Public bug reported:
Driver update in Kernel 4.2 causes severe usability issues with Cypress
touchpad (cyapa) used on Acer C7x0 chromebooks.
The driver in question is ignoring events during entering/leaving idle
status which from user standpoint seems like touchpad is not reacting to
actions performed after touchpad is not used for more then 2 seconds.
The bug was partially fixed in 4.3 and additional fix was pushed to
upcoming 4.5.
After direct communication with driver maintainer, we came up with 2 patches
fixing the problem.
Since 4.2 is EOL now, the patches cannot be pushed into upstream therefor are
posted here.
First patch is a backport of driver from 4.3 to 4.2 and the second patch
is additional fix that should be applied on 4.3/4.4.
Tested:
- 4.2.0-23-generic #28~14.04.1-Ubuntu on Acer C710
- 4.4 mainline on Acer C720p
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Patch added: "input-cyapa-fix.tar.xz"
https://bugs.launchpad.net/bugs/1534661/+attachment/4550561/+files/input-cyapa-fix.tar.xz
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https://bugs.launchpad.net/bugs/1534661
Title:
regression: Cypress touchpad driver (cyapa) ignores events after bieng
idle for 2 seconds
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