** Description changed:
Touchpad on Dell Latitude 3190 may cease to function unexpectedly some
time after logging in GUI.
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.
+
+ The original upstream bug for that pinctrl fix is at
+ https://bugzilla.redhat.com/show_bug.cgi?id=1543769 for ASUS FX503VD,
+ and it's later found to cause screen backlight failure. Further fixes
+ was landed in later kernel versions, but for 4.15 and older, it didn't
+ seem to justify the necessity of more complex patches into stable
+ kernel, so the pinctrl fix was then reverted instead, and the original
+ touchpad cease to function issue was not actually fixed ever since.
[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
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
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.
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
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
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.
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
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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