Mouse problems with display port 1.2 in MST (4K display)

Hi,

Same problem with a DELL UP2414Q and a MBPr 15" late 2013. I had an earlier MBPr 15" and I changed it to this model just due to support of 4K 60Hz display via TB2/DP1.2, it is very disappointing Apple handles professional users with this lack of care.

Very bad for the answer given so far, hope on the one who opened developer case towards apple, I assume this is the only way to get it solved by apple maintenance group, I will open another case if not solved soon.

BR.

Same here. Newest 10.12.3 Beta (16D30a), MacBook Pro 15" Late 2013, DELL UP2414Q.

My workaround is changing the resolution from (virtual) 1920x1080 to 2304x1296 and then back to 1920x1080.

Mostly i have to repeat this steps three to five times until the bug is gone. Very annoying.

Still very annoying, but the trick above works every time, given that the display is put to sleep by the hot-corner, and even if you wake it up by a keystroke (you can ignore step 4). All other suggestions have either not worked at all or given inconsistent results. Apple, please...

My problem looks like it's fixed after the update. The problem with mine was the cursor would change as i slid the mouse to the left part of the screen, and it would change right over the halfway point of the monitor. It's been a couple of hours since i've updated.

My hardware is 980ti on a mac pro with Dell UP2715K

I'll update the status tomorrow morning, after a full night of sleep.

But so far it looks good,

Nick

Unfortunately that's what i imagined... starting to get the feeling that APPL will not solve this intentionally. It might disappear eventually with some new drivers or other changes, but they don't seem to acknowledge the issue or do anything about it.

I even remember a few years ago when I had to manually edit and replace kexts and fix system files because they botched the graphics drivers for a few consecutive .x updates.... Not to mention the wifi in the first versions of El Capitan.

I believe this is very display specific, definitely doesn't show on all 4K displays driven over DP1.2 MST. Doesn't even show on all displays from the same mfg and the same line of panels.

In my case the problem is there on DELL UP2414Q at home but is absolutely fine on DELL UP3216Q at work.

Point being, the problem is not uniform and any potential fix may or may not work for some depending on the Mac/GPU/Panel harness...

Yep, this is what I mean exactly. It is a hit and miss. My mid 2014" MBP is totally fine with your UP3214Q and your late 2013 MBP is not. I also tried some random LG 4K panels I've managed to find in the office and those worked fine over 1.2 MST 60Hz.

This was after 10.12.3 update, and this morning still ok.

The only thing i did different with this update was I ran the mac-pixel-clock-patch-V2 for Nvidia cards and intel GPU. This patch makes 4K/3840x2160/UHD/2560x1080/3440x1440 resolutions possible on older macs over both HDMI and DisplayPort. Was it something apple fixed, was it the new nvidia driver or maybe the patch I ran to fix my HDMI tv.

All i know is that the problem would show up 30 seconds after waking from sleep, and it's done the sleep wake cycle at leasts 5 time and I have yet to see the problem.

The patch

https://github.com/floris497/mac-pixel-clock-patch

The problem came back after i restarted the system. The patch did nothing....

Not sure why everything was working fine after the update, sleep did not break the mouse.... it woke and slept 4 to 5 times,

This morning i decided to reboot, and the problem came back....

After a second reboot, everything works again....

so no idea what happened on the previous boot.

as far as 5K screen, i would stay with el-cap. I seem to be the only one who has success with this and it's a bit flakey at best.

Guys, the mouse pointer is NOT a hardware issue. The issue appears on the boundary of the MST split and also it appears to show the "last" pointer so its very likely an issue with some kind of memory allocation issue where the osx gui render engine is caching the pointer and isn't updating it properly for the two screen halves.

I have several monitors hooked up and the cursor is correct on all screens except the right half of my MST display. The mouse pointer icon isn't "updated' each tick, instead it updates when there are mouse events that trigger the icon change.

If the problem isn't happening for you, great, but don't claim this is a hardware issue and try to dismiss this issue as that gives Apple ammo to ignore this critical issue. The rest of us are actually suffering from this problem and I seriously hope it gets resolved as professional graphics / CAD is nearly impossible with this kind of problem.

In 10.12.4 Beta (16E175b) it's still NOT solved...

Looks like this will not be solved. It looks now that Apple will not willingly fix this. Either engineers are not aware of this or it simply doesn't affect too many people to be "significant" enough.

The only hope is that maybe someday other changes might mitigate this issue.

Very sad, as it mainly affects working professionals.

Thats so frustrating to hear, I was hoping it would be fixed in the latest beta. I just submitted a bug report about this but I doubt it will do anything.

Apple says they care about professionals but they really don't!!

Same here

Dell 4K (UP2414Q)

Worked in El Capitain but had the problem in Sierra

Seems like a software bug, where the cursor after exactly 1/2 of the width uses a cached version of the cursor icon. Likely something to do with 4K (and as some suggest 60Hz).

Update -- found a usable fix:

If I set the MacBookPro internal display resolution to 1680x1050, the problem disappears on my Asus PQ321 4K display.

Setting the internal display to 1440x900 immediately triggers the strange behavior again.