Date: Mon, 20 Jul 2026 17:35:40 +0200 From: Baptiste Daroussin <bapt@FreeBSD.org> To: Nilton Jose Rizzo <rizzo@rizzo.eng.br> Cc: freebsd-current@freebsd.org Subject: Re: uvideo not wrok fine Message-ID: <al5AOl5MTxcoZ66d@b.nours.eu> In-Reply-To: <al4TI4T7VnM03WmN@b.nours.eu> References: <9fe285ad-e92c-468c-a3b1-4539acef7064@rizzo.eng.br> <22C82D84-9DA8-473F-88A9-7DAE88F234BD@nours.eu> <43193a69-cd0f-474a-9626-44421ad39316@rizzo.eng.br> <18807C4E-3294-4A9D-A8A4-B9D5989B8F79@nours.eu> <5f70832a-a9fc-4cc2-85c9-143690e56da1@rizzo.eng.br> <al4TI4T7VnM03WmN@b.nours.eu>
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On Mon 20 Jul 14:24, Baptiste Daroussin wrote: > On Sun 19 Jul 14:03, Nilton Jose Rizzo wrote: > > Em 19/07/2026 13:49, Baptiste Daroussin escreveu: > > > > > > Le 18 juillet 2026 23:45:58 GMT+02:00, Nilton Jose Rizzo<rizzo@rizzo.eng.br> a écrit : > > > > Em 18/07/2026 02:36, Baptiste Daroussin escreveu: > > > > > Le 14 juillet 2026 01:42:07 GMT+02:00, Nilton Jose Rizzo<rizzo@rizzo.eng.br> a écrit : > > > > > > Hi all, > > > > > > > > > > > > I upgraded my desktop last weekend and decided to try the new *uvideo*driver from OpenBSD. > > > > > > > > > > > > When I run |pwcview|, the image is displayed incorrectly: it is horizontally duplicated and shows interlaced lines. > > > > > > > > > > > > If I switch back to |webcamd|, the webcam works normally. > > > > > > > > > > > > I also tested it with *Google Meet*and *Jitsi Meet*in Firefox. > > > > > > > > > > > > On Google Meet, I receive a warning indicating that my webcam is not functioning properly. > > > > > > > > > > > > Has anyone experienced this issue or have any suggestions on how to troubleshoot it? > > > > > > > > > > > > My web cam is HD Pro C920 USB > > > > > > > > > > > > ugen0.2: <HD Pro Webcam C920 Logitech, Inc.> at usbus0, cfg=0 md=HOST spd=HIGH (480Mbps) pwr=ON (500mA) > > > > > > > > > > > > $ usbconfig -v -d ugen0.2 > > > > > > ugen0.2: <HD Pro Webcam C920 Logitech, Inc.> at usbus0, cfg=0 md=HOST spd=HIGH (480Mbps) pwr=ON (500mA) > > > > > > ugen0.2.2: uaudio0: <vendor 0x046d HD Pro Webcam C920, class 239/2, rev 2.00/0.11, addr 3> > > > > > > > > > > > > bLength = 0x0012 > > > > > > bDescriptorType = 0x0001 > > > > > > bcdUSB = 0x0200 > > > > > > bDeviceClass = 0x00ef <Miscellaneous device> > > > > > > bDeviceSubClass = 0x0002 > > > > > > bDeviceProtocol = 0x0001 > > > > > > bMaxPacketSize0 = 0x0040 > > > > > > idVendor = 0x046d > > > > > > idProduct = 0x082d > > > > > > bcdDevice = 0x0011 > > > > > > iManufacturer = 0x0000 <no string> > > > > > > iProduct = 0x0002 <HD Pro Webcam C920> > > > > > > iSerialNumber = 0x0001 <1BC69C1F> > > > > > > bNumConfigurations = 0x0001 > > > > > > > > > > > > When uvideo load, show this message > > > > > > > > > > > > uvideo0 on uhub1 > > > > > > uvideo0: <vendor 0x046d HD Pro Webcam C920, class 239/2, rev 2.00/0.11, addr 3> on usbus0 > > > > > > uvideo0: too many PU descriptors found! > > > > > > uvideo0: too many PU descriptors found! > > > > > > uvideo0: too many PU descriptors found! > > > > > > uvideo0: too many PU descriptors