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[Biscuit Wang <biscuit_2014@xxxxxxxxxxx>]

Public bug reported:

Hardware : ASUS K401L   (K401LB5200)
kernel: Linux biscuit 3.19.0-30-generic #34~14.04.1-Ubuntu SMP Fri Oct 2 22:09:39 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux

When the system startup, the touchpad works well, but after it resumed
from a suspend, the touchpad hardware will disappear from xinput and
cat /proc/bus/input/devices.

Before suspend, xinput output

⎡ Virtual core pointer                    	id=2	[master pointer  (3)]
⎜   ↳ Virtual core XTEST pointer              	id=4	[slave  pointer  (2)]
⎜   ↳  USB OPTICAL MOUSE                      	id=10	[slave  pointer  (2)]
⎜   ↳ ETPS/2 Elantech Touchpad                	id=14	[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)]
    ↳ Video Bus                               	id=8	[slave  keyboard (3)]
    ↳ Sleep Button                            	id=9	[slave  keyboard (3)]
    ↳ USB2.0 VGA UVC WebCam                   	id=11	[slave  keyboard (3)]
    ↳ Asus WMI hotkeys                        	id=12	[slave  keyboard (3)]
    ↳ AT Translated Set 2 keyboard            	id=13	[slave  keyboard (3)]

after suspend, the output

⎡ Virtual core pointer                    	id=2	[master pointer  (3)]
⎜   ↳ Virtual core XTEST pointer              	id=4	[slave  pointer  (2)]
⎜   ↳  USB OPTICAL MOUSE                      	id=10	[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)]
    ↳ Video Bus                               	id=8	[slave  keyboard (3)]
    ↳ Sleep Button                            	id=9	[slave  keyboard (3)]
    ↳ USB2.0 VGA UVC WebCam                   	id=11	[slave  keyboard (3)]
    ↳ Asus WMI hotkeys                        	id=12	[slave  keyboard (3)]
    ↳ AT Translated Set 2 keyboard            	id=13	[slave  keyboard (3)]

And you can find that the " ETPS/2 Elantech Touchpad" is missing

After a reboot, everything works well again.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: linux-image-3.19.0-30-generic 3.19.0-30.34~14.04.1
ProcVersionSignature: Ubuntu 3.19.0-30.34~14.04.1-generic 3.19.8-ckt6
Uname: Linux 3.19.0-30-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.15
Architecture: amd64
CurrentDesktop: Unity
Date: Thu Oct 15 15:54:20 2015
InstallationDate: Installed on 2015-10-14 (0 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)

** Affects: linux-lts-vivid (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug trusty

** Attachment added: "futher info before and after suspend"
   https://bugs.launchpad.net/bugs/1506363/+attachment/4495416/+files/k401l_touchpad_die.tar.gz

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https://bugs.launchpad.net/bugs/1506363

Title:
  Touchpad die after resume from suspend(s2ram)

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

Bug description:
  Hardware : ASUS K401L   (K401LB5200)
  kernel: Linux biscuit 3.19.0-30-generic #34~14.04.1-Ubuntu SMP Fri Oct 2 22:09:39 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux

  When the system startup, the touchpad works well, but after it resumed
  from a suspend, the touchpad hardware will disappear from xinput and
  cat /proc/bus/input/devices.

  Before suspend, xinput output

  ⎡ Virtual core pointer                    	id=2	[master pointer  (3)]
  ⎜   ↳ Virtual core XTEST pointer              	id=4	[slave  pointer  (2)]
  ⎜   ↳  USB OPTICAL MOUSE                      	id=10	[slave  pointer  (2)]
  ⎜   ↳ ETPS/2 Elantech Touchpad                	id=14	[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)]
      ↳ Video Bus                               	id=8	[slave  keyboard (3)]
      ↳ Sleep Button                            	id=9	[slave  keyboard (3)]
      ↳ USB2.0 VGA UVC WebCam                   	id=11	[slave  keyboard (3)]
      ↳ Asus WMI hotkeys                        	id=12	[slave  keyboard (3)]
      ↳ AT Translated Set 2 keyboard            	id=13	[slave  keyboard (3)]

  after suspend, the output

  ⎡ Virtual core pointer                    	id=2	[master pointer  (3)]
  ⎜   ↳ Virtual core XTEST pointer              	id=4	[slave  pointer  (2)]
  ⎜   ↳  USB OPTICAL MOUSE                      	id=10	[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)]
      ↳ Video Bus                               	id=8	[slave  keyboard (3)]
      ↳ Sleep Button                            	id=9	[slave  keyboard (3)]
      ↳ USB2.0 VGA UVC WebCam                   	id=11	[slave  keyboard (3)]
      ↳ Asus WMI hotkeys                        	id=12	[slave  keyboard (3)]
      ↳ AT Translated Set 2 keyboard            	id=13	[slave  keyboard (3)]

  And you can find that the " ETPS/2 Elantech Touchpad" is missing

  After a reboot, everything works well again.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.19.0-30-generic 3.19.0-30.34~14.04.1
  ProcVersionSignature: Ubuntu 3.19.0-30.34~14.04.1-generic 3.19.8-ckt6
  Uname: Linux 3.19.0-30-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.15
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Thu Oct 15 15:54:20 2015
  InstallationDate: Installed on 2015-10-14 (0 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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