Re: webcamd based touchscreen problem on Pi3

Hans Petter Selasky Fri, 09 Mar 2018 00:43:07 -0800

On 03/09/18 01:44, Bernd Walter wrote:

On Thu, Mar 08, 2018 at 10:10:47PM +0100, Hans Petter Selasky wrote:

You can try running usbdump to capture USB packets.


ktrace is also your friend.

dd if=/dev/input/event0 bs=1

Also check ownership of devices, that X.org can read from them.


It happens earlier, /dev/input/event0 delivers nothing at all.
But usbdump is interesting.
I've booted with webcamd disabled, started usbdump and started webcamd.

This is what I get:
[22]sa# usbdump -v -f 4
00:30:09.379930 usbus0.4 SUBM-CTRL-EP=00000080,SPD=FULL,NFR=2,SLEN=8,IVAL=0
  frame[0] WRITE 8 bytes
  0000  80 06 00 03 00 00 04 00  -- -- -- -- -- -- -- --  |........        |
  frame[1] READ 4 bytes
00:30:09.382401 usbus0.4 
DONE-CTRL-EP=00000080,SPD=FULL,NFR=2,SLEN=4,IVAL=0,ERR=0
  frame[0] WRITE 8 bytes
  frame[1] READ 4 bytes
  0000  04 03 09 04 -- -- -- --  -- -- -- -- -- -- -- --  |....            |
00:30:09.382448 usbus0.4 SUBM-CTRL-EP=00000080,SPD=FULL,NFR=2,SLEN=8,IVAL=0
  frame[0] WRITE 8 bytes
  0000  80 06 00 03 00 00 04 00  -- -- -- -- -- -- -- --  |........        |
  frame[1] READ 4 bytes
00:30:09.385398 usbus0.4 
DONE-CTRL-EP=00000080,SPD=FULL,NFR=2,SLEN=4,IVAL=0,ERR=0
  frame[0] WRITE 8 bytes
  frame[1] READ 4 bytes
  0000  04 03 09 04 -- -- -- --  -- -- -- -- -- -- -- --  |....            |
00:30:09.385439 usbus0.4 SUBM-CTRL-EP=00000080,SPD=FULL,NFR=2,SLEN=8,IVAL=0
  frame[0] WRITE 8 bytes
  0000  80 06 02 03 09 04 04 00  -- -- -- -- -- -- -- --  |........        |
  frame[1] READ 4 bytes
00:30:09.388398 usbus0.4 
DONE-CTRL-EP=00000080,SPD=FULL,NFR=2,SLEN=4,IVAL=0,ERR=0
  frame[0] WRITE 8 bytes
  frame[1] READ 4 bytes
  0000  12 03 42 00 -- -- -- --  -- -- -- -- -- -- -- --  |..B.            |
00:30:09.388434 usbus0.4 SUBM-CTRL-EP=00000080,SPD=FULL,NFR=2,SLEN=8,IVAL=0
  frame[0] WRITE 8 bytes
  0000  80 06 02 03 09 04 12 00  -- -- -- -- -- -- -- --  |........        |
  frame[1] READ 18 bytes
00:30:09.391399 usbus0.4 
DONE-CTRL-EP=00000080,SPD=FULL,NFR=2,SLEN=20,IVAL=0,ERR=0
  frame[0] WRITE 8 bytes
  frame[1] READ 18 bytes
  0000  12 03 42 00 79 00 20 00  5A 00 48 00 38 00 35 00  |..B.y. .Z.H.8.5.|
  0010  31 00 -- -- -- -- -- --  -- -- -- -- -- -- -- --  |1.              |
00:30:09.391474 usbus0.4 SUBM-CTRL-EP=00000080,SPD=FULL,NFR=2,SLEN=8,IVAL=0
