The primary screen doesn't show the wallpaper nor the contextual menu

[kiamlaluno]

I re-installed EOS with Plasma instead of MATE. It’s all worked fine, once I changed the kernel parameters to resolve the issues I had.

Now, when I restart the computer, the primary screen doesn’t show anymore the wallpaper, as the screenshot shows.

When I click on the primary screen with the right button, I don’t see any contextual menu.

How do I fix these issues?

When I installed EOS, I choose to use the NVIDIA drivers.
This is the output of inxi -Ga.

Graphics:
  Device-1: NVIDIA GM107M [GeForce GTX 950M] vendor: ASUSTeK driver: nvidia
    v: 515.76 alternate: nouveau,nvidia_drm non-free: 515.xx+ status: current
    (as of 2022-08) arch: Maxwell code: GMxxx process: TSMC 28nm
    built: 2014-19 pcie: gen: 1 speed: 2.5 GT/s lanes: 8 link-max: gen: 3
    speed: 8 GT/s lanes: 16 ports: active: none off: HDMI-A-1,VGA-1
    empty: none bus-ID: 01:00.0 chip-ID: 10de:139a class-ID: 0300
  Display: x11 server: X.Org v: 21.1.4 compositor: kwin_x11 driver: X:
    loaded: nvidia unloaded: modesetting alternate: fbdev,nouveau,nv,vesa
    gpu: nvidia,nvidia-nvswitch display-ID: :0 screens: 1
  Screen-1: 0 s-res: 3840x1080 s-dpi: 97 s-size: 1006x301mm (39.61x11.85")
    s-diag: 1050mm (41.34")
  Monitor-1: HDMI-A-1 mapped: HDMI-0 note: disabled pos: primary,left
    model: HP 22es serial: 3CM7111BDP built: 2017 res: 1920x1080 hz: 60
    dpi: 102 gamma: 1.2 size: 476x268mm (18.74x10.55") diag: 583mm (23")
    ratio: 15:9, 16:10 modes: max: 1920x1080 min: 640x480
  Monitor-2: VGA-1 mapped: VGA-0 note: disabled pos: right model: HP 22es
    serial: 3CM7430K8F built: 2017 res: 1920x1080 hz: 60 dpi: 102 gamma: 1.2
    size: 476x267mm (18.74x10.51") diag: 546mm (21.5") ratio: 16:9 modes:
    max: 1920x1080 min: 640x480
  OpenGL: renderer: NVIDIA GeForce GTX 950M/PCIe/SSE2 v: 4.6.0 NVIDIA
    515.76 direct render: Yes

[kiamlaluno]

When I change the primary screen and change it back, all returns to normality.

In Display and Monitor > Display Configuration, on Save displays’ properties, I selected For any display arrangement.

Before these issues started, I haven’t changed the display settings nor the graphics drivers.

When I change the primary screen (without changing it back), inxi -Ga shows the following output.

Graphics:
  Device-1: NVIDIA GM107M [GeForce GTX 950M] vendor: ASUSTeK driver: nvidia
    v: 515.76 alternate: nouveau,nvidia_drm non-free: 515.xx+ status: current
    (as of 2022-08) arch: Maxwell code: GMxxx process: TSMC 28nm
    built: 2014-19 pcie: gen: 1 speed: 2.5 GT/s lanes: 8 link-max: gen: 3
    speed: 8 GT/s lanes: 16 ports: active: none off: HDMI-A-1,VGA-1
    empty: none bus-ID: 01:00.0 chip-ID: 10de:139a class-ID: 0300
  Display: x11 server: X.Org v: 21.1.4 compositor: kwin_x11 driver: X:
    loaded: nvidia unloaded: modesetting alternate: fbdev,nouveau,nv,vesa
    gpu: nvidia,nvidia-nvswitch display-ID: :0 screens: 1
  Screen-1: 0 s-res: 3840x1080 s-dpi: 91 s-size: 1070x301mm (42.13x11.85")
    s-diag: 1112mm (43.76")
  Monitor-1: HDMI-A-1 mapped: HDMI-0 note: disabled pos: primary,left
    model: HP 22es serial: 3CM7111BDP built: 2017 res: 1920x1080 hz: 60
    dpi: 102 gamma: 1.2 size: 476x268mm (18.74x10.55") diag: 583mm (23")
    ratio: 15:9, 16:10 modes: max: 1920x1080 min: 640x480
  Monitor-2: VGA-1 mapped: VGA-0 note: disabled pos: primary,right
    model: HP 22es serial: 3CM7430K8F built: 2017 res: 1920x1080 hz: 60
    dpi: 102 gamma: 1.2 size: 476x267mm (18.74x10.51") diag: 546mm (21.5")
    ratio: 16:9 modes: max: 1920x1080 min: 640x480
  OpenGL: renderer: NVIDIA GeForce GTX 950M/PCIe/SSE2 v: 4.6.0 NVIDIA
    515.76 direct render: Yes

For what I can see, between the last and the first output of inxi -Ga the difference is Screen-1 s-size which passed from 39.61x11.85" to 42.13x11.85". That doesn’t explain the issues I have, although I find this change strange.

[kiamlaluno]

I found out two posts that explain what could happen.

Desktop Settings: Wallpaper: Settings not persistent • KDE Community Forums

Right-click context menu missing from plasma-desktop • KDE Community Forums

From the first post, I learned that the settings are saved in files when Plasma closes. That explains why the settings were changed but not kept when I rebooted.
From the second post, I learned that .config/plas,a-org.kde.plasma.desktop-appletsrc contains also settings for the right-click context menu.

Since I don’t have that issue anymore. I take that configuration file got corrupted. When I changed the primary screen, I forced Plasma to write that configuration file. The first time I did that, Plasma could have “crashed” before writing the configuration file.

It also seems that having two monitor of the same brand and model confuses Plasma. I connected a different monitor and these issues are vanished (for now).