@iTris6666 : Check my reddit post on this where I documented what I tried. But to make it short: I do not think it is hardware related and I do believe it is fully macOS software-related. I have a MacBook Pro M1 2020 13" which was affected just after upgrading to macOS 15. After downgrading back to macOS 14 it was working again.
This week I received a MacBook M4 Pro 14" which had macOS 15 out of the box. It had the same issue as well. I put both devices side by side (macOS 14 vs macOS 15) and filmed it. The documentation is uploaded to apple and a supervisor of the German Apple Support sent two forms (Bug reports) to Cupertino: The first form contains the information about the trackpad bug under macOS 15 (including a link to this post, to the reddit post, a 3min video to reproduce the issue, and my system diagnostics + both .plist files under macOS 14 and macOS 15). The second form contains a question to manually transplant the AppleMultitouchTrackpad Driver from my macOS 14 device to the macOS 15 device.
Some more Information on what can be done at the moment
If you want to fiddle around and check if you can find a solution, you can try editing the
In the .plist there are several hidden settings e.g. you can set your Trackpad to have secondary-right click on the bottom-right AND bottom-left corner by editing the TrackpadCornerSecondaryClick (it goes up to "8") 1 is bottom-left, 2 is bottom-right if I remember correctly. You can try something like.
When you click in the macOS Trackpad Settings UI it will override the .plist again, so do not make changes in the UI and only the .plist if you try this. You should also copy-paste the original .plist to have a duplicate in place if you mess around here.
I tried a lot of different setting combinations but none achieved the effect to resolve the issue. So my guess is, we have to wait for Apple to update the AppleMultitouchTrackpad Driver
The driver should be located here (I think this should be it)
Drivername
So these are my breadcrumbs, maybe someone else has further ideas.
This week I received a MacBook M4 Pro 14" which had macOS 15 out of the box. It had the same issue as well. I put both devices side by side (macOS 14 vs macOS 15) and filmed it. The documentation is uploaded to apple and a supervisor of the German Apple Support sent two forms (Bug reports) to Cupertino: The first form contains the information about the trackpad bug under macOS 15 (including a link to this post, to the reddit post, a 3min video to reproduce the issue, and my system diagnostics + both .plist files under macOS 14 and macOS 15). The second form contains a question to manually transplant the AppleMultitouchTrackpad Driver from my macOS 14 device to the macOS 15 device.
Some more Information on what can be done at the moment
1. Editing the .plist which stores the settings for your Trackpad
If you want to fiddle around and check if you can find a solution, you can try editing the
which is located under Macintosh HD > User > Username > Library > Preferences. Go to Foldercom.apple.AppleMultitouchTrackpad.plist
and fill in your username for "YourUserName". After editing the .plist you have to restart the device (or use a terminal command that restarts the process, which I do not know) to have the changed become effective./Users/YourUserName/Library/Preferences
In the .plist there are several hidden settings e.g. you can set your Trackpad to have secondary-right click on the bottom-right AND bottom-left corner by editing the TrackpadCornerSecondaryClick (it goes up to "8") 1 is bottom-left, 2 is bottom-right if I remember correctly. You can try something like.
<key>TrackpadCornerSecondaryClick</key>
<integer>5</integer>
When you click in the macOS Trackpad Settings UI it will override the .plist again, so do not make changes in the UI and only the .plist if you try this. You should also copy-paste the original .plist to have a duplicate in place if you mess around here.
I tried a lot of different setting combinations but none achieved the effect to resolve the issue. So my guess is, we have to wait for Apple to update the AppleMultitouchTrackpad Driver
2. Looking at the Multitouch Driver
My guess is this is the exact root issue.The driver should be located here (I think this should be it)
Drivername
underAppleMultitouchDriver.kext
However, I cannot find anything specific there or it is hidden for me. I also cannot replace that file with the same file that I have under macOS 14 (which would solve this I think). Editing System Library Extensions is not allowed for standard users (or maybe someone knows a way to do this?)/System/Library/Extensions
So these are my breadcrumbs, maybe someone else has further ideas.