  frame[0] WRITE 8 bytes
  0000  80 06 00 03 00 00 04 00  -- -- -- -- -- -- -- --  |........        |
  frame[1] READ 4 bytes
00:30:09.394398 usbus0.4 
DONE-CTRL-EP=00000080,SPD=FULL,NFR=2,SLEN=4,IVAL=0,ERR=0
  frame[0] WRITE 8 bytes
  frame[1] READ 4 bytes
  0000  04 03 09 04 -- -- -- --  -- -- -- -- -- -- -- --  |....            |
00:30:09.394435 usbus0.4 SUBM-CTRL-EP=00000080,SPD=FULL,NFR=2,SLEN=8,IVAL=0
  frame[0] WRITE 8 bytes
  0000  80 06 00 03 00 00 04 00  -- -- -- -- -- -- -- --  |........        |
  frame[1] READ 4 bytes
00:30:09.397398 usbus0.4 
DONE-CTRL-EP=00000080,SPD=FULL,NFR=2,SLEN=4,IVAL=0,ERR=0
  frame[0] WRITE 8 bytes
  frame[1] READ 4 bytes
  0000  04 03 09 04 -- -- -- --  -- -- -- -- -- -- -- --  |....            |
00:30:09.397436 usbus0.4 SUBM-CTRL-EP=00000080,SPD=FULL,NFR=2,SLEN=8,IVAL=0
  frame[0] WRITE 8 bytes
  0000  80 06 01 03 09 04 04 00  -- -- -- -- -- -- -- --  |........        |
  frame[1] READ 4 bytes
00:30:09.400398 usbus0.4 
DONE-CTRL-EP=00000080,SPD=FULL,NFR=2,SLEN=4,IVAL=0,ERR=0
  frame[0] WRITE 8 bytes
  frame[1] READ 4 bytes
  0000  14 03 42 00 -- -- -- --  -- -- -- -- -- -- -- --  |..B.            |
00:30:09.400433 usbus0.4 SUBM-CTRL-EP=00000080,SPD=FULL,NFR=2,SLEN=8,IVAL=0
  frame[0] WRITE 8 bytes
  0000  80 06 01 03 09 04 14 00  -- -- -- -- -- -- -- --  |........        |
  frame[1] READ 20 bytes
00:30:09.403398 usbus0.4 
DONE-CTRL-EP=00000080,SPD=FULL,NFR=2,SLEN=20,IVAL=0,ERR=0
  frame[0] WRITE 8 bytes
  frame[1] READ 20 bytes
   0000  14 03 42 00 59 00 5A 00  48 00 59 00 59 00 5A 00  |..B.Y.Z.H.Y.Y.Z.|
  0010  48 00 59 00 -- -- -- --  -- -- -- -- -- -- -- --  |H.Y.            |
00:30:09.403440 usbus0.4 SUBM-CTRL-EP=00000080,SPD=FULL,NFR=2,SLEN=8,IVAL=0
  frame[0] WRITE 8 bytes
  0000  80 06 00 03 00 00 04 00  -- -- -- -- -- -- -- --  |........        |
  frame[1] READ 4 bytes
00:30:09.406398 usbus0.4 
DONE-CTRL-EP=00000080,SPD=FULL,NFR=2,SLEN=4,IVAL=0,ERR=0
  frame[0] WRITE 8 bytes
  frame[1] READ 4 bytes
  0000  04 03 09 04 -- -- -- --  -- -- -- -- -- -- -- --  |....            |
00:30:09.406437 usbus0.4 SUBM-CTRL-EP=00000080,SPD=FULL,NFR=2,SLEN=8,IVAL=0
  frame[0] WRITE 8 bytes
  0000  80 06 00 03 00 00 04 00  -- -- -- -- -- -- -- --  |........        |
  frame[1] READ 4 bytes
00:30:09.409397 usbus0.4 
DONE-CTRL-EP=00000080,SPD=FULL,NFR=2,SLEN=4,IVAL=0,ERR=0
  frame[0] WRITE 8 bytes
  frame[1] READ 4 bytes
