I researched the issue some time ago. My webcam and several others like HP
are affected by a faulty driver for this webcam, which should be the kernel
uvcvideo module. This is the reason why it happens in several progs, like
guvcview and cheese.
vlc does it's own thing and does not rely on the kernel driver. This is the
reason why it's unaffected.
Am 12.08.2017 3:31 PM schrieb "Kai-Heng Feng"
> Nothing suspicious. Why do you think it's a kernel bug?
> You received this bug notification because you are subscribed to the bug
> uvcvideo module does not work with Dell XPS 12 webcam
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uvcvideo module does not work with Dell XPS 12 webcam
Status in linux package in Ubuntu:
uvcvideo: Found UVC 1.00 device Integrated Webcam (0bda:5716) from
Dell XPS 12 laptop (9Q33 version) does not work properly for several
versions of the kernel now.
guvcview nor cheese both show the issue, so it's the uvcvideo driver.
Starting at 640x480 and higher resolutions, parts of lower half of
video flickers / don't show image.
V4L2_CORE: (jpeg decoder) error while decoding frame
V4L2_CORE: (jpeg decoder) Ignoring empty buffer
V4L2_CORE: Error - Couldn't decode frame
VLC seems to use another driver AND DOES NOT SHOW issue.
DistroRelease: Ubuntu 17.10
Package: cheese 3.24.0-0ubuntu1
ProcVersionSignature: Ubuntu 4.11.0-10.15-generic 4.11.8
Uname: Linux 4.11.0-10-generic x86_64
Date: Sun Aug 6 12:15:28 2017
InstallationDate: Installed on 2017-04-01 (127 days ago)
InstallationMedia: Ubuntu 17.04 "Zesty Zapus" - Beta amd64 (20170331)
MachineType: Dell Inc. XPS 12-9Q33
PATH=(custom, no user)
cheese_camera_play () from /usr/lib/x86_64-linux-gnu/libcheese.so.8
g_closure_invoke () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
?? () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
g_signal_emit_valist () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
Title: cheese crashed with SIGFPE in cheese_camera_play()
UpgradeStatus: Upgraded to artful on 2017-06-08 (59 days ago)
UserGroups: adm cdrom dip lpadmin lxd plugdev sambashare sudo
dmi.bios.vendor: Dell Inc.
dmi.board.name: XPS 12-9Q33
dmi.board.vendor: Dell Inc.
dmi.chassis.vendor: Dell Inc.
dmi.chassis.version: Not Specified
dmi.product.name: XPS 12-9Q33
dmi.sys.vendor: Dell Inc.
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