* [REGRESSION] Touchpad stops working on Trekstor Primebook C13 after Kernel 6.8.0-51
[not found] <cf6f5773-029b-40ea-bf3f-f8231eec7e20@web.de>
@ 2025-12-23 19:35 ` Mirco Kramer
0 siblings, 0 replies; only message in thread
From: Mirco Kramer @ 2025-12-23 19:35 UTC (permalink / raw)
To: jkosina, bentiss, linux-input; +Cc: linux-kernel
Subject: [REGRESSION] Touchpad stops working on Trekstor Primebook C13
after Kernel 6.8.0-51
*Description:* After updating from kernel 6.8.0-51 to 6.8.0-68, the
touchpad on my Trekstor Primebook C13 was no longer functional. It
appears to be an issue with the i2c-hid subsystem on the Apollo Lake
platform.
*Specific Symptom:* > "In 6.8.0-68 and -90, the touchpad fails to track
a single finger. However, if a second finger is placed stationary on the
touchpad surface, the first finger can move the cursor normally. This
suggests a regression in I2C-HID interrupt handling or event filtering
(possibly related to 'Confidence' bits or 'Contact' reporting)."
*Regression:*
Last known working kernel: 6.8.0-51
First known broken kernel: 6.8.0-68
*Hardware:*
Device: Trekstor Primebook C13
Bus: I2C (HID-over-I2C)
*Additional Info:* I suspect a change in the i2c-designware or i2c-hid
drivers between these sub-versions might be the cause.
System:
Kernel: 6.8.0-51-generic arch: x86_64 bits: 64 compiler: gcc v: 13.3.0
clocksource: tsc
Desktop: MATE v: 1.26.2 wm: marco v: 1.26.2 with: mate-panel
tools: mate-screensaver vt: 7 dm: LightDM v: 1.30.0
Distro: Linux Mint 22.2 Zara base: Ubuntu 24.04 noble
Machine:
Type: Convertible System: TREKSTOR product: Primebook C13 v: N/A
serial: <superuser required>
Mobo: TS_weibu model: Apollolake_alk_V01 serial: <superuser required>
part-nu: CFALKWW02464 uuid: <superuser required> UEFI: American
Megatrends
v: BIOS_V1.2.9_20171026 date: 10/26/2017
Battery:
ID-1: BAT0 charge: 26.4 Wh (66.0%) condition: 40.0/40.0 Wh (100.0%)
power: 4.2 W volts: 7.4 min: N/A model: Intel SR 1 SR Real Battery
type: Unknown serial: <filter> status: discharging
CPU:
Info: dual core model: Intel Celeron N3350 bits: 64 type: MCP
smt: <unsupported> arch: Goldmont rev: 9 cache: L1: 112 KiB L2: 2 MiB
Speed (MHz): avg: 798 high: 800 min/max: 800/2400 cores: 1: 796 2: 800
bogomips: 4377
Flags: ht lm nx pae sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx
Graphics:
Device-1: Intel HD Graphics 500 driver: i915 v: kernel arch: Gen-9
ports:
active: eDP-1 empty: DP-1,HDMI-A-1 bus-ID: 00:02.0 chip-ID: 8086:5a85
class-ID: 0300
Device-2: Alcor Micro USB 2.0 PC Camera driver: snd-usb-audio,uvcvideo
type: USB rev: 2.0 speed: 480 Mb/s lanes: 1 bus-ID: 1-8:4 chip-ID:
058f:3841
class-ID: 0102
Display: x11 server: X.Org v: 21.1.11 with: Xwayland v: 23.2.6
compositor: marco v: 1.26.2 driver: X: loaded: modesetting
unloaded: fbdev,vesa dri: iris gpu: i915 display-ID: :0 screens: 1
Screen-1: 0 s-res: 1600x900 s-dpi: 96 s-size: 423x238mm (16.65x9.37")
s-diag: 485mm (19.11")
Monitor-1: eDP-1 model: Najing CEC Panda LC133LF2L01 res: 1600x900
hz: 60
dpi: 138 size: 294x165mm (11.57x6.5") diag: 337mm (13.3") modes:
1920x1080
