>Number:         188829
>Category:       usb
>Synopsis:       atp fails on Macbook Pro 4.1
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    freebsd-usb
>State:          open
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Sun Apr 20 16:10:00 UTC 2014
>Originator:     Roberto de Iriarte
>Release:        10.0-STABLE
De Iriarte
FreeBSD mbp 10.0-STABLE FreeBSD 10.0-STABLE #13 r264692M: Sun Apr 20 12:14:28 
CLST 2014     root@mbp:/usr/obj/usr/src/sys/GENERIC  amd64
On my Macbook Pro 4.1, after upgrading from 10.0-RELEASE to 10.0-STABLE, the 
atp touchpad driver becomes unresponsive after a few minutes under high I/O 
load, until it stalls completely. The device never unstalls, regardless of 
system load. 

Closing and opening /dev/atp0 (i.e. restarting moused) restores responsiveness 
for a couple of minutes, then it fails in the same manner.

Reverting back /usr/src/sys/dev/usb/input/atp.c from rev. 263063 to rev. 233774 
(as shipped with FreeBSD 10.0-RELEASE) solves the problem completely on my 

Unfortunately, i am not versed in the workings of the atp driver in order to 
debug the new driver any further.
Use the trackpad under high I/O load
Hack: Revert back to /usr/src/sys/dev/usb/input/atp.c as shipped with 
10.0-RELEASE (r. 233774)

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