Bug#733094: fills disk writing to /var/log/uvcdynctrl-udev.log

Daniel Pocock

unread,

Dec 25, 2013, 7:30:02 AM12/25/13

to

Package: uvcdynctrl
Version: 0.2.2-1

I discovered /var filled up after connecting a Logitech B990 webcam

This log file had appeared and grown to several gigabytes very quickly:

/var/log/uvcdynctrl-udev.log

with the message below repeated many times.

fuser tells me that this process is responsible for the ballooning logfile:

uvcdynctrl -d /dev/video0 --addctrl=046d:0828

[libwebcam] Warning: The driver behind device video0 has a slightly
buggy implementation
of the V4L2_CTRL_FLAG_NEXT_CTRL flag. It does not return the next higher
control ID if a control query fails. A workaround has been enabled.
[libwebcam] Warning: The driver behind device video0 has a slightly
buggy implementation
of the V4L2_CTRL_FLAG_NEXT_CTRL flag. It does not return the next higher
control ID if a control query fails. A workaround has been enabled.
[libwebcam] Warning: The driver behind device video0 has a slightly
buggy implementation
of the V4L2_CTRL_FLAG_NEXT_CTRL flag. It does not return the next higher
control ID if a control query fails. A workaround has been enabled.
[libwebcam] Warning: The driver behind device video0 has a slightly
buggy implementation
of the V4L2_CTRL_FLAG_NEXT_CTRL flag. It does not return the next higher
control ID if a control query fails. A workaround has been enabled.

--
To UNSUBSCRIBE, email to debian-bugs-...@lists.debian.org
with a subject of "unsubscribe". Trouble? Contact listm...@lists.debian.org

Paulo Assis

unread,

Dec 27, 2013, 6:10:01 AM12/27/13

to

Hi, this should be now fix in git.
You just need to set debug to 0 in /lib/udev/uvcdynctrl,
another option if you want to keep the debug messages is to rotate the log file.

Regards,
Paulo

2013/12/25 Daniel Pocock <dan...@pocock.com.au>:

Sam Morris

unread,

Apr 19, 2020, 10:30:04 AM4/19/20

to

severity 733094 serious
thanks

I just had to rescue a system that had four instances of uvcdynctrl
pegging the CPU to 100% and a full disk (that now prevents gdm from
giving the user a login screen). The log file is full of the same
messages regarding the driver having a slightly buggy implementation.

--
Sam Morris <s...@robots.org.uk>

Kurt Meyer

unread,

Dec 7, 2021, 11:20:03 PM12/7/21

to

"Guvcview doesn't depend upon uvcdynctrl it just recommends it." Okay, but unless you disable "recommends", uvcdynctrl gets installed. Based on a little bit of research I performed, it is not recommended to disable "recommends" because recommended packages are usually needed for a more useful installation.

Source of info for not disabling "recommends":

https://unix.stackexchange.com/questions/122289/why-install-recommends-default-is-true

Does guvcview function or function well enough without uvcdynctrl?

The following additional packages will be installed:

libguvcview-2.0-2 libportaudio2 libwebcam0 uvcdynctrl uvcdynctrl-data

The following NEW packages will be installed:

guvcview libguvcview-2.0-2 libportaudio2 libwebcam0 uvcdynctrl uvcdynctrl-data

0 upgraded, 6 newly installed, 0 to remove and 0 not upgraded.

Need to get 266 kB/386 kB of archives.

After this operation, 1,437 kB of additional disk space will be used.

Kurt Meyer

unread,

Dec 8, 2021, 9:30:03 AM12/8/21

to

Thank you Paulo.

On Wed, Dec 8, 2021, at 05:57, Paulo Assis wrote:

Guvcview functions perfectly without uvcdynctrl.
uvcdynctrl just adds some exotic uvc ctrls for older logitech cameras, like a led ctrl.
The recommend can be droped without any problem.

Regards.

karsten

unread,

Jan 28, 2022, 10:20:04 AM1/28/22

to

I have the same problem here with Debian 11 (bullseye).

The only solution seems to be
apt-get purge uvcdynctrl

After that my webcam still works.
So this package can be seen as unusable, harmful and dispensable.
This should not be installed and all dependencies snatched.

Best regards
karsten