VM scrolling locks up

[jtran19]

Describe the issue
When scrolling quickly (flick on a Trackpad) or near the ends (top/bottom) of a page, the UI locks up for 5+ seconds. Most noticeable in vscode-insiders, but also happens in Google Chrome.

Update 1: Scrolling with a mouse (Logitech MX Master 2S) works without issues or lock ups.

Configuration

• UTM Version: 4.1.0¹
• macOS Version: 13 (Ventura)
• Mac Chip (Intel, M1, ...): M1

Upload VM
config.plist.zip

Footnotes

1. Issue also occurs in 4.0.7, 4.0.8 and 4.0.9, but not as noticeably. When it does happen in these versions, the lock up is not as easily triggered and does not last as long. ↩

[osy]

This is likely an Apple issue and would be difficult to debug on our end.

[jdork0]

I think this is being caused by this commit: 6d66612

I have macOS 13.1 with a macOS 13.1 guest running on an M2 MacBook Air. I don't see any problems before release 4.0.6 and if I rebuild the latest code without this change, I no longer see the issue.

Edit: Seems like this problem is only visible when using my bluetooth Magic Trackpad (connected to the host). If I turn off bluetooth and use the built-in trackpad on my laptop, then I can't re-create this.

[jtran19]

FWIW, I am using a bluetooth connected Magic Trackpad. However, it does also happen to me when I'm using the built-in trackpad on my 2021 MBP 16".

[jdork0]

Tried again and I was wrong. It does still happen with the built in trackpad. I reverted to UTM v3.2.4 as it has no problems for me.

@osy, any chance the trackpad config can be made optional? macOS VMs on arm Macs are unusable for me with this issue.

[jtran19]

I'm not sure what the added trackpad feature was in v4. I don't have the Trackpad settings option in my System Settings.

[jtran19]

Installed the latest beta (4.2.0) and the scrolling issues have been resolved for me. Doesn't feel like scrolling in the host OS, but it's not locking up anymore. However, I'm having the right-click issues described by #4645. Going on memory...I think UTM v3 had the click issues, but they were resolved for me in v4.0.x and v4.1.x.

Sometimes when I right-click, the following sequence occurs:

1. nothing happens, I right-click again
2. nothing happens, I right-click again
3. context menu appears
4. context menu disappears when I move my cursor onto it to select from the menu
5. I right-click again
6. context menu appears
7. I can now select from the menu

Doesn't happen all the time, but it reliably happens every time I type, stop typing, right-click without first moving the cursor. I'll try to find a 100% reproducible pattern.

[osy]

@jtran19 how is your right click configured? Is this on a trackpad or mouse or Magic Mouse?

[osy]

Okay, I think I was able to reproduce it and this new commit seems to fix it. Let me know after the next update.

[jtran19]

@jtran19 how is your right click configured? Is this on a trackpad or mouse or Magic Mouse?

In my host OS, I have
Secondary Click = "Click with Two Fingers"
Tap to click = disabled

In my VM, I only have mouse settings (no trackpad):

This happens on trackpad (Magic Trackpad and built-in MacBook Pro trackpad). No scrolling/clicking issues when I use my Logitech MX Master 2S. I don't have a Magic Mouse to test with.

Also, is there supposed to be some kind of "trackpad config" in the VM settings? This is the only thing I see related to input devices:

[jtran19]

I can confirm v4.2.1 fixes the click issue for me (#4645) but breaks scrolling on trackpad.

[osy]

@jtran19 so if I understand correctly, scrolling issue fixed -> click issue and click issue fixed -> scrolling issue? Basically there’s no way to fix them both at once?

[jdork0]

@osy I've seen the same thing playing with the code. VZMacTrackpadConfiguration will fix the click issue, but it causes the scroll issue.

[jtran19]

I have not looked at the code, but if it's a single change for both issues, then I don't see how they could both be fixed at once. Perhaps a current limitation in the Apple visualization library?

[jtran19]

Ok, looking at what you did in commit ae8cce8 and some quick Googling on VZMacTrackpadConfiguration, I don't think the 2 issues can be fixed at the same time if they're both related to the pointing device that the VM is configured with.

[osy]

Okay would you agree that fixing click issue is higher priority than fixing scrolling issue? I’ll file a feedback with apple in the meantime.

[jdork0]

You can work around the click issue by holding down control while clicking. When it locks up scrolling you're stuck until it comes back.

[jtran19]

While there might be a workaround for the click issue, I'd prefer to have the click issue fixed over the scroll issue. I can use a mouse to avoid the scroll issue, but the click issue results in selecting unwanted options from the context menu.

[osy]

Filed FB12073793 with Apple

[wizzard0]

Can confirm 4.2.2 (78) no longer locks up. Scrolling is subtly different from the native one, and sometimes lags for ~0.1-1s before the scrolling starts, but finally usable (4.1.6 was locking up like every minute for 20s). Thanks a lot 🙇

UPD: So far I don't observe the issue with clicking, either.

UPD2: Scrolling lockups are back. Can't say I changed something specific :(

[wizzard0]

Minor annoyance: if you use the VM in a window, the scrolling might \appear\ to be locked up because it seems that the VM doesn't capture scroll events when defocused, unlike other apps where I can hover and scroll without activating the window.
But if you click first, everything works.

Don't remember if this was the case with 4.1.6.

[osy]

Reply from apple:

Thank you for your message. Upon further review, we require additional files to help us investigate your feedback. Please reproduce the issue, provide a screenshot/screen recording, capture a sysdiagnose, and use Feedback Assistant to gather the requested file.

Can someone provide this?

[ThomDap]

Any update ? Can't barely use macOS 13 VM on M2

[tenedor]

I've been having the same issue for months, running MacOS 13.5 in UTM 4.4.4 on M2. Scrolling within the VM freezes the VM for 10+ seconds, particularly scrolling in certain apps like VSCode. Is this simply the expected behavior at this point, or is there a workaround I can use?

[Dan2552]

Still an issue on Version 4.5.4 (100)

also #5254 is the same issue

[robreuss]

I'm also experiencing the scroll issue on 4.5.4 using the Apple Magic Mouse.

CORRECTION: I was experiencing it a lot and thought I would try adjusting the scroll speed in the guest - knocked it up by one increment. I've been unable to reproduce the problem after a bunch of effort. However, given how intermittent the issue can be, could just be a coincidence.