Cheese webcam image dropping at random launch

[lotuspsychje]

Ubuntu 20.04 development branch with kernel 5.3.0-18-generic all up to date to latest @ 8/11/2019

After the launch of cheese webcam image drops to black image
at random launches, sometimes after a reboot it works again
properly, and the next launch goes to black again.

Compared with Kamoso where everything works fine.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: cheese 3.34.0-1
ProcVersionSignature: Ubuntu 5.3.0-18.19-generic 5.3.1
Uname: Linux 5.3.0-18-generic x86_64
ApportVersion: 2.20.11-0ubuntu9
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Fri Nov 8 09:21:07 2019
InstallationDate: Installed on 2019-10-25 (14 days ago)
InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Alpha amd64 (20191021)
MachineType: Notebook N7x0WU
RelatedPackageVersions:
 cheese 3.34.0-1
 cheese-common 3.34.0-1
SourcePackage: cheese
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 01/07/2019
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 7.13
dmi.board.asset.tag: Tag 12345
dmi.board.name: N7x0WU
dmi.board.vendor: Notebook
dmi.board.version: Not Applicable
dmi.chassis.type: 10
dmi.chassis.vendor: No Enclosure
dmi.chassis.version: N/A
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr7.13:bd01/07/2019:svnNotebook:pnN7x0WU:pvrNotApplicable:rvnNotebook:rnN7x0WU:rvrNotApplicable:cvnNoEnclosure:ct10:cvrN/A:
dmi.product.family: Not Applicable
dmi.product.name: N7x0WU
dmi.product.sku: Not Applicable
dmi.product.version: Not Applicable
dmi.sys.vendor: Notebook
lsusb:
 Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
 Bus 001 Device 003: ID 8087:0025 Intel Corp.
 Bus 001 Device 002: ID 04f2:b59e Chicony Electronics Co., Ltd Chicony USB2.0 Camera
 Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

[Sebastien Bacher (seb128)]

Thank you for your bug report. Could you add your 'journalctl -b 0' log after getting the issue (also please indicate the time when you hit the problem, it makes easier to see the right part of the log)?
Did you use 19.10 before and was it working better there?

[lotuspsychje (lotuspsychje)]

journal logs after launching cheese:

nov 08 19:04:29 RooTBoX dbus-daemon[2458]: [session uid=1000 pid=2458] Activating service name='org.gnome.Cheese' requested by ':1.52' (uid=1000 pid=2671 comm="/usr/bin/gnome-shell " label="unconfined")
nov 08 19:04:29 RooTBoX dbus-daemon[2458]: [session uid=1000 pid=2458] Successfully activated service 'org.gnome.Cheese'
nov 08 19:04:29 RooTBoX /usr/lib/gdm3/gdm-x-session[2429]: (II) modeset(0): EDID vendor "BOE", prod id 1833
nov 08 19:04:29 RooTBoX /usr/lib/gdm3/gdm-x-session[2429]: (II) modeset(0): Printing DDC gathered Modelines:
nov 08 19:04:29 RooTBoX /usr/lib/gdm3/gdm-x-session[2429]: (II) modeset(0): Modeline "1920x1080"x0.0 141.40 1920 1968 2000 2142 1080 1083 1089 1100 +hsync -vsync (66.0 kHz eP)
nov 08 19:04:29 RooTBoX xdg-desktop-por[2611]: Failed to get application states: GDBus.Error:org.freedesktop.portal.Error.Failed: Could not get window list: GDBus.Error:org.freedesktop.DBus.Error.AccessDenied: App introspection not allowed

On the same machine i used 18.04 where it was working fine

[Sebastien Bacher (seb128)]

Could you add the log from
$ GST_DEBUG=*cheese*:3 cheese

[lotuspsychje (lotuspsychje)]

Changed bug to invalid
as its a hardware problem:

the webcam is flashing to dark when the environment is too dark
with daylight, the webcam works