Confirmed that with v4l2loopback-dkms 0.12.3-1ubuntu0.1, configured
devices are not correctly advertised. This breaks Zoom, Cheese, etc.
Compiling v4l2loopback from upstream source works correctly.
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Right now, the only app that appears to work with the new module is
Chromium. Which was where I was testing because that seemed more
demanding. Will be working on the regression on bug 1901491.
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Can confirm, this change prevents Zoom from listing my v4l2lsink from
OBS. I had to downgrade to the "base" package so that my co-workers can
continue to see my stupid effects and overlays.
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No, looking quickly at the code that should be set in the capabilities
returned by the query capabilities call. But not in the static
device_caps. And if that is added back, one cannot drop that flag for
exclusive_caps functionality without triggering repeated kernel
warnings.
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Would loading the new module with exclusive_caps=1 work as a quick work-
around. I guess I missed adding the caps explicitly in the query
function. So that relies on thing being set as device caps.
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The last fix also broke v4l2loopback for me. Most applications seem to
check the V4L2_CAP_VIDEO_CAPTURE flag (eg Firefox:
https://hg.mozilla.org/releases/mozilla-
release/file/aac9479c6a32ce3b95556da24f3b00c00e145506/media/webrtc/trunk/webrtc/modules/video_capture/linux/device_info_linux.cc#l386),
This fix has rendered v4l2loopback obsolete. Indeed, the device is no longer
detected by any applications (e.g. VLC, Firefox, etc.).
I had to revert to the previous version to be able to use it again.
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This bug was fixed in the package v4l2loopback - 0.12.3-1ubuntu0.1
---
v4l2loopback (0.12.3-1ubuntu0.1) focal; urgency=medium
* Fix kernel warnings triggered by vidioc_querycap (LP: #1899633).
-- Stefan Bader Tue, 13 Oct 2020 15:07:55
+0200
** Changed in: v4l2loopback (Ubuntu
$ dpkg -l|grep v4l2loop
ii v4l2loopback-dkms 0.12.3-1ubuntu0.1
all Source for the v4l2loopback driver (DKMS)
ii v4l2loopback-utils 0.12.3-1ubuntu0.1
all Commandline utilities for
Hello Stefan, or anyone else affected,
Accepted v4l2loopback into focal-proposed. The package will build now
and be available at
https://launchpad.net/ubuntu/+source/v4l2loopback/0.12.3-1ubuntu0.1 in a
few hours, and then in the -proposed repository.
Please help us by testing this new package.
Thanks for the updated debdiff as requested, LGTM now.
Some minor cleanup 0.12.3-1ubuntu1 -> 0.12.3-1ubuntu0.1
Further I think we should add DKMS rebuild with the Focal kernel as
test-step explicitly (it will be done on install of the upgrade anyway,
but to be formally correct)
** Description
FYI: I was on the receiving end of a video call using this updated
driver - I can confirm it works.
Reviewed, made some minor fixups (version as mentioned), extended the
SRU template n the description and sponsored into Focal-proposed
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The kernel check was added in [1] v5.4-rc1 by:
Author: Hans Verkuil
Date: Tue Jul 23 04:21:25 2019 -0400
media: v4l2-dev/ioctl: require non-zero device_caps, verify sane querycap
results
Now that all V4L2 drivers set device_caps in struct video_device, we can add
a check for
Test build uploaded to:
https://launchpad.net/~smb/+archive/ubuntu/focal/+packages
The attached debdiff contains the proposed adjustments to the DKMS
package.
** Patch added: "focal-proposed-fix.debdiff"
The 20.10 version (0.12.5-1) was reworked considerably and I was told by
someone else that it would not exhibit those warnings.
** Changed in: v4l2loopback (Ubuntu)
Status: In Progress => Fix Released
** Changed in: v4l2loopback (Ubuntu)
Assignee: Stefan Bader (smb) => (unassigned)
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