Mouse cursor lags with external monitor

I have just solved a similar problem on a 2013 Macbook Air.

This might sound strange, but the problem was the power cable!

I changed the cable from a grounded cable to a ungrounded cable. Using the cable without ground resolved the lagging problem.

Hope this helps someone!

Same problem here with my 27'' imac late 2009 and a brand new Dell U2713H...

The lagging mouse problem happen on each restart. So I have to toggle the DisplayPort 1.2 state on the Delll monitor. Then I'm able to work normally. No problem at all when I boot the imac with windows 7.

We know that on their web site : Dell recommends Windows.

But, please, give me a break !

I have a MBP Mid 2014 attached to an ASUS MX 279 via HDMI and experienced the mentioned mouse lag.

MBP switches automatically to Standard resolution and to "60 Hz (NTSC)".

After switching the monitor settings manually to "50 Hz (PAL)" I do not experience any lag anymore.

Hope that helps!

H1

The solution described here fixed my laggy mouse problems: https://discussions.apple.com/thread/4142259?answerId=22429186022#22429186022

I moved my usb wireless adaptor to the other side of my 2013 macbook pro (away from the HDMI port) and the problem was instantly fixed.

To: Tore

I have a displayport to DVI-D adapter which comes with one of my ATI 7970 display card. I was

able to get to 2560x1080 without the cursor jumping problem. U can try other DVI adapter see if that helps.

only a dual-link DVI adapter can handle 2560x1080 resolution. "DP to DVI-D" adapter only means it's

DVI-Digital. u need "dual-link DVI-D" adapter.

To: JTChris

Your problem seems to be different than the rest of us here.

Ur MBP isn't Haswell HD5000, Monitor is standard FullHD instead of above FullHD. Your problem is very similar to a magic mouse issue which occure much earlier (Maybe two years or even older). I remember read it

somewhere it's related to BT MagicMouse and displayport adapter issue(cursor jump around the screen without pattern). some ppl fix their problem by wrapping "tin foil" around the adapter.

I suggest u look for those thread which should be the root of your problem.

Goodluck guys~

have the same problem here.

OSX 10.9.4

Macbook Pro

Retina, 13-inch, Mid 2014

External monitors at the same time:

1. HDMI port to HDMI display

2. Thunderbolt port to thunderbolt-HDMI adapter to HDMI display

If only one display through HDMI port, everything works fine.

If only one display through thunderbolt-HDMI adapter, mouse lag.

Workaround for me, mouse lagging happens when I start my MBP every time,

after I change the Refresh Rate of the display connecting to thunderbolt (50Hertz to 60Hertz or 60Hertz to 50Hertz), the problem disappears.

(System Preference -> Display -> Refresh Rate)

I found a solution that fixed it for me. I added a USB extension cable (just one I found for cheap on amazon) between the mouse and the computer and I no longer get mouse lag. Worked for my wired mouse and for my wireless logitech.

Good luck!

This solution also fixed it for me. I plugged my mouse into the other USB port (on the right side), and the mouse doesn't lag anymore. Have a Dell U2711 connected via DisplayPort connector. So there does seem to be interference with something.

This worked for me too.

I have : MacBook Pro (Retina, 13-inch, Late 2013), Yosemite 10.10.3, Samsung monitor via HDMI port & a logitech m305 wireless mouse, I switched the logitech usb dongle from the right side of the MBP (which is beside the HDMI port) to the left side USB and the lag has disappeared !

I too have faced this issue (occasional stuttering of input devices when external monitor connected), ever since the days of Mavericks. I can't claim to have a certain fix for it, or even be sure of what's causing it, but this is my theory.

The problem is due to the electrical interface between the monitor and the HDMI port. I believe this because it doesn't happen with every monitor, and I also suspect there may be grounding issues with my monitor. Perhaps it's a fundamental chipset incompatibility, I have no idea (the console log gives no clues). The only way I have found to mitigate this, although this may be coincidental, is to make the connection more secure for the plug on the Mac side of the cable. In my case the weight of the cable is pulling down on the plug, making it angle slightly upward, and perhaps causing a less secure connection for all of the pins. I have placed a piece of cardboard under the plug, thick enough that the plug can only enter horizontally. Whilst I do occasionally do encounter lag, I can now go many days without any problems, and in my case the connection still could be more secure, as it moves too far laterally for my comfort.

I would suggest improvising a way to make the connection as secure as possible, and, if after a few days the incident rate falls, then my suggestions would be

• As short an HDMI cable as is necessary. The longer the cable, the more chance of issues.
• A better cable. My cable was the cheapest eBay cable I could find, and whilst it appears to work, the connection doesn't feel as secure as I imagine it should be.

I should also add that when it does start lagging, you can reset the interface by opening the Displays panel in System Preferences. If more than one refresh rate is available, toggle that. If not, rotate the screen (then immediately revert it). It may require more than one application.

Same problem here with a macbook air 13' Mid 2013 and a dell ultrasharp u2913wm.

It gets fixed by toggling the DDC/CI setting but when it goes on sleep mode it starts over...

I rearranged my work desk, and opened the MBP's lid instead of having it in clamshell. ...it is now all just fine. Not logical though...

Yes, toggle the "Displayport 1.2" option in the monitor's menu temporarily fix this issue...until u switch off the monitor or reset the screen. 😟

Hope someone from apple notice this thread and put some resource to fix this.