kernel-packages team mailing list archive

[Eugene San <eugenesan@xxxxxxxxx>]

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

Status in linux package in Ubuntu:
  New

Bug description:
  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

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