$ git tag --contains af93a167eda90192563bce64c4bb989836afac1f
Ubuntu-6.8.0-10.10
Ubuntu-6.8.0-11.11
Ubuntu-6.8.0-6.6
Ubuntu-6.8.0-7.7
Ubuntu-6.8.0-8.8
Ubuntu-6.8.0-9.9
v6.8
v6.8-rc1

The first commit is already in 6.8.0-22.
Could you double confirm if the 2nd link is the real fix?

I don't reproduce this issue with the same touchpad:
ThinkPad BIOS N3YET57W (1.22 ), EC N3YHT43W

Device:           SNSL0028:00 2C2F:0028 Touchpad
Kernel:           /dev/input/event12
Group:            5
Seat:             seat0, default
Size:             118x68mm
Capabilities:     pointer gesture
Tap-to-click:     disabled
Tap-and-drag:     enabled
Tap drag lock:    disabled
Left-handed:      disabled
Nat.scrolling:    disabled
Middle emulation: disabled
Calibration:      n/a
Scroll methods:   *two-finger edge 
Click methods:    *button-areas clickfinger 
Disable-w-typing: enabled
Disable-w-trackpointing: enabled
Accel profiles:   flat *adaptive custom
Rotation:         n/a

$ journalctl -k |grep SNSL
Apr 16 13:28:02 Thames-3 kernel: i2c_hid_acpi i2c-SNSL0028:00: device did not 
ack reset within 1000 ms
Apr 16 13:28:02 Thames-3 kernel: input: SNSL0028:00 2C2F:0028 Mouse as 
/devices/pci0000:00/0000:00:15.0/i2c_designware.0/i2c-1/i2c-SNSL0028:00/0018:2C2F:0028.0002/input/input10
Apr 16 13:28:02 Thames-3 kernel: input: SNSL0028:00 2C2F:0028 Touchpad as 
/devices/pci0000:00/0000:00:15.0/i2c_designware.0/i2c-1/i2c-SNSL0028:00/0018:2C2F:0028.0002/input/input11
Apr 16 13:28:02 Thames-3 kernel: hid-generic 0018:2C2F:0028.0002: 
input,hidraw1: I2C HID v1.00 Mouse [SNSL0028:00 2C2F:0028] on i2c-SNSL0028:00
Apr 16 13:28:03 Thames-3 kernel: input: SNSL0028:00 2C2F:0028 Mouse as 
/devices/pci0000:00/0000:00:15.0/i2c_designware.0/i2c-1/i2c-SNSL0028:00/0018:2C2F:0028.0002/input/input20
Apr 16 13:28:03 Thames-3 kernel: input: SNSL0028:00 2C2F:0028 Touchpad as 
/devices/pci0000:00/0000:00:15.0/i2c_designware.0/i2c-1/i2c-SNSL0028:00/0018:2C2F:0028.0002/input/input21
Apr 16 13:28:03 Thames-3 kernel: hid-multitouch 0018:2C2F:0028.0002: 
input,hidraw1: I2C HID v1.00 Mouse [SNSL0028:00 2C2F:0028] on i2c-SNSL0028:00


** Changed in: linux (Ubuntu Noble)
       Status: New => Triaged

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https://bugs.launchpad.net/bugs/2061040

Title:
  I2C HID device sometimes fails to initialize causing touchpad to not
  work

Status in linux package in Ubuntu:
  Triaged
Status in linux source package in Noble:
  Triaged

Bug description:
  Hi,

  Touchpad on my new Lenovo X1 Carbon (Gen12) with the Sensel haptic pad
  doesn't work on boot. I see this:

