Problem with stuttering and refresh rate on dual monitor setup.

Hi people,

So I have just installed Manjaro KDE Plasma for the first time and I ran into a problem.
I am running dual monitor setup, one is 1080p 75hz and the other one is 1080p 60hz.
The problem is that on my 60hz monitor everything is smoother than on 75hz one. I have set it to 75hz in settings but when I am dragging any kind of window on the screen its not smooth, kinda like its set on 60 hz but its not. Only way I managed to fix the problem is by unplugging my 60hz monitor. Then everything is smooth and nice, but as soon as I connect my other monitor its not smooth again. I could not find the fix anywhere on the forum.
Any kind of help would be appreciated.
Also Mozilla Firefox is capped at 60fps is that fixable?
Thanks

Here is my inxi -Fx

System:    Host: Biki Kernel: 5.6.7-1-MANJARO x86_64 bits: 64 compiler: gcc v: 9.3.0 Desktop: KDE Plasma 5.18.4 
           Distro: Manjaro Linux 
Machine:   Type: Desktop Mobo: ASUSTeK model: H110M-C v: Rev X.0x serial: <filter> UEFI: American Megatrends v: 4212 
           date: 07/24/2019 
CPU:       Topology: Dual Core model: Intel Core i3-6100 bits: 64 type: MT MCP arch: Skylake-S rev: 3 L2 cache: 3072 KiB 
           flags: avx avx2 lm nx pae sse sse2 sse3 sse4_1 sse4_2 ssse3 bogomips: 29608 
           Speed: 800 MHz min/max: 800/3700 MHz Core speeds (MHz): 1: 800 2: 800 3: 799 4: 800 
Graphics:  Device-1: NVIDIA GP106 [GeForce GTX 1060 6GB] vendor: Micro-Star MSI driver: nvidia v: 440.82 bus ID: 01:00.0 
           Display: x11 server: X.Org 1.20.8 driver: nvidia resolution: 1920x1080~60Hz 
           OpenGL: renderer: GeForce GTX 1060 6GB/PCIe/SSE2 v: 4.6.0 NVIDIA 440.82 direct render: Yes 
Audio:     Device-1: Intel 100 Series/C230 Series Family HD Audio vendor: ASUSTeK driver: snd_hda_intel v: kernel 
           bus ID: 00:1f.3 
           Device-2: NVIDIA GP106 High Definition Audio vendor: Micro-Star MSI driver: snd_hda_intel v: kernel bus ID: 01:00.1 
           Device-3: C-Media CMI8738/CMI8768 PCI Audio driver: snd_cmipci v: kernel bus ID: 05:00.0 
           Sound Server: ALSA v: k5.6.7-1-MANJARO 
Network:   Device-1: Realtek RTL8111/8168/8411 PCI Express Gigabit Ethernet vendor: ASUSTeK driver: r8169 v: kernel port: c000 
           bus ID: 07:00.0 
           IF: enp7s0 state: up speed: 1000 Mbps duplex: full mac: <filter> 
Drives:    Local Storage: total: 689.33 GiB used: 8.04 GiB (1.2%) 
           ID-1: /dev/sda vendor: Western Digital model: WD5000AAKS-00UU3A0 size: 465.76 GiB 
           ID-2: /dev/sdb vendor: Gigabyte model: GP-GSTFS31240GNTD size: 223.57 GiB 
Partition: ID-1: / size: 19.10 GiB used: 8.04 GiB (42.1%) fs: ext4 dev: /dev/sdb5 
Sensors:   System Temperatures: cpu: 29.8 C mobo: 27.8 C gpu: nvidia temp: 45 C 
           Fan Speeds (RPM): N/A gpu: nvidia fan: 0% 
Info:      Processes: 173 Uptime: 32m Memory: 7.72 GiB used: 1.46 GiB (18.9%) Init: systemd Compilers: gcc: 9.3.0 Shell: bash 
           v: 5.0.16 inxi: 3.0.37

:+1: Welcome to Manjaro! :+1:

Can you also provide us with a xrandr output, please?

:innocent:

Sure here it is,

Screen 0: minimum 8 x 8, current 1921 x 2160, maximum 32767 x 32767
DVI-D-0 disconnected (normal left inverted right x axis y axis)
HDMI-0 connected 1920x1080+1+0 (normal left inverted right x axis y axis) 480mm x 270mm
   1920x1080     60.00 +  59.94* 
   1680x1050     59.95  
   1280x1024     75.02    60.02  
   1280x720      59.94  
   1152x864      75.00  
   1024x768      75.03    60.00  
   800x600       75.00    60.32  
   720x480       59.94    59.94  
   640x480       75.00    59.94  
DP-0 connected primary 1920x1080+0+1080 (normal left inverted right x axis y axis) 544mm x 303mm
   1920x1080     60.00 +  74.97*   59.94    50.00  
   1680x1050     59.95  
   1440x900      59.89  
   1280x1024     75.02    60.02  
   1280x960      60.00  
   1280x720      60.00    59.94    50.00  
   1024x768      75.03    70.07    60.00  
   800x600       75.00    72.19    60.32    56.25  
   720x576       50.00  
   720x480       59.94  
   640x480       75.00    72.81    59.94    59.93  
DP-1 disconnected (normal left inverted right x axis y axis)
DP-2 disconnected (normal left inverted right x axis y axis)
DP-3 disconnected (normal left inverted right x axis y axis)
DP-4 disconnected (normal left inverted right x axis y axis)
DP-5 disconnected (normal left inverted right x axis y axis)

Both support 60Hz. Can you try setting both to that refresh rate please and see if that makes the issue go away???

:innocent:

I think that you didnt understand my problem, or maybe I did not explain it as well. Anyways the issue is that my 75hz monitor is set to 60hz even though it says 75 in settings. I know its set to 60 because I can see the difference. It works at 75hz only when the other monitor is disabled or unplugged.
Is it even possible to run two monitors with different refresh rates?

Yes! :innocent:

No, it's not:

(the * denoting the frequencies in use)

Can you show a screenshot where exactly you set the monitor in 60Hz mode manually, please?

:grin:

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