Hello everyone, I have a very odd glitch in my Kubuntu 20.04. Whenever I connect my 1920x1080 screen to my laptop (which has a hdpi screen) in "extend to" mode and I start for exemple LibreOffice Writer or another Libreoffice program in primary screen, this leads Writer's appearance to be splitted and overlapped itself. And it's happen only when Nvidia selected in prime. When Intel selected there is no problem. What is the problem and how can I fix this? Thank you.

Here some information about my system:

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inxi -SMGxx
System:    Host: workingmonster Kernel: 5.4.0-48-generic x86_64 bits: 64 compiler: gcc v: 9.3.0 Desktop: KDE Plasma 5.18.5
           tk: Qt 5.12.8 wm: kwin_x11 dm: SDDM Distro: Ubuntu 20.04.1 LTS (Focal Fossa)
Machine:   Type: Laptop System: ASUSTeK product: UX310UQK v: 1.0 serial: <superuser/root required>
           Mobo: ASUSTeK model: UX310UQK v: 1.0 serial: <superuser/root required> UEFI: American Megatrends v: UX310UQK.311
           date: 04/18/2019
Graphics:  Device-1: Intel HD Graphics 620 vendor: ASUSTeK driver: i915 v: kernel bus ID: 00:02.0 chip ID: 8086:5916
           Device-2: NVIDIA GM108M [GeForce 940MX] vendor: ASUSTeK driver: N/A bus ID: 01:00.0 chip ID: 10de:134d
           Display: x11 server: X.Org 1.20.8 driver: modesetting unloaded: fbdev,vesa compositor: kwin_x11
           resolution: 3200x1800~60Hz, 1920x1080~60Hz
           OpenGL: renderer: Mesa Intel HD Graphics 620 (KBL GT2) v: 4.6 Mesa 20.0.8 direct render: Yes

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glxinfo | grep render
direct rendering: Yes
    GLX_MESA_multithread_makecurrent, GLX_MESA_query_renderer,
    GLX_MESA_query_renderer, GLX_MESA_swap_control, GLX_OML_swap_method,
Extended renderer info (GLX_MESA_query_renderer):
OpenGL renderer string: Mesa Intel(R) HD Graphics 620 (KBL GT2)
    GL_ARB_conditional_render_inverted, GL_ARB_conservative_depth,
    GL_NV_conditional_render, GL_NV_depth_clamp,
    GL_ARB_conditional_render_inverted, GL_ARB_conservative_depth,
    GL_NV_compute_shader_derivatives, GL_NV_conditional_render,
    GL_EXT_render_snorm, GL_EXT_robustness, GL_EXT_sRGB_write_control,
    GL_NV_conditional_render, GL_NV_draw_buffers, GL_NV_fbo_color_attachments,
    GL_OES_element_index_uint, GL_OES_fbo_render_mipmap,

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spci | egrep 'VGA|3D|Display'
00:02.0 VGA compatible controller: Intel Corporation HD Graphics 620 (rev 02)
01:00.0 3D controller: NVIDIA Corporation GM108M [GeForce 940MX] (rev a2)

LibreOffice is a GTK application, what are your settings in System Settings -> Appearance -> Application Style?

İt's breeze.

Sorry, misread your first post. I bet the problem is NVIDIA, which driver do you use? The proprietary drivers in particular are problematic on Linux, blame the manufacturer for this.

I'm using the proprietary driver version 455. But It happens with 450 too.

tried the nouveau drivers?

I'm sorry for late reply. No, I didn't try, but I really hope there is a workaround with the proprietary driver. Because I don't wanna lose its benefits.

Hello!

Do you have a xorg.conf generated via nvidia-settings? If so, please post it here in codeblocks so we can see what might cause the issue.

Hello!
It seems that I don't have one. How can I generate?

Startup `nvidia-settings`, set the things up like they should be and save it. This will trigger the policy kit to pop up, as for your password and stores the xorg.conf in the system wide /etc-Folder.

Hello again,
I think I made it:

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# nvidia-xconfig: X configuration file generated by nvidia-xconfig
# nvidia-xconfig:  version 455.23.04

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

Section "Files"
EndSection

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

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

Section "Monitor"
    Identifier     "Monitor0"
    VendorName     "Unknown"
    ModelName      "Unknown"
    Option         "DPMS"
EndSection

Section "Device"
    Identifier     "Device0"
    Driver         "nvidia"
    VendorName     "NVIDIA Corporation"
EndSection

Section "Screen"
    Identifier     "Screen0"
    Device         "Device0"
    Monitor        "Monitor0"
    DefaultDepth    24
    SubSection     "Display"
        Depth       24
    EndSubSection
EndSection



There is only one Screen/Monitor mentioned. Do you have the second one connected to your nvidia card and it is not recognized? Or is it connected to the intel one? (Thats the weird thing with multiple cards…)

When I generated xorg.conf my second monitor was connected and running along the laptop's monitor. I don't think it's connected to intel. How can I see whether the stiuation is this?

I think this shot is more acquired and maybe this time the real problem shows itself: in xorg.conf file, there is a one giant monitor actually made up from adding two actual monitors each other. Indeed, I use a 1920X1080 FHD external monitor + 3200x1800 internal (laptop) monitor, but turns out that for nvidia or xserver I have just one 5685x1800 monitor.

Also I must mention, whenever I generate a xorg.config file, after reboot xorg session doesn't start. In order to get a display, I have to delete xorg.conf and reboot again (or "prime-select intel") in the bash panel.

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# nvidia-settings: X configuration file generated by nvidia-settings
# nvidia-settings:  version 440.82


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

Section "Files"
EndSection

Section "InputDevice"

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

Section "InputDevice"

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

Section "Monitor"
    Identifier     "Monitor0"
    VendorName     "Unknown"
    ModelName      "Unknown"
    Option         "DPMS"
EndSection

Section "Device"
    Identifier     "Device0"
    Driver         "nvidia"
    VendorName     "NVIDIA Corporation"
    BoardName      "GeForce 940MX"
EndSection

Section "Screen"
    Identifier     "Screen0"
    Device         "Device0"
    DefaultDepth    24
    Option         "UseDisplayDevice" "none"
    SubSection     "Display"
        Virtual     5685 1800
        Depth       24
    EndSubSection
EndSection



The screen-size is correct if you enhance your screen and not mirror the display. I was just missing the second monitor as output device, as you are using xinerama which should look like

Section "ServerLayout"
Identifier "Layout0"
Screen 0 "Screen0" 0 0
→ Screen 1 " Screen1" LeftOf "Screen0" ←
InputDevice "Keyboard0" "CoreKeyboard"
InputDevice "Mouse0" "CorePointer"
Option "Xinerama" "0"
EndSection

What does `xrandr -q` say?