found! > > > > > > uvideo0: too many PU descriptors found! > > > > > > uvideo0: too many PU descriptors found! > > > > > > uvideo0: too many PU descriptors found! > > > > > > uvideo0: too many PU descriptors found! > > > > > > uvideo0: too many PU descriptors found! > > > > > > uvideo0: too many PU descriptors found! > > > > > > uvideo0: 3 format(s), iface_index=1, endpoint=0x81, psize=3060, isoc > > > > > > uvideo0: default format: pixfmt=0x56595559, 640x480, max_fbuf=4147200 > > > > > > uvideo0: UVC camera on /dev/video0 > > > > > > > > > > > > > > > > > try updating UVIDEO_MAX_PU and UVIDEO_MAX_CT from 8 to 32. > > > > > > > > > > in sys/dev/usb/video/uvideo.c > > > > > > > > > > best regards, > > > > > Bapt > > > > I change these values, PU warnings was gone. > > > > > > > > My Webcam not work fine yet. > > > > > > > > See this jpeg screenshot from pwcview using default values to fps and resolution (sif). > > > > > > > > https://imgur.com/a/YG89hK5 > > > > > > > > > > > > ugen0.2: <vendor 0x046d HD Pro Webcam C920> at usbus0 > > > > uvideo0 on uhub1 > > > > uvideo0: <vendor 0x046d HD Pro Webcam C920, class 239/2, rev 2.00/0.11, addr 3> on usbus0 > > > > uvideo0: 3 format(s), iface_index=1, endpoint=0x81, psize=3060, isoc > > > > uvideo0: default format: pixfmt=0x56595559, 640x480, max_fbuf=4147200 > > > > uvideo0: UVC camera on /dev/video0 > > > > uaudio0 on uhub1 > > > > uaudio0: <vendor 0x046d HD Pro Webcam C920, class 239/2, rev 2.00/0.11, addr 3> on usbus0 > > > > uaudio0: No playback. > > > > uaudio0: Record[0]: 32000 Hz, 2 ch, 16-bit S-LE PCM format, 2x4ms buffer. (selected) > > > > uaudio0: Record[0]: 24000 Hz, 2 ch, 16-bit S-LE PCM format, 2x4ms buffer. > > > > uaudio0: Record[0]: 16000 Hz, 2 ch, 16-bit S-LE PCM format, 2x4ms buffer. > > > > uaudio0: No MIDI sequencer. > > > > pcm6 on uaudio0 > > > > uaudio0: No HID volume keys found. > > > > uvideo0: stream open: nframes=51, psize=3060, maxVideoFrameSize=153600, maxPayloadSize=800, alt=11, isoc > > > > uvideo0: stream open: nframes=51, psize=3060, maxVideoFrameSize=153600, maxPayloadSize=800, alt=11, isoc > > > > > > > > > > > > > > > on linux it has quirks for this model, I need to implement some. I ll come back with a patch soon > > > > > > bapt > > > > I'd be happy to help improve this driver by providing more information about > > this camera. Let me know what information would be useful. > > > > Thank you Baptiste. > > > > -- > > ************************** > > * Dr. Nilton Jose Rizzo * > > * Engenheiro Eletrônico * > > * Doutor pela COPPE/UFRJ * > > * Telegram: @njrizzo * > > ************************** > > I have pushed the quirks infrastructure from openbsd, can you try the following > patch on top of it? this is quirks I found for your model in linux uvc driver: > > https://people.freebsd.org/~bapt/0001-uvideo-add-quirks-for-Logitech-C920-webcams.patch > > Best regards, > Bapt > Actually try this version of the patch: https://bapt.nours.eu/0001-uvideo-add-quirks-for-Logitech-C920-webcams.patch Best regards, Bapthome | help
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