Hi!
Automatic detection of BYD touchpads was sadly disabled at the end of
last year. They can be still be used by forcing the protocol manually as
described by Kai-Heng Feng above.
The reason for disabling detection was that the detection code generated
false positives with normal PS/2 mice
Yep - I changed the bug status to "Fix committed" which I think makes
the most sense - it's committed upstream but as you say won't be fixed
properly in Ubuntu until they update to a newer kernel version (or
backport it).
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A driver for this has been added upstream - see Linux kernel commits
98ee377144935857d8ad5d7d70cdab1da4ede32e and
98ee377144935857d8ad5d7d70cdab1da4ede32e.
** Changed in: linux (Ubuntu)
Status: Triaged => Fix Committed
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Ok, so I've managed to write a kernel driver, as an extension to
psmouse, which recognises the touchpad and puts it into gesture-enabled
mode. Currently it recognises and uses vertical and horizontal two
finger scrolling, and also knows about the other gestures (but I haven't
got around to
*previous comment continued.
Gesture recognition is done by the touchpad and not the driver, and it's
not very good. I.e., it reports the gesture, not the finger positions,
so we can't configure things like scroll threshold.
The way to improve this would be to somehow put it in 'absolute' mode,
Using the technique here: http://blog.forshee.me/2011/11/touchpad-
protocol-reverse-engineering.html (with Qemu - I couldn't get it to work
under VBox), I have obtained a trace of the interaction between Windows
driver and touchpad on Windows 7 with all features working (two finger
scrolling,
** Attachment added: Qemu 2.2.0's hw/input/ps2.c, modified to dump data
from/to the touchpad
https://bugs.launchpad.net/ubuntu/+source/linux-lts-utopic/+bug/1424293/+attachment/4328778/+files/ps2.c
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Packages, which is
** Attachment added: A trace of the sent and received bytes between BYD
touchpad and windows driver running in Qemu.
https://bugs.launchpad.net/ubuntu/+source/linux-lts-utopic/+bug/1424293/+attachment/4328779/+files/example_trace_w7_qemu.txt
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