  | [Thu Apr 11 13:57:26 2024] i2c_hid_acpi i2c-SNSL0028:00: device did not ack 
reset within 1000 ms
  | [Thu Apr 11 13:57:26 2024] hid-generic 0018:2C2F:0028.0001: unknown main 
item tag 0x0
  | [Thu Apr 11 13:57:26 2024] hid-generic 0018:2C2F:0028.0001: unknown main 
item tag 0x0
  | [Thu Apr 11 13:57:26 2024] hid-generic 0018:2C2F:0028.0001: unknown main 
item tag 0x0
  | [Thu Apr 11 13:57:26 2024] hid-generic 0018:2C2F:0028.0001: unknown main 
item tag 0x0
  | [Thu Apr 11 13:57:26 2024] hid-generic 0018:2C2F:0028.0001: unknown main 
item tag 0x0
  | [Thu Apr 11 13:57:26 2024] hid-generic 0018:2C2F:0028.0001: unknown main 
item tag 0x0
  | [Thu Apr 11 13:57:26 2024] hid-generic 0018:2C2F:0028.0001: unknown main 
item tag 0x0
  | [Thu Apr 11 13:57:26 2024] hid-generic 0018:2C2F:0028.0001: unknown main 
item tag 0x0
  | [Thu Apr 11 13:57:26 2024] hid-generic 0018:2C2F:0028.0001: unknown main 
item tag 0x0
  | [Thu Apr 11 13:57:26 2024] hid-generic 0018:2C2F:0028.0001: unknown main 
item tag 0x0
  | [Thu Apr 11 13:57:26 2024] hid-generic 0018:2C2F:0028.0001: unknown main 
item tag 0x0
  | ...
  | [Thu Apr 11 13:57:26 2024] hid-generic 0018:2C2F:0028.0001: unbalanced 
collection at end of report description
  | [Thu Apr 11 13:57:26 2024] hid-generic: probe of 0018:2C2F:0028.0001 failed 
with error -22

  Per the Arch Linux wiki page[1], removing and reloading the
  `i2c_hid_acpi` seems to fix it:

  | [Thu Apr 11 13:58:02 2024] i2c_hid_acpi i2c-SNSL0028:00: device did not ack 
reset within 1000 ms
  | [Thu Apr 11 13:58:02 2024] input: SNSL0028:00 2C2F:0028 Mouse as 
/devices/pci0000:00/0000:00:15.0/i2c_designware.0/i2c-15/i2c-SNSL0028:00/0018:2C2F:0028.0002/input/input15
  | [Thu Apr 11 13:58:02 2024] input: SNSL0028:00 2C2F:0028 Touchpad as 
/devices/pci0000:00/0000:00:15.0/i2c_designware.0/i2c-15/i2c-SNSL0028:00/0018:2C2F:0028.0002/input/input16
  | [Thu Apr 11 13:58:02 2024] hid-multitouch 0018:2C2F:0028.0002: 
input,hidraw0: I2C HID v1.00 Mouse [SNSL0028:00 2C2F:0028] on i2c-SNSL0028:00
  | [Thu Apr 11 13:58:03 2024] psmouse serio1: trackpoint: Synaptics TrackPoint 
firmware: 0x08, buttons: 3/3
  | [Thu Apr 11 13:58:03 2024] input: TPPS/2 Synaptics TrackPoint as 
/devices/platform/i8042/serio1/input/input18

  From that Arch Linux wiki page, it seems to be a bug upstream[2] with
  the commit fixing this:

  |
  
https://github.com/torvalds/linux/commit/af93a167eda90192563bce64c4bb989836afac1f

  Or

  | https://lore.kernel.org/linux-
  input/20240331182440.14477-1...@kl.wtf/T/#u

  Can we get fix this backported?

  | [hloeung@dharkan tmp]$ apt-cache policy linux-image-generic-hwe-24.04
  | linux-image-generic-hwe-24.04:
  |   Installed: 6.8.0-22.22
  |   Candidate: 6.8.0-22.22
  |   Version table:
  |  *** 6.8.0-22.22 500
  |         500 http://haw-test.archive.ubuntu.com/ubuntu noble/main amd64 
Packages
  |         100 /var/lib/dpkg/status
  | [hloeung@dharkan tmp]$ uname -a
  | Linux dharkan.local 6.8.0-22-generic #22-Ubuntu SMP PREEMPT_DYNAMIC Thu Apr 
 4 22:30:32 UTC 2024 x86_64 x86_64 x86_64 GNU/Linux
  | [hloeung@dharkan tmp]$

  Thanks,

  Haw

  [1]: https://wiki.archlinux.org/title/Lenovo_ThinkPad_Z16_Gen_2
  [2]: https://bugzilla.redhat.com/show_bug.cgi?id=2271136

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