What is happening? Is it a recent kernel regression?
We can only speculate with the information given. Does the touchpad keep working if detected at boot? Only happens when connected to a charger, on battery, or randomly? Does it ever start working after a few minutes if not detected initially at boot? The quality of Dell is questionable.
Many such issues if you search…
https://www.reddit.com/r/Dell/comments/eyg6jd/dell_latitude_5400_touchpad_issues/
You could test behaviour with a live distro running an older kernel
Sometimes when i boot up it doesn’t detect it, and sometimes i have to reboot in order for it to be detected. And sometimes when it boots up it is detected.
You didn’t answer all the questions. It could be a possible hardware fault, but as suggested before you could try testing with a live distro.
It happens randomly, whether connected to a charger, or on battery.
I haven’t tested if it works a few minutes after as i often reboot if it doesn’t work.
One of many similar threads
https://www.reddit.com/r/Dell/comments/p4kesm/anyone_experiencing_touchpad_problems_on_his/
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