API: EGL v: 1.5 hw: drv: intel iris platforms: device: 0 drv: iris
device: 1 drv: swrast gbm: drv: iris surfaceless: drv: iris x11:
drv: iris
inactive: wayland
API: OpenGL v: 4.6 compat-v: 4.5 vendor: intel mesa
v: 25.0.7-0ubuntu0.24.04.2 glx-v: 1.4 direct-render: yes renderer:
Mesa
Intel HD Graphics 500 (APL 2) device-ID: 8086:5a85
Audio:
Device-1: Intel Celeron N3350/Pentium N4200/Atom E3900 Series Audio
Cluster
driver: snd_hda_intel v: kernel bus-ID: 00:0e.0 chip-ID: 8086:5a98
class-ID: 0403
Device-2: Alcor Micro USB 2.0 PC Camera driver: snd-usb-audio,uvcvideo
type: USB rev: 2.0 speed: 480 Mb/s lanes: 1 bus-ID: 1-8:4 chip-ID:
058f:3841
class-ID: 0102
API: ALSA v: k6.8.0-51-generic status: kernel-api
Server-1: PipeWire v: 1.0.5 status: active with: 1: pipewire-pulse
status: active 2: wireplumber status: active 3: pipewire-alsa type:
plugin
Network:
Device-1: Intel Wireless 3165 driver: iwlwifi v: kernel pcie:
speed: 2.5 GT/s lanes: 1 bus-ID: 01:00.0 chip-ID: 8086:3165
class-ID: 0280
IF: wlp1s0 state: up mac: <filter>
Bluetooth:
Device-1: Intel Bluetooth wireless interface driver: btusb v: 0.8
type: USB
rev: 2.0 speed: 12 Mb/s lanes: 1 bus-ID: 1-7:3 chip-ID: 8087:0a2a
class-ID: e001
Report: hciconfig ID: hci0 rfk-id: 1 state: down
bt-service: enabled,running rfk-block: hardware: no software: yes
address: <filter>
Drives:
Local Storage: total: 87.97 GiB used: 33.99 GiB (38.6%)
ID-1: /dev/mmcblk0 vendor: HP model: DF4064 size: 58.24 GiB
type: Removable tech: SSD serial: <filter> fw-rev: 0x8 scheme: GPT
ID-2: /dev/mmcblk1 model: SU32G size: 29.72 GiB type: USB tech: SSD
serial: <filter> scheme: MBR
Partition:
ID-1: / size: 56.53 GiB used: 30.52 GiB (54.0%) fs: ext4 dev:
/dev/mmcblk0p2
ID-2: /boot/efi size: 511 MiB used: 6.1 MiB (1.2%) fs: vfat
dev: /dev/mmcblk0p1
Swap:
ID-1: swap-1 type: file size: 3.98 GiB used: 738.2 MiB (18.1%)
priority: -2
file: /swapfile
Sensors:
System Temperatures: cpu: 46.0 C mobo: N/A
Fan Speeds (rpm): N/A
Repos:
Packages: 1931 pm: dpkg pkgs: 1923 pm: flatpak pkgs: 8
No active apt repos in: /etc/apt/sources.list
Active apt repos in:
/etc/apt/sources.list.d/official-package-repositories.list
1: deb https://ftp.fau.de/mint/packages zara main upstream import
backport
2: deb http://ftp.fau.de/ubuntu noble main restricted universe
multiverse
3: deb http://ftp.fau.de/ubuntu noble-updates main restricted
universe multiverse
4: deb http://ftp.fau.de/ubuntu noble-backports main restricted
universe multiverse
5: deb http://security.ubuntu.com/ubuntu/ noble-security main
restricted universe multiverse
Active apt repos in: /etc/apt/sources.list.d/teamviewer.list
1: deb [signed-by=/usr/share/keyrings/teamviewer-keyring.gpg]
https://linux.teamviewer.com/deb stable main
Info:
Memory: total: 4 GiB available: 3.66 GiB used: 2.55 GiB (69.7%)
Processes: 227 Power: uptime: 48m states: freeze,mem,disk suspend: deep
wakeups: 0 hibernate: platform Init: systemd v: 255 target:
graphical (5)
default: graphical
Compilers: gcc: 13.3.0 Shell: Bash v: 5.2.21 running-in: mate-terminal
inxi: 3.3.34
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