[Magic Trackpad 2 USB-C + bluetooth] Intermittent stuttering and unintended inputs

[Ririshi]

I'm not sure if the title is clear, but I sometimes get a "buffer pile-up" situation where my touch inputs seem to get buffered, delayed for a little bit and then executed very quickly all at once. The cursor will first stop moving, then move around a bunch, often also executing clicks that I did not send. This happens when the stutter happens while I tap-and-hold to move the cursor around, which is being interpreted as multiple individual taps.

I recently installed the new signed version of the driver with bluetooth support, and have been using my MT2 like that since then. It usually works smoothly, but these stutters can cause unintended input, which isn't nice. I don't think I've had this issue on USB, but I admittedly haven't tried it much since installing the BT-enabled version.

I'm not certain that the issue is even in the driver to begin with. It could be in the bluetooth stack on my work laptop, as I also get sound glitches on my bluetooth headphones, which I have not been able to fully resolve so far. I did some research on that topic and one of the causes could be the laptop's BIOS causing fast clock speed and power state switching, causing stutters.
Some Dell thread about a specific (by now outdated) BIOS version causing issues: https://www.dell.com/community/en/conversations/precision-mobile-workstations/precision-7770-bios-1180-overall-system-performance-degradation/65c7802d0217a51eb1a3ebd3

So far, I've tried different power modes in Windows. The "best power efficiency" mode seems to introduce more audio stuttering, while "balanced" and "best performance" have less but still non-zero stuttering. I couldn't see if the trackpad stuttering is affected by this as well.

I saw you don't own this hardware, so I'd be happy to help debug the issue, if it's indeed caused by this driver! Perhaps you could point me in the right direction to figure out if the issue is even caused by this driver to begin with?

Some system specs:

Laptop:           Dell Precision 7770 
BIOS Version:     Dell Inc. 1.36.0, 24/12/2025
OS:               Windows 11 Pro 25H2 26200.8037
WiFi/BT adapter:  Intel AX211
WiFi/BT driver:   BT-24.30.1-64UWD-Win10-Win11

WiFi/BT driver link: Intel website

This screenshot of DPC latency checker does suggest something is causing issues. Sadly, I cannot check individual drivers because LatencyMon requires a license to run on domain-connected machines, and the trial I had used before to troubleshoot the audio stuttering ran out.

[vitoplantamura]

hi @Ririshi, What do you mean by "tap-and-hold" exactly? What's the frequency of the stutters in a day, for example? It could be wireless interference, which can be considered normal if, IMO, it's infrequent and doesn't cause unintentional clicks. Some issues from imbushuo: - imbushuo/mac-precision-touchpad#427 - imbushuo/mac-precision-touchpad#535 Vito PS: Since you have a USB-C MT2, in order to address this issue ( #13 (comment)), can you please open Device Manager and make sure there are no devices with the yellow warning sign? Thanks!

[Ririshi]

With tap and hold I mean I touch the MT2 surface and move my finger around as I usually would to move the cursor. I don't mean clicking by pushing down, just a light touch.

I will keep can eye on this and see how often it happens, and whether other devices have an impact on the stuttering.

Regarding the other issue, I will have a look at it later.

[vitoplantamura]

I asked you about "tap-and-hold," because the MT2 (I mean the hardware) assigns a unique ID to each touch: as long as your finger is in contact with the trackpad, this ID doesn't change. So, with "tap to click" enabled, for example, even in the case of very high DPC latency or other system conditions that slow down the processing of input reports from the MT2, it should be impossible to have accidental clicks. Vito

[MagicUtilities]

It's most likely wireless interference. We see this issue on a regular base. The link offers possible solutions.