  0000  04 03 09 04 -- -- -- --  -- -- -- -- -- -- -- --  |....            |
00:30:09.409434 usbus0.4 SUBM-CTRL-EP=00000080,SPD=FULL,NFR=2,SLEN=8,IVAL=0
  frame[0] WRITE 8 bytes
  0000  80 06 03 03 09 04 04 00  -- -- -- -- -- -- -- --  |........        |
  frame[1] READ 4 bytes
00:30:09.412398 usbus0.4 
DONE-CTRL-EP=00000080,SPD=FULL,NFR=2,SLEN=4,IVAL=0,ERR=0
  frame[0] WRITE 8 bytes
  frame[1] READ 4 bytes
  0000  1A 03 1A 00 -- -- -- --  -- -- -- -- -- -- -- --  |....            |
00:30:09.412434 usbus0.4 SUBM-CTRL-EP=00000080,SPD=FULL,NFR=2,SLEN=8,IVAL=0
  frame[0] WRITE 8 bytes
  0000  80 06 03 03 09 04 1A 00  -- -- -- -- -- -- -- --  |........        |
  frame[1] READ 26 bytes
00:30:09.415398 usbus0.4 
DONE-CTRL-EP=00000080,SPD=FULL,NFR=2,SLEN=28,IVAL=0,ERR=0
  frame[0] WRITE 8 bytes
  frame[1] READ 26 bytes
  0000  1A 03 1A 00 95 00 50 00  33 00 39 00 31 00 31 00  |......P.3.9.1.1.|
  0010  06 00 32 00 33 00 39 00  38 00 -- -- -- -- -- --  |..2.3.9.8.      |
00:30:09.420243 usbus0.4 SUBM-CTRL-EP=00000080,SPD=FULL,NFR=2,SLEN=8,IVAL=0
  frame[0] WRITE 8 bytes
  0000  80 06 00 03 00 00 04 00  -- -- -- -- -- -- -- --  |........        |
  frame[1] READ 4 bytes
00:30:09.422400 usbus0.4 
DONE-CTRL-EP=00000080,SPD=FULL,NFR=2,SLEN=4,IVAL=0,ERR=0
  frame[0] WRITE 8 bytes
  frame[1] READ 4 bytes
  0000  04 03 09 04 -- -- -- --  -- -- -- -- -- -- -- --  |....            |
00:30:09.422441 usbus0.4 SUBM-CTRL-EP=00000080,SPD=FULL,NFR=2,SLEN=8,IVAL=0
  frame[0] WRITE 8 bytes
  0000  80 06 00 03 00 00 04 00  -- -- -- -- -- -- -- --  |........        |
  frame[1] READ 4 bytes
00:30:09.425398 usbus0.4 
DONE-CTRL-EP=00000080,SPD=FULL,NFR=2,SLEN=4,IVAL=0,ERR=0
  frame[0] WRITE 8 bytes
  frame[1] READ 4 bytes
  0000  04 03 09 04 -- -- -- --  -- -- -- -- -- -- -- --  |....            |
00:30:09.425436 usbus0.4 SUBM-CTRL-EP=00000080,SPD=FULL,NFR=2,SLEN=8,IVAL=0
  frame[0] WRITE 8 bytes
  0000  80 06 03 03 09 04 04 00  -- -- -- -- -- -- -- --  |........        |
  frame[1] READ 4 bytes
00:30:09.428398 usbus0.4 
DONE-CTRL-EP=00000080,SPD=FULL,NFR=2,SLEN=4,IVAL=0,ERR=0
  frame[0] WRITE 8 bytes
  frame[1] READ 4 bytes
  0000  1A 03 1A 00 -- -- -- --  -- -- -- -- -- -- -- --  |....            |
00:30:09.428436 usbus0.4 SUBM-CTRL-EP=00000080,SPD=FULL,NFR=2,SLEN=8,IVAL=0
  frame[0] WRITE 8 bytes
  0000  80 06 03 03 09 04 1A 00  -- -- -- -- -- -- -- --  |........        |
