Public bug reported:
After suspend/resume, the Synaptics clickpad reports BTN_LEFT=1 about
one second after resume, with no finger on the pad, and never releases
it (seen in both raw captures made; see EARLIER EPISODES for the
others). The desktop then treats the pointer as dragging: text selects
as soon as the pointer moves, and clicks are ignored until logout.
ENVIRONMENT
Machine: LENOVO 20Y10011US, ThinkPad P14s Gen 1 (AMD)
BIOS: R1BET87W (1.56), 06/04/2026
OS/kernel: Ubuntu 26.04, 7.0.0-42-generic (linux-image 7.0.0-42.42)
Session: GNOME Shell 50.1 on Wayland, libinput 1.31.1
Sleep: mem_sleep = s2idle [deep]; suspends are S3 ("deep")
Touchpad: "SynPS/2 Synaptics TouchPad", Phys isa0060/serio1/input0,
PNP LEN2064 PNP0f13, fw 10.32, id 0x1e2a1, board id 3471,
/dev/input/event6; INPUT_PROP_BUTTONPAD
Driver: psmouse (PS/2). TrackPoint is "TPPS/2 Elan TrackPoint"
(event7), on the Synaptics pass-through port.
STEPS TO REPRODUCE (no applications needed)
1. Log in. Record the raw touchpad stream:
sudo cat /dev/input/event6 > raw.bin
2. systemctl suspend. Resume. Touch nothing for 10 seconds.
3. Move the pointer (TrackPoint is enough). A text selection or
drag starts.
OBSERVED (raw kernel events, EV_KEY only; traces attached)
Run 2 (trace2-raw-evkey.txt), suspend entry 14:33:53, resume 14:34:04:
14:33:53.719 BTN_LEFT 0 at suspend entry
(no events at all for 11.8 s)
14:34:05.509 BTN_LEFT 1 ~1.5 s after resume, no touch
(no events for 24.7 s; no BTN_LEFT release for the rest of the file)
Run 1 (trace1-raw-evkey.txt), suspend entry 14:23:53, resume 14:23:59:
14:23:53.368 BTN_LEFT 0
14:24:00.473 BTN_LEFT 1 ~1 s after resume, no touch, no release
libinput (1.31.1) passes the press through faithfully:
"event6 POINTER_BUTTON BTN_LEFT pressed, seat count: 1", never
released (libinput-buttons-excerpt.txt). The TrackPoint's buttons
(event7) still press and release normally while the touchpad's is
stuck.
The first BTN_LEFT event in each capture is a release with no press
earlier in the capture. The kernel input core only emits a 0 when it
believes the bit was 1, so I do not know how the bit became 1, or
whether this release is related.
EARLIER EPISODES (libinput-level capture only, no raw stream)
13:56 resume: press ~1.4 s after the wake key, never released.
14:10 and 14:11 resumes (a different pattern): the press came ~27 s
and ~20 s after the resume, with typing in between. The first was
released ~1 s after the next suspend entry, as in the raw runs; the
second was never released. I cannot say whether those were phantom
presses or the pad being touched. An earlier episode on Oct 19
(previous boot) had the same symptoms; nothing was captured and the
cause is not confirmed.
WHAT I TRIED
- Reloading psmouse (modprobe -r / modprobe): the press still occurs
on the next resume (the 13:56 episode followed a reload at 13:39).
- psmouse.synaptics_intertouch=1, also with rmi_smbus preloaded:
the driver logs "Trying to set up SMBus access" then "SMbus
companion is not ready yet" and falls back to PS/2, so the RMI
path is not available here (intertouch-attempt.txt). The boot-time
hint in dmesg is the same message the driver prints about LEN2064.
- Touchpad disabled in GNOME (send-events disabled): one suspend/
resume cycle, no wedge. This is the only workaround found; it
costs the touchpad.
NOT KNOWN
- Whether other kernel versions are affected, or whether a BIOS/EC
update changes it. I have not tried an older kernel.
- Whether the press originates in the touchpad firmware or in the
driver's resume path (the log shows the driver re-querying the pad
at resume, ~1 s before the press).
- Whether a fresh boot, rather than a login/logout, changes the
first-resume behaviour. All runs above are on one boot (11:53).
ATTACHMENTS
trace1-raw-evkey.txt, trace2-raw-evkey.txt decoded EV_KEY events
trace1-kernel-journal.txt, trace2-kernel-journal.txt PM/psmouse lines
libinput-buttons-excerpt.txt libinput debug-events button lines
intertouch-attempt.txt the SMBus fallback messages
ProblemType: Bug
DistroRelease: Ubuntu 26.04
Package: linux-image-7.0.0-42-generic 7.0.0-42.42
ProcVersionSignature: Ubuntu 7.0.0-42.42-generic 7.0.14
Uname: Linux 7.0.0-42-generic x86_64
ApportVersion: 2.34.1-0ubuntu0.1
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC2: user 259203 F.... wireplumber
/dev/snd/controlC1: user 259203 F.... wireplumber
/dev/snd/controlC0: user 259203 F.... wireplumber
/dev/snd/seq: user 259192 F.... pipewire
CasperMD5CheckResult: pass
CurrentDesktop: ubuntu:GNOME
Date: Thu Oct 29 15:20:37 2026
InstallationDate: Installed on 2026-08-02 (88 days ago)
InstallationMedia: Ubuntu 26.04 "Resolute Raccoon" - Release amd64 (20260423.1)
MachineType: LENOVO 20Y10011US
ProcEnviron:
LANG=en_US.UTF-8
PATH=(custom, no user)
SHELL=/bin/bash
TERM=xterm-256color
XDG_RUNTIME_DIR=<set>
ProcFB: 0 amdgpudrmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-7.0.0-42-generic
root=/dev/mapper/ubuntu--vg-ubuntu--lv ro quiet splash
crashkernel=2G-4G:320M,4G-32G:512M,32G-64G:1024M,64G-128G:2048M,128G-:4096M
PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No
PulseAudio daemon running, or not running as session daemon.
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
WifiSyslog: (removed)
dmi.bios.date: 06/04/2026
dmi.bios.release: 1.56
dmi.bios.vendor: LENOVO
dmi.bios.version: R1BET87W(1.56 )
dmi.board.asset.tag: Not Available
dmi.board.name: 20Y10011US
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.ec.firmware.release: 1.56
dmi.modalias:
dmi:bvnLENOVO:bvrR1BET87W(1.56):bd06/04/2026:br1.56:efr1.56:svnLENOVO:pn20Y10011US:pvrThinkPadP14sGen1:rvnLENOVO:rn20Y10011US:rvrSDK0J40697WIN:cvnLENOVO:ct10:cvrNone:skuLENOVO_MT_20Y1_BU_Think_FM_ThinkPadP14sGen1:pfaThinkPadP14sGen1:
dmi.product.family: ThinkPad P14s Gen 1
dmi.product.name: 20Y10011US
dmi.product.sku: LENOVO_MT_20Y1_BU_Think_FM_ThinkPad P14s Gen 1
dmi.product.version: ThinkPad P14s Gen 1
dmi.sys.vendor: LENOVO
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug resolute wayland-session
** Attachment added: "raw touchpad traces, kernel journal excerpts, libinput
excerpt, SMBus attempt"
https://bugs.launchpad.net/bugs/2172546/+attachment/6013503/+files/attachments-combined.txt
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https://bugs.launchpad.net/bugs/2172546
Title:
phantom BTN_LEFT press after S3 resume (ThinkPad P14s Gen 1 AMD,
LEN2064)
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