[Xenial][SRU][PATCH] #LP1593124 Add proper palm detection support for MS Precision Touchpad

Phidias Chiang phidias.chiang at canonical.com
Wed Jul 13 08:45:32 UTC 2016


[Impact]

Sometimes touchpad doesn't work properly after palm is rejected.
The pointer either jumping around (described on bugzilla[1]) or
doesn't move at all (in our cases).

This problem is introduced with commit: 

commit 25a84db15b3f3a24d3ea7d2baf90693bcff34b0c
Author:     Allen Hung <allen_hung at dell.com>

    HID: multitouch: enable palm rejection if device implements confidence usage

Commit 25a84db applies to Xenial and Yakkety so only these two
release were affected.

[1]: https://bugzilla.kernel.org/show_bug.cgi?id=112791

[Fix]

The maintainer has provided a patch set to fix this issue and add proper
palm detection support and the patch set has been merged. First patch
is to revert the bad commit, and the second is to implement the palm
rejection feature.

[Test]

Test shows palm detection works normally after merging the patch set.

Allen Hung (2):
  Revert "HID: multitouch: enable palm rejection if device implements
    confidence usage"
  HID: multitouch: enable palm rejection for Windows Precision Touchpad

 drivers/hid/hid-multitouch.c | 21 ++++++++++++++-------
 1 file changed, 14 insertions(+), 7 deletions(-)

-- 
2.7.3





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