Issues saving Nvidia settings

Support Graphics & Display
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Ok, so you have a Desktop PC with iGPU from AMD + dGPU Nvidia GeForce GTX 750 Ti. Your monitor is connected to dGPU and you can’t set the maximum performance.

We can try this:

  • disable iGPU from BIOS, but, if you plan later to use that as passtrough or attach more screens to it, i think that might not be what you want.
  • depending what you will want, there might be a need to tweak the conf file
  • to get things work better with the dGPU and since you use KDE Plasma, this is my proposal:

Test this for /etc/X11/mhwd.d/nvidia.conf but make sure you backup yours, so you can restore it if something goes wrong:

# nvidia-xconfig: X configuration file generated by nvidia-xconfig
# nvidia-xconfig:  version 450.66

Section "ServerLayout"
    Identifier     "Layout0"
    Screen      0  "Screen0" 0 0
    InputDevice    "Keyboard0" "CoreKeyboard"
    InputDevice    "Mouse0" "CorePointer"
    Option         "Xinerama" "0"
EndSection

Section "Files"
EndSection

Section "Module"
    Load           "dbe"
    Load           "extmod"
    Load           "type1"
    Load           "freetype"
    Load           "glx"
EndSection

Section "InputDevice"
    Identifier     "Mouse0"
    Driver         "mouse"
    Option         "Protocol" "auto"
    Option         "Device" "/dev/psaux"
    Option         "Emulate3Buttons" "no"
    Option         "ZAxisMapping" "4 5"
EndSection

Section "InputDevice"
    Identifier     "Keyboard0"
    Driver         "kbd"
EndSection

Section "InputClass"
    Identifier         "Keyboard Defaults"
    MatchIsKeyboard    "yes"
    Option         "XkbOptions" "terminate:ctrl_alt_bksp"
EndSection

Section "Monitor"
    Identifier     "Monitor0"
    VendorName     "Unknown"
    ModelName      "CRT-0"
    HorizSync       28.0 - 55.0
    VertRefresh     43.0 - 72.0
    Option         "DPMS"
EndSection

Section "Device"
    Identifier     "Device0"
    Driver         "nvidia"
    VendorName     "NVIDIA Corporation"
    BoardName      "GeForce GTX 750 Ti"
    Option         "TripleBuffer"  "On"
    Option  "ConnectToAcpid"    "Off"
    Option  "Coolbits"   "12"
EndSection

Section "Screen"
    Identifier     "Screen0"
    Device         "Device0"
    Monitor        "Monitor0"
    DefaultDepth    24
    Option         "Stereo" "0"
    Option         "nvidiaXineramaInfoOrder" "CRT-0"
    Option         "metamodes" "1368x768 +0+0 {ForceCompositionPipeline=On}"
    Option         "SLI" "Off"
    Option         "MultiGPU" "Off"
    Option         "BaseMosaic" "off"
    SubSection     "Display"
        Depth       24
    EndSubSection
EndSection

Section "Extensions"
    Option         "COMPOSITE" "Enable"
EndSection

 
Section "InputClass"
    Identifier          "Keyboard Defaults"
    MatchIsKeyboard        "yes"
    Option              "XkbOptions" "terminate:ctrl_alt_bksp"
EndSection

Since i added the Option "TripleBuffer" "On" in the Section "Device" then, for KWin to use it, we create the kwin.sh file in the correct place with this command from terminal:
echo "export KWIN_TRIPLE_BUFFER=1" | sudo tee /etc/profile.d/kwin.sh
Reboot and if that doesn’t help, then modify /etc/profile.d/kwin.sh to be like this:

export KWIN_TRIPLE_BUFFER=1
export __GL_YIELD=USLEEP
export __GL_MaxFramesAllowed=1

If i’m not mistaken, if you want to use PowerMizer to maximum Performance, you have to enable Coolbits, so i added that too.

Once you have done this changes, run this command:
sudo mhwd-gpu --setmod nvidia --setxorg /etc/X11/mhwd.d/nvidia.conf

Then reboot.

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Lag in KDE with NVIDIA