Screen resolution changing on its own?!

Ask Fedora
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1

The desktop/MATE screen resolution is sometimes automatically changed to 1024x768 from the original 1920x1080 upon waking up the monitor and screensaver!

I noticed that files in /etc/X11/xorg.conf.d/ no longer seem to take effect. For example, I have

/etc/X11/xorg.conf.d/10-nvidia.conf 
Section "OutputClass"
    Identifier "nvidia"
    MatchDriver "nvidia-drm"
    Driver "nvidia"
    Option "AllowEmptyInitialConfiguration"
    Option "SLI" "Auto"
    Option "BaseMosaic" "on"
EndSection

and to avoid screen tearing:

/etc/X11/xorg.conf.d/20-nvidia-noscreentearing.conf 
Section "Screen"
    Identifier     "Screen0"
    Option         "metamodes" "nvidia-auto-select +0+0 {ForceCompositionPipeline=On}"
EndSection

To compensate, I generated and saved an old-stile xorg.conf config file with nvidia-settings, but I don’t know if it’s always working correctly.

/etc/X11/xorg.conf 
# nvidia-settings:  version 465.27

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"
    # generated from default
    Identifier     "Mouse0"
    Driver         "mouse"
    Option         "Protocol" "auto"
    Option         "Device" "/dev/input/mice"
    Option         "Emulate3Buttons" "no"
    Option         "ZAxisMapping" "4 5"
EndSection

Section "InputDevice"
    # generated from default
    Identifier     "Keyboard0"
    Driver         "kbd"
EndSection

Section "Monitor"
    # HorizSync source: edid, VertRefresh source: edid
    Identifier     "Monitor0"
    VendorName     "Unknown"
    ModelName      "SONY TV"
    HorizSync       14.0 - 70.0
    VertRefresh     48.0 - 62.0
    Option         "DPMS"
EndSection

Section "Device"
    Identifier     "Device0"
    Driver         "nvidia"
    VendorName     "NVIDIA Corporation"
    BoardName      "NVIDIA GeForce GT 1030"
EndSection

Section "Screen"
    Identifier     "Screen0"
    Device         "Device0"
    Monitor        "Monitor0"
    DefaultDepth    24
    Option         "Stereo" "0"
    Option         "nvidiaXineramaInfoOrder" "DFP-1"
    Option         "metamodes" "nvidia-auto-select +0+0 {ForceCompositionPipeline=On, AllowGSYNC=Off}"
    Option         "SLI" "Off"
    Option         "MultiGPU" "Off"
    Option         "BaseMosaic" "off"
    SubSection     "Display"
        Depth       24
    EndSubSection
EndSection

Something really isn’t right!

This is a new issue as of a few weeks. I don’t know if it has to do with Fedora 34, or nvidia drivers, or something else. Perhaps this issue is also related to grub and tty resolutions being low 1024x768 instead of native FHD: Low resolution grub2 and tty

To restore MATE’s desktop screen resolution, I have to open nvidia-settings and change the resolution in there when this issue happens. I have not understood how to consistently reproduce it though. What is going on?