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[Mike Ditto <ford@xxxxxxxxxxxx>]

I noticed in dmesg:

Working kernel:
[    3.565137] i2c_hid i2c-SYN1B7D:01: failed to retrieve report from device.
[    3.565306] input: SYN1B7D:01 06CB:2991 UNKNOWN as /devices/platform/80860F41:00/i2c-0/i2c-SYN1B7D:01/0018:06CB:2991.0001/input/input8
[    3.565618] hid-multitouch 0018:06CB:2991.0001: input,hidraw0: <UNKNOWN> HID v1.00 Mouse [SYN1B7D:01 06CB:2991] on

Not working kernel:
[    3.572672] i2c_designware 80860F41:00: controller timed out
[    3.572682] i2c_designware 80860F41:00: Unknown Synopsys component type: 0x00000000
[    3.572690] i2c_hid i2c-SYN1B7D:01: hid_descr_cmd failed

I'll attach both full dmesg logs.

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https://bugs.launchpad.net/bugs/1564237

Title:
  Acer touchpad stopped working with kernel 3.19.0-56

Status in linux-lts-vivid package in Ubuntu:
  New

Bug description:
  After Ubuntu updated the kernel to 3.19.0-56 the touchpad stopped working.
  The mouse pointer never appears and touching/dragging/clicking has no effect.
  I can make it work by using the GRUB menu to boot 3.19.0-49 instead.

  On the older, working, kernel xinput outputs:
  ⎡ Virtual core pointer                    	id=2	[master pointer  (3)]
  ⎜   ↳ Virtual core XTEST pointer              	id=4	[slave  pointer  (2)]
  ⎜   ↳ SYN1B7D:01 06CB:2991 UNKNOWN            	id=11	[slave  pointer  (2)]
  ⎣ Virtual core keyboard                   	id=3	[master keyboard (2)]
      ↳ Virtual core XTEST keyboard             	id=5	[slave  keyboard (3)]
      ↳ Power Button                            	id=6	[slave  keyboard (3)]
      ↳ Video Bus                               	id=7	[slave  keyboard (3)]
      ↳ Power Button                            	id=8	[slave  keyboard (3)]
      ↳ Sleep Button                            	id=9	[slave  keyboard (3)]
      ↳ HD WebCam                               	id=10	[slave  keyboard (3)]
      ↳ AT Translated Set 2 keyboard            	id=12	[slave  keyboard (3)]
      ↳ Acer WMI hotkeys                        	id=13	[slave  keyboard (3)]

  On the new, not working, kernel xinput outputs:
  ⎡ Virtual core pointer                    	id=2	[master pointer  (3)]
  ⎜   ↳ Virtual core XTEST pointer              	id=4	[slave  pointer  (2)]
  ⎣ Virtual core keyboard                   	id=3	[master keyboard (2)]
      ↳ Virtual core XTEST keyboard             	id=5	[slave  keyboard (3)]
      ↳ Power Button                            	id=6	[slave  keyboard (3)]
      ↳ Video Bus                               	id=7	[slave  keyboard (3)]
      ↳ Power Button                            	id=8	[slave  keyboard (3)]
      ↳ Sleep Button                            	id=9	[slave  keyboard (3)]
      ↳ HD WebCam                               	id=10	[slave  keyboard (3)]
      ↳ AT Translated Set 2 keyboard            	id=11	[slave  keyboard (3)]
      ↳ Acer WMI hotkeys                        	id=12	[slave  keyboard (3)]

  Hardware is Acer ES1-111M-C40S laptop.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.19.0-56-generic 3.19.0-56.62~14.04.1
  ProcVersionSignature: Ubuntu 3.19.0-56.62~14.04.1-generic 3.19.8-ckt15
  Uname: Linux 3.19.0-56-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.19
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Wed Mar 30 21:52:31 2016
  InstallationDate: Installed on 2015-10-20 (162 days ago)
  InstallationMedia: Ubuntu 14.04.3 LTS "Trusty Tahr" - Beta amd64 (20150805)
  SourcePackage: linux-lts-vivid
  UpgradeStatus: No upgrade log present (probably fresh install)

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