Hi Kieran, On Wed, 11 Apr 2018, Kieran Bingham wrote: > Hi Guennadi, > > On 11/04/18 17:17, Kieran Bingham wrote: > > Hi Guennadi, > > > > On 11/04/18 10:56, Guennadi Liakhovetski wrote: > >> Hi Laurent, > >> > >> Not sure whether that's a kernel or a user-space problem, but UVC related > >> anyway. I've got a UVC 1.5 (!) Logitech camera, that used to work fine > >> with earlier kernels. I now installed "media 4.16" and saw, that the > >> kernel log was filling with messages like > >> > >> uvcvideo: Failed to query (GET_MIN) UVC control 2 on unit 1: -32 (exp. 1). > >> > >> The expected /dev/video[01] nodes were not created correctly, and the > >> hard-drive was getting full very quickly. The latter was happening because > >> the the /var/log/uvcdynctrl-udev.log file was growing. A truncated sample > >> is attached. At its bottom you see messages > >> > >> [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. > >> > >> repeating, which continues even if the camera is unplugged. The kernel is > >> the head of the master branch of git://linuxtv.org/media_tree.git > >> > >> Just figured out this commit > >> > >> From: Edgar Thier <info@xxxxxxxxxxxxxx> > >> Date: Thu, 12 Oct 2017 03:54:17 -0400 > >> Subject: [PATCH] media: uvcvideo: Apply flags from device to actual properties > >> > >> as the culprit. Without it everything is back to normal. > > > > I've already investigated and fixed this: > > > > Please apply: > > https://patchwork.kernel.org/patch/10299735/ Great, thanks! That seems to fix my problem. Regards Guennadi > > > > You stated that this is showing up on a v4.16 kernel ... but as far as I'm aware > > - this feature shouldn't make it in until v4.17. Are you using linux-next or a > > media/master or such ? > > Aha - never mind - I just re-read your message. > > I expect the fix to make it into the media mainline when Mauro pulls from > Laurent? So I'm sure it will find its way soon. > > -- > Cheers > > Kieran > > > > > > Regards > > > > Kieran > > > >> Thanks > >> Guennadi > >> >
