Jittery cursor on video playback when external display is in HiDPI mode (with and without the app running)?

[AM-ash-OR-AM-I]

Description

While video playing on built-in display the cursor stutter/lags in external monitor

Reproducing

To reproduce this issue:

• Turn on high-resolution toggle in external monitor
• Play any video/animation (or just the attached video) in the macbook display and hover mouse in external monitor.
• There's a visible jitter/cursor shake and it stops as soon as video is off.

Screen.Recording.2024-01-30.at.9.40.11.PM.mov

Device info

Model: Macbook Air M1
Version: MacOS Sonoma 14.3

NOTE: It works fine as soon as high-resolution (Hi-DPI) toggle is turned off, or the cursor is moving

[waydabber]

Interesting. Never seen anything like this. Can you share a bit more about the setup? Does this still happen if you exit the app?

[AM-ash-OR-AM-I]

Interesting. Never seen anything like this. Can you share a bit more about the setup? Does this still happen if you exit the app?

No it doesn't happen when i exit app in-fact as mentioned in the issue it disappears if i turn off Hi-Dpi toggle in better display toolbar, issue only appears when i've turned on this toogle.

The setup is very basic 21" 1080p monitor connected to macbook via USB-C Hub HDMI port

[waydabber]

I mean you leave HiDPI on and exit the app - HiDPI should be available after exiting the app. Or how did you activate HiDPI? Are you using virtual screen mirroring (which requires the app to run continuously) and not smooth scaling?

[AM-ash-OR-AM-I]

I mean you leave HiDPI on and exit the app - HiDPI should be available after exiting the app. Or how did you activate HiDPI? Are you using virtual screen mirroring (which requires the app to run continuously) and not smooth scaling?

Okay my bad for not making it clear, if Hi-DPI mode is turned on irrespective of whether app is running or closed the stuttering is present. If the mode is turned off then issue isn't present.

Ans yes I activated HiDPI after running app (also kept run at login turned on)

[waydabber]

I see. Well, it means that the stuttering is not because of the app is doing something fishy in the background which is good news. :) However the bad news is that if the app is not running, this seems to be a generic macOS issue when the desktop is supersampled using HiDPI or some other app somehow interfering with something and I have no clear idea why this is happening. :(

I see you are using various apps/utilities, some which might affect the mouse (at least I see a mouse icon in the toolbar). You might want to start trouble-shooting to see if you disable any or all of them the issue still persists and what makes it reappear if you can make it go away.

Sorry for not having a better recommendation about this.

[waydabber]

(but I'll move this to discussions, maybe others can chime in with a similar experience?)

[AM-ash-OR-AM-I]

I think you are correct about it being macos issue i can see it happening even when i have it HiDPI disabled it still stutters for "hand" cursor, but when i went to record in quicktime showed stutter for all the cursors (not what i saw in naked eye), also tried disabling all utilities didn't help

[aghwotu]

Hey @AM-ash-OR-AM-I did you ever get to the bottom of this? What was causing this challenge?