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* [Bluez-devel] Jumpy cursor with Wacom Graphire Bluetooth
@ 2005-10-08 13:25 Robert Siemer
  2005-10-08 13:29 ` Marcel Holtmann
  2005-11-27 17:42 ` [Bluez-devel] " Robert Siemer
  0 siblings, 2 replies; 28+ messages in thread
From: Robert Siemer @ 2005-10-08 13:25 UTC (permalink / raw)
  To: bluez-devel

[-- Attachment #1: Type: text/plain, Size: 1712 bytes --]

Hello everybody!

hcidump is telling me that my tablet sends packets only after six pixels
of mouse movement or together with button events. - I suppose that some
parameters exchanged during connection handshake are the cause.

-Who is making the connectinon? (hidp kernel module?)
-Who can/could influence it's outcome? (hidd userspace daemon? Plays
 hcid an important role?)
-Has the latency thing something to do with it?
-Which spec should I first dig into - Bluetooth or HID?


I played already around with role switching (forced, voluntary from the
tablet, none). - Has no influence.

A "hcidump -w" connection dumps are attached. Here inline some tablet
mouse movements:

panorama:/tmp# hcidump -V -X
HCI sniffer - Bluetooth packet analyzer ver 1.23
device: hci0 snap_len: 1028 filter: 0xffffffff
> ACL data: handle 41 flags 0x02 dlen 10
    L2CAP(d): cid 0x0041 len 6 [psm 0]
      0000: a1 02 00 fa 02 00                                 ......
                     ^^ ^^
Curser moved six "entities" to the left. While already sending a packet,
the tablet also reports some down movements ("02").

> ACL data: handle 41 flags 0x02 dlen 13
    L2CAP(d): cid 0x0041 len 9 [psm 0]
      0000: a1 03 00 00 00 00 00 00  20                       ........ 
> ACL data: handle 41 flags 0x02 dlen 10
    L2CAP(d): cid 0x0041 len 6 [psm 0]
      0000: a1 02 00 fd 06 00                                 ......
                     ^^ ^^
The same, but moved 06 entities ("pixel") down. Obviously I also moved 3
pixels left (0xfd).

> ACL data: handle 41 flags 0x02 dlen 13
    L2CAP(d): cid 0x0041 len 9 [psm 0]
      0000: a1 03 00 00 00 00 00 00  20                       ........ 



Thanks for comments!

Robert

[-- Attachment #2: hcidump.connect.bin --]
[-- Type: application/octet-stream, Size: 1513 bytes --]

[-- Attachment #3: hcidump.connect_no_rswitch.bin --]
[-- Type: application/octet-stream, Size: 1352 bytes --]

[-- Attachment #4: hcidump.connect_voluntary_rswitch.bin --]
[-- Type: application/octet-stream, Size: 1611 bytes --]

^ permalink raw reply	[flat|nested] 28+ messages in thread

end of thread, other threads:[~2005-11-28 10:29 UTC | newest]

Thread overview: 28+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2005-10-08 13:25 [Bluez-devel] Jumpy cursor with Wacom Graphire Bluetooth Robert Siemer
2005-10-08 13:29 ` Marcel Holtmann
2005-10-08 14:23   ` Robert Siemer
2005-10-08 15:01     ` Marcel Holtmann
2005-10-08 16:30       ` Robert Siemer
2005-10-08 17:28       ` Dimitry Andric
2005-11-27 17:42 ` [Bluez-devel] " Robert Siemer
2005-11-27 18:26   ` Marcel Holtmann
2005-11-27 18:49     ` Robert Siemer
2005-11-27 19:26       ` Marcel Holtmann
2005-11-27 21:38         ` Robert Siemer
2005-11-27 21:56           ` Marcel Holtmann
2005-11-27 23:04             ` Robert Siemer
2005-11-27 23:11               ` Marcel Holtmann
2005-11-27 23:49                 ` Robert Siemer
2005-11-28  0:02                   ` Marcel Holtmann
2005-11-28  1:53                     ` Robert Siemer
2005-11-28  2:08                       ` Marcel Holtmann
2005-11-28  2:29                         ` Robert Siemer
2005-11-28  2:57                           ` Marcel Holtmann
2005-11-28  8:44                             ` Robert Siemer
2005-11-28  9:00                               ` Marcel Holtmann
2005-11-28  9:21                                 ` Robert Siemer
2005-11-28  9:36                                   ` Marcel Holtmann
2005-11-28 10:22                                     ` Robert Siemer
2005-11-28 10:29                                       ` Marcel Holtmann
2005-11-27 23:13               ` Robert Siemer
2005-11-27 21:24     ` Robert Siemer

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