properly.
interestingly enough, firefox and zoom also detect it properly, but grab only black frames.
chromium fails to detect the webcam at all.

Gil Bahat (gilbahat) wrote :

Hi, can we please untag this from 'incomplete' as I believe it should have all the debug data needed?

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