** Description changed:

- TBD
+ Touchpad on Dell Latitude 3190 may cease to function unexpectedly some
+ time after logging in GUI.
  
- ProblemType: Bug
- DistroRelease: Ubuntu 18.04
- Package: linux-oem 4.15.0.1065.69
- ProcVersionSignature: Ubuntu 4.15.0-1065.75-oem 4.15.18
- Uname: Linux 4.15.0-1065-oem x86_64
- ApportVersion: 2.20.9-0ubuntu7.2
- Architecture: amd64
- Date: Mon Dec 30 01:05:23 2019
- DistributionChannelDescriptor:
-  # This is the distribution channel descriptor for the OEM CDs
-  # For more information see 
http://wiki.ubuntu.com/DistributionChannelDescriptor
-  canonical-oem-somerville-bionic-amd64-20180608-47+bionic-master+X90
- InstallationDate: Installed on 2019-12-20 (9 days ago)
- InstallationMedia: Ubuntu 18.04 "Bionic" - Build amd64 LIVE Binary 
20180608-09:38
- ProcEnviron:
-  TERM=xterm-256color
-  PATH=(custom, no user)
-  LANG=en_US.UTF-8
-  SHELL=/bin/bash
- SourcePackage: linux-meta-oem
- UpgradeStatus: No upgrade log present (probably fresh install)
- --- 
+ By some regression tests it's found this was a direct result of commit
+ f840d7f6870d ("Revert \"pinctrl: intel: Initialize GPIO properly when
+ used through irqchip\"") that was included in stable kernel v4.14.38
+ commit 94c0308279ec and in Ubuntu generic kernel since 4.15.0-24.26 in
+ bug 1775483.
+ 
+ [Step to reproduce]
+ 1. Turn on I2C debug messages "i2c-hid.debug=1 dyndbg='file drivers/i2c/* 
+pt' log_buf_len=32M"
+ 
+ 2. Boot into GUI, and start dmesg capturing by `dmesg -w | tee
+ dmesg.$(uname -r)`
+ 
+ 3. Move fingers around on the touchpad to generate touch events for 1
+ minute.
+ 
+ [Expected result]
+ Touch events generated all the time throughout the process.
+ 
+ [Actual result]
+ Touch event cease to generate after some arbitrary time and there is no way 
to recover.
+ 
+ --
  ProblemType: Bug
  ApportVersion: 2.20.9-0ubuntu7.2
  Architecture: amd64
  AudioDevicesInUse:
-  USER        PID ACCESS COMMAND
-  /dev/snd/controlC0:  gdm        1826 F.... pulseaudio
-                       u          3178 F.... pulseaudio
+  USER        PID ACCESS COMMAND
+  /dev/snd/controlC0:  gdm        1826 F.... pulseaudio
+                       u          3178 F.... pulseaudio
  DistributionChannelDescriptor:
-  # This is the distribution channel descriptor for the OEM CDs
-  # For more information see 
http://wiki.ubuntu.com/DistributionChannelDescriptor
-  canonical-oem-somerville-bionic-amd64-20180608-47+bionic-master+X90
+  # This is the distribution channel descriptor for the OEM CDs
+  # For more information see 
http://wiki.ubuntu.com/DistributionChannelDescriptor
+  canonical-oem-somerville-bionic-amd64-20180608-47+bionic-master+X90
  DistroRelease: Ubuntu 18.04
  InstallationDate: Installed on 2019-12-20 (9 days ago)
  InstallationMedia: Ubuntu 18.04 "Bionic" - Build amd64 LIVE Binary 
20180608-09:38
  IwConfig:
-  wlp1s0    no wireless extensions.
-  
-  lo        no wireless extensions.
+  wlp1s0    no wireless extensions.
+ 
+  lo        no wireless extensions.
  Lsusb:
-  Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
-  Bus 001 Device 003: ID 8087:0a2b Intel Corp. 
-  Bus 001 Device 002: ID 0bda:5769 Realtek Semiconductor Corp. 
-  Bus 001 Device 004: ID 062a:4c01 Creative Labs 
-  Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
+  Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
+  Bus 001 Device 003: ID 8087:0a2b Intel Corp.
+  Bus 001 Device 002: ID 0bda:5769 Realtek Semiconductor Corp.
+  Bus 001 Device 004: ID 062a:4c01 Creative Labs
+  Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  MachineType: Dell Inc. Latitude 3190
  Package: linux-oem 4.15.0.1065.69
  PackageArchitecture: amd64
  ProcEnviron:
-  TERM=xterm-256color
-  PATH=(custom, no user)
-  LANG=en_US.UTF-8
-  SHELL=/bin/bash
+  TERM=xterm-256color
+  PATH=(custom, no user)
+  LANG=en_US.UTF-8
+  SHELL=/bin/bash
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-1065-oem 
root=UUID=9d70e0cd-a1c3-4d16-94cc-4b9ff1115a9a ro mem_sleep_default=deep quiet 
splash i2c-hid.debug=1 hid.debug=1 "dyndbg=file drivers/i2c/* +pt" 
log_buf_len=32M vt.handoff=1
  ProcVersionSignature: Ubuntu 4.15.0-1065.75-oem 4.15.18
  PulseList:
-  Error: command ['pacmd', 'list'] failed with exit code 1: Home directory not 
accessible: Permission denied
-  No PulseAudio daemon running, or not running as session daemon.
+  Error: command ['pacmd', 'list'] failed with exit code 1: Home directory not 
accessible: Permission denied
+  No PulseAudio daemon running, or not running as session daemon.
  RelatedPackageVersions:
-  linux-restricted-modules-4.15.0-1065-oem N/A
-  linux-backports-modules-4.15.0-1065-oem  N/A
-  linux-firmware                           1.173.10
+  linux-restricted-modules-4.15.0-1065-oem N/A
+  linux-backports-modules-4.15.0-1065-oem  N/A
+  linux-firmware                           1.173.10
  Tags:  bionic
  Uname: Linux 4.15.0-1065-oem x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups:
-  
+ 
  _MarkForUpload: True
  dmi.bios.date: 09/19/2019
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: 1.9.1
  dmi.board.vendor: Dell Inc.
  dmi.chassis.type: 10
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: 
dmi:bvnDellInc.:bvr1.9.1:bd09/19/2019:svnDellInc.:pnLatitude3190:pvr:rvnDellInc.:rn:rvr:cvnDellInc.:ct10:cvr:
  dmi.product.family: Latitude
  dmi.product.name: Latitude 3190
  dmi.sys.vendor: Dell Inc.

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https://bugs.launchpad.net/bugs/1857874

Title:
  Touchpad cease to function

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