  frame[1] READ 26 bytes
00:30:09.431398 usbus0.4 
DONE-CTRL-EP=00000080,SPD=FULL,NFR=2,SLEN=28,IVAL=0,ERR=0
  frame[0] WRITE 8 bytes
  frame[1] READ 26 bytes
  0000  1A 03 1A 00 95 00 50 00  33 00 39 00 31 00 31 00  |......P.3.9.1.1.|
  0010  06 00 32 00 33 00 39 00  38 00 -- -- -- -- -- --  |..2.3.9.8.      |
00:30:09.431941 usbus0.4 SUBM-CTRL-EP=00000000,SPD=FULL,NFR=1,SLEN=8,IVAL=0
  frame[0] WRITE 8 bytes
  0000  21 0A 00 00 00 00 00 00  -- -- -- -- -- -- -- --  |!.......        |
00:30:09.433396 usbus0.4 
DONE-CTRL-EP=00000000,SPD=FULL,NFR=1,SLEN=0,IVAL=0,ERR=STALLED
  frame[0] WRITE 8 bytes
00:30:09.433442 usbus0.4 SUBM-CTRL-EP=00000080,SPD=FULL,NFR=2,SLEN=8,IVAL=0
  frame[0] WRITE 8 bytes
  0000  81 06 00 22 00 00 FB 00  -- -- -- -- -- -- -- --  |..."....        |
  frame[1] READ 251 bytes
00:30:09.439403 usbus0.4 
DONE-CTRL-EP=00000080,SPD=FULL,NFR=2,SLEN=252,IVAL=0,ERR=0
  frame[0] WRITE 8 bytes
  frame[1] READ 251 bytes
00:30:09.447376 usbus0.4 SUBM-CTRL-EP=00000080,SPD=FULL,NFR=2,SLEN=8,IVAL=0
  frame[0] WRITE 8 bytes
  0000  A1 01 02 03 00 00 02 00  -- -- -- -- -- -- -- --  |........        |
  frame[1] READ 2 bytes
00:30:09.450400 usbus0.4 
DONE-CTRL-EP=00000080,SPD=FULL,NFR=2,SLEN=4,IVAL=0,ERR=0
  frame[0] WRITE 8 bytes
  frame[1] READ 2 bytes
  0000  02 0A -- -- -- -- -- --  -- -- -- -- -- -- -- --  |..              |
00:30:09.451878 usbus0.4 SUBM-CTRL-EP=00000000,SPD=FULL,NFR=2,SLEN=12,IVAL=0
  frame[0] WRITE 8 bytes
  0000  21 09 03 03 00 00 03 00  -- -- -- -- -- -- -- --  |!.......        |
  frame[1] WRITE 3 bytes
  0000  03 02 00 -- -- -- -- --  -- -- -- -- -- -- -- --  |...             |
00:30:09.454404 usbus0.4 
DONE-CTRL-EP=00000000,SPD=FULL,NFR=2,SLEN=0,IVAL=0,ERR=0
  frame[0] WRITE 8 bytes
  frame[1] WRITE 3 bytes
00:30:09.466235 usbus0.4 SUBM-INTR-EP=00000082,SPD=FULL,NFR=1,SLEN=0,IVAL=10
  frame[0] READ 14 bytes
00:30:09.523430 usbus0.4 
DONE-INTR-EP=00000082,SPD=FULL,NFR=0,SLEN=0,IVAL=10,ERR=CANCELLED

It is obvious that the communication fails very early.


Can you try connecting the device through an external USB HUB?

Can you capture the whole enumeration sequence. Can you also try settingthe UQ_NO_STRINGS quirk using usbconfig for this device and re-plug it?


--HPS

--HPS
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Re: webcamd based touchscreen problem on Pi3

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