![]() I can't explain the why, but just how to fix it for this situation. You figure having the extra screen real estate to compute would cause an issue like this, but that is not it. If I disconnect the DisplayPort cable, it immediately starts working fine. If the external monitor is off, the mouse is really laggy and annoying. When the external monitor is on and connected, the mouse works fine. It's funny because the lag problem only occurs when the external monitor is off, but still connected to the iMac. Note: Requires Mini DisplayPort to Mini DisplayPort cable or a converter that converts other electrical, video and audio protocols to DisplayPort compliant signals. ![]() ![]() Return to the iMac screen by pressing Command + F2 on the keyboard. None of which fixed the problem, but the solution turned out to be simple. Use the 27-inch iMac display as an external display for another computer, like a MacBook Pro. I reset the PRAM, made sure the batteries were full (installed the Logitech software which tells you), and updated the firmware for the Logitech receiver. It is a Samsung 24" connected via Mini DisplayPort on iMac to full-size display port on the Samsung monitor. The issue started after adding a second monitor to the iMac. I had the same laggy mouse behavior with a Late 2005 21" iMac and several different mice an Apple Magic Mouse, and a couple of different Logitech wireless ones. Starting to think it is the USB C Adapters (Anker). My work bought one of those expensive 2 USB C port docks but it disconnects the HDMI monitor every 10 seconds and gets REALLY REALLY hot.Īny suggestions / recommendations welcomed.Įdit: Just tried triple shielded HDMI cables. Pushing 2 1080p monitors shouldn't be that hard for this laptop. I have a pair of them at work and home so I don't think it is the dock. I also noticed that these USB C docks get. So I really think it is related to the Anker USB C dock?ĭo you think getting a straight USB C to HDMI cable would solve the mouse lag? Plugging in external drives can cause the mouse lag to occur. Sometimes I have to do this several times to get rid of the mouse lag. When I walk away from my laptop and do a CTRL Command Q and log back in - I have mouse lag until I disconnect the right Anker USB C dock and plug it back in every time. Once it happens, disconnecting the USB C dock is the only thing that fixes it. This mouse lag is happens on the laptop's touchpad, a bluetooth mouse, or a wired gaming mouse. A combination of unplugging the docks and switching them from one side to another results in no mouse lag. I noticed that mouse lag is a real problem sometimes. I have an external drive and a few other minor USB devices plugged in. I'm using Anker USB C docks to HDMI out to 2 1080p monitors. I think I'm experiencing this problem: - Mouse cursor lags with external monitors.
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