[Bug 1791427] Re: Touchpad and/or trackpoint stop working after S3 suspend on Lenovo X1 Carbon 6th

My dmesg output immediately after resuming from suspend. I had enabled
S3 in BIOS and consequently the touchpad was not working. However, I had
a USB mouse on the go - for, otherwise, I would have trouble using the
computer in that state.

** Attachment added: "dmesg.txt"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1791427/+attachment/5220211/+files/dmesg.txt

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https://bugs.launchpad.net/bugs/1791427

Title:
Touchpad and/or trackpoint stop working after S3 suspend on Lenovo X1
Carbon 6th

Status in linux package in Ubuntu:
Triaged

Bug description:
Ubuntu 18.04.1

Terminology in case we use different terms:
touchpad - just the rectangular touch-sensitive surface below the keyboard (xinput lists it as Synaptics TM3288-011)
trackpoint - the red thingy built into the keyboard + 3 physical buttons below the keyboard (trackpoint and buttons are integrated together; listed in xinput as TPPS/2 Elan TrackPoint)

On September 7th, 2018, Lenovo has issued a BIOS update (v1.30), which
enables proper S3 deep sleep state - users no longer have to patch
DSDT tables to get it. It can be enabled in the BIOS settings. In X1
carbon 6th generation models that have NFC, when laptop wakes from
suspend by opening the lid, in most cases both touchpad and trackpoint
stop working completely. They are also no longer listed when running
xinput command. Sometimes just one of them stops working, usually the
trackpoint. In some rare cases it is possible to bring them back by
using these commands:

echo -n none > /sys/devices/platform/i8042/serio1/drvctl
echo -n reconnect > /sys/devices/platform/i8042/serio1/drvctl
rmmod psmouse
modprobe psmouse

These worked properly when waking up from S2Idle sleep state (had
these in a script that runs after waking the machine from suspend),
but with S3 deep sleep these rarely work and the only way to bring
back touchpad and/or trackpoint is turning off the machine and turning
it on (restart does not help).

I could not find any pattern that would show when the input devices
stop working or start working again using the commands mentioned
above. It's completely random from my perspective.

This is happening on the standard issue 4.15.0-33-generic kernel that
shipped with my Ubuntu 18.04 (with updates), as well as with newer
mainline kernels, such as the newest point versions of 4.17, 4.18 and
4.19 RC2.

This happens regardless of whether "blacklist i2c_i801" is commented
out in /etc/modprobe.d/blacklist.conf or not. It happens regardless of
whether "psmouse.synaptics_intertouch=1" is passed as grub parameter.
Presence of TLP does not make it better, nor worse.

It appears that non-NFC models are not affected. I know at least one
Arch Linux user who has the exact same model, but without this issue.
I'm using synaptics driver (no libinput installed), he uses libinput
and doesn't have synaptics, if that information is of any use.
Libinput does not seem to help.

This forum thread also has more details from users who updated their
BIOS to get S3 suspend: https://forums.lenovo.com/t5/Linux-
Discussion/X1-Carbon-Gen-6-cannot-enter-deep-sleep-S3-state-aka-
Suspend-to/td-p/3998182/page/27

Another related thread:
https://bbs.archlinux.org/viewtopic.php?id=236367

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: linux-image-4.15.0-33-generic 4.15.0-33.36
ProcVersionSignature: Ubuntu 4.15.0-33.36-generic 4.15.18
Uname: Linux 4.15.0-33-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.3
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/pcmC0D0p: maciej 2651 F...m pulseaudio
/dev/snd/controlC0: maciej 2651 F.... pulseaudio
CurrentDesktop: i3
Date: Sat Sep 8 13:45:43 2018
HibernationDevice: RESUME=UUID=3116dcb0-d91e-4b2a-8166-43b7a9a9d36e
InstallationDate: Installed on 2018-07-21 (49 days ago)
InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
Lsusb:
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 003: ID 13d3:56b2 IMC Networks
Bus 001 Device 002: ID 04b4:0060 Cypress Semiconductor Corp. Wireless optical mouse
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
MachineType: LENOVO 20KH006KPB
ProcFB:
0 EFI VGA
1 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.15.0-33-generic root=/dev/mapper/ubuntu--vg-root ro quiet splash psmouse.synaptics_intertouch=1 vt.handoff=1
RelatedPackageVersions:
linux-restricted-modules-4.15.0-33-generic N/A
linux-backports-modules-4.15.0-33-generic N/A
linux-firmware 1.173.1
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 08/31/2018
dmi.bios.vendor: LENOVO
dmi.bios.version: N23ET55W (1.30 )
dmi.board.asset.tag: Not Available
dmi.board.name: 20KH006KPB
dmi.board.vendor: LENOVO
dmi.board.version: SDK0J40697 WIN
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: None
dmi.modalias: dmi:bvnLENOVO:bvrN23ET55W(1.30):bd08/31/2018:svnLENOVO:pn20KH006KPB:pvrThinkPadX1Carbon6th:rvnLENOVO:rn20KH006KPB:rvrSDK0J40697WIN:cvnLENOVO:ct10:cvrNone:
dmi.product.family: ThinkPad X1 Carbon 6th
dmi.product.name: 20KH006KPB
dmi.product.version: ThinkPad X1 Carbon 6th
dmi.sys.vendor: LENOVO

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