10.14/10.15 RX580 Mouse LAG with 3 monitors.

Virgo

New member
May 22, 2020
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Hi guys.
With 3 monitor when I do Drag'n'Drop, a terrible mouse lag occurs.
With 1 monitor lag almost invisible, but exists.
Does everyone have this?

Ryzen 9 3900X | MSI B450M MORTAR MAX | RX580 | Mojave 10.1.4.6 or Catalina 10.15.4 | OC 0.5.8 | 3 Monitors.

Mouse Lag.gif
 

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Virgo

New member
May 22, 2020
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I left only VirtualSMC, Lilu, WhateverGreen and nothing.
I tried different graphics cards RX460, RX480. RX580, and same problem.
May be problem with PCI-E motherboard, don't known.
 

discordt

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May 27, 2020
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What cables are you using? And what resolutions? I heard some people have mouse lag issues with HDMI connection to 4K monitor.
 

discordt

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May 27, 2020
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I have mouse lag too, but it looks horrible when cursor is changing. Cursor is slowing down:

Some people solved this issue by switching to DisplayPort cable and changing DisplayPort Version to 1.1 (right on the monitor), but it's not working for me.
 

Virgo

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May 22, 2020
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What cables are you using? And what resolutions? I heard some people have mouse lag issues with HDMI connection to 4K monitor.
2 HDMI, 1 DVI. All monitors 1920x1080.
May be 10.15.5 solved this issue.
 

discordt

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May 27, 2020
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So, I have clean install Catalina 10.15.5, but the problem is still there. Cursor is lagging when it came across text (usually in Telegram like in the video above), and lagging when I do drag and drop links in Mail application.

I also noticed, that cursor sometimes is slowing down, and when it happens my sound is crackling a little. When I call someone (Skype for example) my mic is also crackling (and my partner hear the sound like you unplug and plug back 3.5 jack).

I tried to change boot args, tried to remove some kexts, tried to boot without WEG, tried to make USB map, tried to replace mouse, but nothing did help. It's only better, when I unplug my 4k monitor and use only one 1080p, but the problem don't want to go away completely.

Here the full specs:
CPU: Ryzen 5 3600
GPU: Sapphire RX 580 PULSE
Motherboard: ASUS B450 PRIME PLUS
RAM: Corsair LPX 16 GB 3200Mhz
ADATA XPD NVMe 250 GB and SSD Samsung EVO 500 GB (tried to install Catalina on both)
Dual monitor setup: [email protected] and [email protected]

Do you have any updates @Virgo ? I hope you found a solution :D
 

Virgo

New member
May 22, 2020
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I am more and more inclined to think that the problem is in the AMD processor. Apple may be using some kind of Intel processor instructions. Perhaps a kernel patch has not been found that can fix this.
 
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RyzeCooker

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May 3, 2020
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If you have the option in your bios, try setting the pci generation from 4 to 3. It seems to fix all kinds of lagging problems (in my case, stuttering audio in my external usb Focusrite sound card).
 
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discordt

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May 27, 2020
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If you have the option in your bios, try setting the pci generation from 4 to 3. It seems to fix all kinds of lagging problems (in my case, stuttering audio in my external usb Focusrite sound card).
Thank you for your reply, but I havn't PCI 4. It seems only 3.0 and below.