Re: webcamd based touchscreen problem on Pi3

From: Bernd Walter <>
Date: Sat, 10 Mar 2018 01:03:39 +0100
On Fri, Mar 09, 2018 at 02:25:39PM +0100, Bernd Walter wrote:
> On Fri, Mar 09, 2018 at 01:19:54PM +0100, Hans Petter Selasky wrote:
> > On 03/09/18 12:40, Bernd Walter wrote:
> > >Will do the quirk test later.
> > 
> > I don't see any stalls during plug-in, so it might be a request webcamd 
> > issues, which the device doesn't support. Try building webcamd with 
> > debug support.
> It is already build with debug.
> But I don't see anything of special interest in the output.
> [24]sa# webcamd -d ugen0.4
> Linux video capture interface: v2.00
> IR NEC protocol handler initialized
> IR RC5(x/sz) protocol handler initialized
> IR RC6 protocol handler initialized
> IR JVC protocol handler initialized
> IR Sony protocol handler initialized
> IR SANYO protocol handler initialized
> IR LIRC bridge handler initialized
> IR XMP protocol handler initialized
> b2c2-flexcop: B2C2 FlexcopII/II(b)/III digital TV receiver chip loaded successfully
> USB Video Class driver (1.1.1)
> cpia2: V4L-Driver for Vision CPiA2 based cameras v3.0.1
> pvrusb2: V4L in-tree version:Hauppauge WinTV-PVR-USB2 MPEG2 Encoder/Tuner
> pvrusb2: Debug mask is 31 (0x1f)
> USBVision USB Video Device Driver for Linux : 0.9.11
> Attached to ugen0.4[0]
> INFO: 0003:0EEF:0005.0001: input: USB HID v1.10 Mouse [BYZHYYZHY By ZH851] on usb-/dev/usb-/dev/usb/input0
> DBG: 0003:0EEF:0005.0001: Kicking head 1 tail 0
> Creating /dev/input/event0
> I will redo a test with raspbian.
> Waveshare delivered a binary kernel (so much about GPL) for their 7" HDMI C
> until they changed something in the device firmware and upgraded for a newer
> panel about 2-3 years ago.
> This is the 10.1" HMDI B and it is a very early version I have, which however
> should use a firmware similar to the newer 7" HDMI C.
> I will retest with a stock Raspbian image to be sure I wasn't accidently
> using a Waveshare image back then.
> As far as I can see the Linux drivers just quirk the device to the egalaxy
> driver, so they do know the Waveshare by ID.
> I couldn't spot a difference between Linux and what is included in the webcamd
> source.

So the older 7" HDMI C Rev 1.1 with the non IPS panel won't even attach, but
it always needed some special binary support for Linux, no surprises here.
The newer Rev 2.1 with the IPS panel claims to be the same and work with
webcamd, at least I get data via /dev/input/event0, which looks reasonable
with evdev-dump.
That's an interesting starting point.

B.Walter <>
Modbus/TCP Ethernet I/O Baugruppen, ARM basierte FreeBSD Rechner uvm.
Received on Fri Mar 09 2018 - 23:03:49 UTC

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