Bug 210767

Summary:	uvcvideo: Webcam (1f3a:100e) stopped working after 8a652a17e3c005dcdae31b6c8fdf14382a29cbbe
Product:	Drivers	Reporter:	Till Dörges (doerges)
Component:	USB	Assignee:	Default virtual assignee for Drivers/USB (drivers_usb)
Status:	NEW ---
Severity:	normal	CC:	laurent.pinchart+bugzilla-kernel, mchehab, tiwai
Priority:	P1
Hardware:	x86-64
OS:	Linux
Kernel Version:	5.10.1-2.g8f3d468	Subsystem:
Regression:	Yes	Bisected commit-id:
Attachments:	Output from lsusb as root Tentative patch

Description Till Dörges 2020-12-18 11:40:43 UTC

The device in question is

  Renkforce RF AC4K 300 Action Cam 4K

https://www.conrad.de/de/p/action-cam-renkforce-rf-ac-4k-webcam-4k-wlan-wasserfest-staubgeschuetzt-1577043.html


When connected via USB to a PC, it offers two modes:
 - mass storage
 - camera


When set to webcam mode it identifies as:
  [34367.545510] uvcvideo: Found UVC 1.00 device Android (1f3a:100e)


I tested against 5.10.1-2.g8f3d468.


With 8a652a17e3c005dcdae31b6c8fdf14382a29cbbe (https://raw.githubusercontent.com/SUSE/kernel-source/openSUSE-15.2/patches.suse/media-uvcvideo-Ensure-all-probed-info-is-returned-to.patch) the device stopped working in camera mode, i.e. no more video capture.


When reversing the above patch, the device is working as expected.


Downstream bug report is at https://bugzilla.opensuse.org/show_bug.cgi?id=1180117

Comment 1 Laurent Pinchart 2020-12-18 14:02:44 UTC

Could you please provide the output of

lsusb -v -d 1f3a:100e

(if possible running as root) ?

Comment 2 Till Dörges 2020-12-19 19:51:15 UTC

Created attachment 294237 [details]
Output from lsusb as root

Comment 3 Till Dörges 2020-12-20 11:55:58 UTC

The device also seems to have issues with USB suspend (https://sourceforge.net/p/linux-uvc/mailman/message/37178728/)

Is this in any way related?

Comment 4 Laurent Pinchart 2020-12-20 14:26:20 UTC

Thank you for the lsusb output.

The problem is caused by a bug in the device firmware, so we'll need to work around it. I'll propose a patch.

Comment 5 Laurent Pinchart 2020-12-20 14:27:30 UTC

Created attachment 294241 [details]
Tentative patch

Comment 6 Laurent Pinchart 2020-12-20 14:29:25 UTC

Assuming the patch fixes the issue, I'll submit it to the linux-media mailing list. Till, are you OK to have your name included in the commit messages as the reporter ?

Comment 7 Till Dörges 2020-12-20 16:26:27 UTC

(In reply to Laurent Pinchart from comment #6)

> Assuming the patch fixes the issue, I'll submit it to the linux-media
> mailing list.

Will try to give the patch a shot asap.


> Till, are you OK to have your name included in the commit
> messages as the reporter ?

Yes, including my name is okay.

Thanks for the quick turnaround!

Comment 8 Till Dörges 2020-12-20 16:42:24 UTC

Tests were against 5.10.1-2.g8f3d468.

I applied the patch from comment 5 (0001-media-uvcvideo-Accept-invalid-bFormatIndex-and-bFram.patch).

The device is working as expected with that patch.

Thanks!