Ubuntu
xserver-xorg-input-synaptics package

  1. Bug #936552
  2. Comment #2

Comment 2 for bug 936552

Revision history for this message
Clint Byrum (clint-fewbar) wrote : Re: MacBookAir 4,1 trackpad does not work with synaptics driver until boot into 3.2.1 kernel..

To provide the sequence of what I think is relevant log files, I did this:

boot cold in to 3.2.0-17 -- trackpad not working (precise-kernel-coldboot)
warm reboot into 3.2.0-17 again -- trackpad not working (precise-kernel-reboot)
warm reboot into 3.2.1-030201 -- trackpad works (upstream-kernel-reboot)
warm reboot into 3.2.0-17 -- trackpad works (precise-kernel-afterupstream)

I saved Xorg.0.log and dmesg after each boot. After stripping off the timestamps, I notice that the main difference is that the apple trackpad is initialized *much* later with the 'afterupstream'. Also I notice that this message is no longer in dmesg after the upstream 3.2.1 kernel is booted:

bdi 1:0: hash matches
acpi device:19: hash matches

I have attached the results of this debugging sequence, the tags in parenthesis above correspond to the log file names.