macOS 10.15.5 broke mouse pointer location on vertical display

hey guys, I have solved this problem by replacing the GPU, was RX 5700 XT, now RX 580-8GB. Just in case some of you using mac Pro or external GPU, another GPU may be a way to go. I think the problem might be something wrong with navi10 driver.

I have the exact same issue and have had it repro across two totally separate machines. What is odd is it seems to only happen when I'm using two monitors at the same time, but I feel I recall some times in the past when the issue was present with only a single monitor. I even get the issue with my monitors in standard orientation! This issue has taken several years of my life, I literally have to live with it 10+ hours a day because I have no alternative and I'm losing my mind.

I have tried:

• resetting the PRAM/SMC
• trying every orientation/resolution
• trying different ports, cables, inputs, etc.
• different mice (built-in trackpad, wired mouse, wireless, magic trackpad)

It really just seems the culprit is 4k scaled resolution.

This issue has been around since at least Mojave. It was an issue in Catalina, and is still around in Big Sur.

I am experiencing the exact same issue:

1. Macbook Pro 16-inch, 2019 -- AMD Radeon Pro 5500M 4GB
2. OS X 10.15.6
3. 27.5" Dell u2718q rotated 90º oriented to the left of my main monitor

I've reset the SMC, rotated 270º, changed cables multiple times, nothing changed.

The only "workaround" for me has been to use the "Default for display" resolution. But the text is difficult to read in this mode.

Same issue with an iiyama Prolite XUB2792UHSU 4k 27" monitor. It only occurs with non-default scaling but the default scaling makes the text far too large on this monitor. I see the cursor briefly disappear about an inch from the right side of the screen.

I have the same issue since Spring 2020

As more and more people complain about it a very dangerous pattern is emerging - every single use experiencing this issue is using MBP 16".

This combined with the unbelievable fact that such a nasty bug is not solved for over 6 months now spells hardware problem, possibly with early MBP 16" graphics cards.

What do you say Apple? it's normal to expect that such a basic feature as a monitor works faulty for over 6 months or are you going to replace our hardware already?

Pedro

In fact, I first noticed this issue while I was using a mac mini 2018. I thought it could be a hardware problem because I was using an e-gpu. But I replicated the exact same bug but using a new mac16” with the same monitor setting. As one who writes code for living, I believe it is a software issue. And it feels bad that apple still has not fixed it. In a few days, Big Sur will be released. I hope they fixed it over there.

That is very comforting to hear, a quick survey shows only MBP16 complaints. I also write code for a living and this kind of error sounds too simple to fix for the time taken.

on top of that the error is only logical, if your output device is not a physical monitor, but a video stream it doesn’t happen which further points to hardware.

on the other hand the issue does not present itself if the screen is not scaled or if scaling is perfectly doubled which hints on software bug.

I don’t know if you have noticed but if you take a screenshot of your screen (which is another form of logical output) the image resolution is 2x larger both horizontally and vertically if scaling is on (the three middle scaling settings on your display) but it is the accurate height and width if not scaled or fully doubled (the 2 edge options on your scale settings)

I assume this is used as a trick to add software anti-aliasing due to the non discrete nature of the scale.

that also hints on software, however using the CPU to process this does not sound very promising from an energy point of view.

Nov 15 with fresh Big Sur (11.0.1, v20B29) installed but still have save bug with MBP 16 inch and iMac 27inch 2020. Both U2720Q and U3129Q have same this f..ing annoying issue. How many time Apple dev need to fix this simple bug? 1 years? **** or never I think....

Really? I'm already with 11.0.1 (20B29) and this problem still there. Nothing was Fixed

Both 4K monitor display same bug when I change display rotation to 90 or 270.

And this bug will appear when you change resolution from default to any other scale resolution. Don't forget that.

Here, you can see my cursor disappeared.

For more detail, just watch my video I uploaded to Youtube.

https://youtu.be/MbEKwO7BtNU

I am running macOS Big Sur 11.1 (20C69) on my 16'' MacBook Pro, (not using internal display) only on 2 external 4k monitors (one horizontal, one vertical) both at 2560x1440 HiDPI.

Had the same issue on the vertical display. Cursor disappear when move close to bottom area, shifted a bit, and appear again below it.

The interesting bit of this bug is that, if you record the screen via the macOS built-in screen record tool (cmd + shift + 5), everything from the generated video looks fine, but obviously you can see the cursor acting weirdly directly from the screen.

https://youtu.be/1iXcp6As00E

Hello bro, I'm already tested with other GPU and posted my result here

https://discussions.apple.com/thread/251477304?answerId=253890280022#253890280022

And the main problem is me and other peoples are using iMac or MBP not Mac Pro.

I'm posted temporary fix too without replace GPU, but you need to do it every times you start your mac.

I would like to add that I also have this problem. It occurs when both of the following are true

1. Display is set to a scaled resolution
2. Rotation is enabled (in my case usually 180°)

Therefore, it's not only in vertical mode, but also in 180° rotation (which is necessary for me because of my display mounts).

The aforementioned strategy to mitigate the issue is not working for me.

Same problem with me. With resolution as "default" the problem is not there. It only happens when you are using "scaled" resolution. Super annoying.

Does anyone have any solution?