kernel-packages team mailing list archive

[AceLan Kao <1305522@xxxxxxxxxxxxxxxxxx>]

Hans,
I tried to observe the [DLL063E] kernel thread on my laptop with powertop, and can't reproduce the same value.
I keep moving my finger on touchpad as fast as possible for a whole powertop refresh cycle and got the max values I can observe.
Usage Events/s Category Description
587 us/s 0.6 Process [irq/39-DLLL063E:]

The events counter on your laptop is too high, that's the problem.
Could you do the following commands and attach the following log?
1. dmesg > dmesg.log
2. the ftrace log
   sudo su
   cd /sys/kernel/debug/tracing
   echo function > current_tracer
   echo :mod:hid_rmi > set_ftrace_filter  # please don't touch the touchpad after enter this command
   cp trace /tmp/trace.no_touch
   # a single tap on touchpad
   cp trace /tmp/trace.tap
3. attach dmesg.log, /tmp/trace.no_touch, and /tmp/trace.tap
Thanks.

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https://bugs.launchpad.net/bugs/1305522

Title:
  Backport Synaptics HID touchpad driver for 14.04

Status in “linux” package in Ubuntu:
  In Progress
Status in “linux” source package in Trusty:
  In Progress

Bug description:
  Synaptics just upstreamed a new set of HID touchpad driver:

  http://git.kernel.org/cgit/linux/kernel/git/jikos/hid.git/commit/?h=for-3.16/rmi4&id=9fb6bf02e3ad04c20edb8e46536ce3eeda32c736

  It's better we can have it in 14.04 .

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