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Bug#1092931: marked as done (Most recent kernel is causing issues with touchpad function.)

Your message dated Sun, 13 Jul 2025 14:22:11 +0200
with message-id <7255d51074ac7314a849c371dfec00a35a5456ef.camel@decadent.org.uk>
and subject line Re: figured something out
has caused the Debian Bug report #1092931,
regarding Most recent kernel is causing issues with touchpad function.
to be marked as done.

This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
Bug report if necessary, and/or fix the problem forthwith.

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-- 
1092931: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1092931
Debian Bug Tracking System
Contact owner@bugs.debian.org with problems
--- Begin Message --- 
Package: buildd.debian.org
Severity: important
X-Debbugs-Cc: kynsey@protonmail.com

Dear Maintainer,

   * What led up to the situation?
	Updating to the latest kernel. The trackpad starts out fine after a reboot then gets more and more input lag as time goes on until it ceases to function. 
   * What exactly did you do (or not do) that was effective (or
     ineffective)? Reverted back to an older kernel. This issue is not exclusive to debian i had switched to debian stable bookworm a few months ago because i had this issue on other distros and didn't on debian. With most recent kernel the issue is now on debian too. 
   * What was the outcome of this action?
It fixes the issue if i use an older kernel currently using Debian 6.1.119-1 (2024-11-22) and not having the issue, but using the kernel from this month causes it to occur. 
   * What outcome did you expect instead? i would expect the newer kernel to not break my touchpad.

Other info: Device is a Dell Latitude 7400. Other distros i had tried which also had this issue a few months ago before i switched to debian are, Manjaro, Mint, Pop, OpenSUSE. Based on the behavior i believe something is causing the inputs from the trackpad to get backed up. Sometimes the laptop being under heavy load can cause the issue to worsen more quickly. 
Input device info: Device:           DELL08E1:00 06CB:CD97 Touchpad
Kernel:           /dev/input/event5
Group:            6
Seat:             seat0, default
Size:             100x50mm
Capabilities:     pointer gesture
Tap-to-click:     disabled
Tap-and-drag:     enabled
Tap drag lock:    disabled
Left-handed:      disabled
Nat.scrolling:    disabled
Middle emulation: n/a
Calibration:      n/a
Scroll methods:   *two-finger edge 
Click methods:    none
Disable-w-typing: enabled
Disable-w-trackpointing: enabled
Accel profiles:   flat *adaptive
Rotation:         n/a


Device:           DELL08E1:00 06CB:CD97 Mouse
Kernel:           /dev/input/event4
Group:            6
Seat:             seat0, default
Capabilities:     pointer 
Tap-to-click:     n/a
Tap-and-drag:     n/a
Tap drag lock:    n/a
Left-handed:      disabled
Nat.scrolling:    disabled
Middle emulation: n/a
Calibration:      n/a
Scroll methods:   *button
Click methods:    none
Disable-w-typing: n/a
Disable-w-trackpointing: n/a
Accel profiles:   flat *adaptive
Rotation:         n/a


Device:           PS/2 Generic Mouse
Kernel:           /dev/input/event6
Group:            11
Seat:             seat0, default
Capabilities:     pointer 
Tap-to-click:     n/a
Tap-and-drag:     n/a
Tap drag lock:    n/a
Left-handed:      disabled
Nat.scrolling:    disabled
Middle emulation: disabled
Calibration:      n/a
Scroll methods:   *button
Click methods:    none
Disable-w-typing: n/a
Disable-w-trackpointing: n/a
Accel profiles:   flat *adaptive
Rotation:         n/a


I do not have any external devices plugged in so all of these are related to the built in touchpad i think. 

I understand this may be tough to fix without access to the hardware itself, but im hoping since its a recent issue in debian that something was changed to cause it and can be easily reverted. If you need any more information please reach out to me and i will get it for you.

--- End Message ---
--- Begin Message --- 
Hi,

On Tue, 14 Jan 2025 18:19:08 +0000 Kyn <Kynsey@protonmail.com> wrote:
> ok so i have figured out that the issue only happens while the laptops barrel
> charger is plugged in. If i am using USB-C charging it does not happen, and does
> not happen on battery as far as i can tell. But once the barrel charger is
> plugged in it starts to act up slowly over time. Its hard to be sure since it
> takes a few hours to really be noticeable though but im pretty sure about this.

This sounds like a bug in the system firmware (BIOS), which Debian can't
do anything aobut.

It may help to install the latest BIOS update from:
https://www.dell.com/support/product-details/en-us/product/latitude-14-7400-laptop/drivers

Ben.

-- 
Ben Hutchings
Nothing is ever a complete failure;
it can always serve as a bad example.

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