Hi
after I turned on my laptop today I faced with a black screen with cursor.
it's running Intel Core i7-6600U and Intel HD Graphics 520
I did some research and here's the result:
after opening shell by alt+ctrl+f12
runng

cat /etc/group |grep sddm

i get

video:x:44:sddm
sddm:x:125:

which dosen't include my username 'javad', it should be somthing like

video:x:44:root.javad.sddm
sddm:x:125:javad

but it is not.
I have successfully booted to my desktop using

startx

but i'm not able to run system applications like 'System Settings' or 'Discover' so there shouldn't be any problem with 'X'
after I opened Dolphin it was automatically on '/usr/share/X11/xorg.conf.d/'
10-amdgpu.conf

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Section "OutputClass"
   Identifier "AMDgpu"
   MatchDriver "amdgpu"
   Driver "amdgpu"
EndSection

10-quirks.conf

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# Collection of quirks and blacklist/whitelists for specific devices.


# Accelerometer device, posts data through ABS_X/ABS_Y, making X unusable
# http://bugs.freedesktop.org/show_bug.cgi?id=22442
Section "InputClass"
        Identifier "ThinkPad HDAPS accelerometer blacklist"
        MatchProduct "ThinkPad HDAPS accelerometer data"
        Option "Ignore" "on"
EndSection

# https://bugzilla.redhat.com/show_bug.cgi?id=523914
# Mouse does not move in PV Xen guest
# Explicitly tell evdev to not ignore the absolute axes.
Section "InputClass"
        Identifier "Xen Virtual Pointer axis blacklist"
        MatchProduct "Xen Virtual Pointer"
        Option "IgnoreAbsoluteAxes" "off"
        Option "IgnoreRelativeAxes" "off"
EndSection

# https://bugs.freedesktop.org/show_bug.cgi?id=55867
# Bug 55867 - Doesn't know how to tag XI_TRACKBALL
Section "InputClass"
        Identifier "Tag trackballs as XI_TRACKBALL"
        MatchProduct "trackball"
        MatchDriver "evdev"
        Option "TypeName" "TRACKBALL"
EndSection

# https://bugs.freedesktop.org/show_bug.cgi?id=62831
# Bug 62831 - Mionix Naos 5000 mouse detected incorrectly
Section "InputClass"
        Identifier "Tag Mionix Naos 5000 mouse XI_MOUSE"
        MatchProduct "La-VIEW Technology Naos 5000 Mouse"
        MatchDriver "evdev"
        Option "TypeName" "MOUSE"
EndSection


10-radeon.conf

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Section "OutputClass"
   Identifier "Radeon"
   MatchDriver "radeon"
   Driver "radeon"
EndSection

20-virtual.conf

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Section "Device"
 Identifier "intelgpu0"
Driver "intel"
Option "VirtualHeads" "1"
EndSection


40-libinput.conf

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# Match on all types of devices but joysticks
#
# If you want to configure your devices, do not copy this file.
# Instead, use a config snippet that contains something like this:
#
# Section "InputClass"
#   Identifier "something or other"
#   MatchDriver "libinput"
#
#   MatchIsTouchpad "on"
#   ... other Match directives ...
#   Option "someoption" "value"
# EndSection
#
# This applies the option any libinput device also matched by the other
# directives. See the xorg.conf(5) man page for more info on
# matching devices.

Section "InputClass"
        Identifier "libinput pointer catchall"
        MatchIsPointer "on"
        MatchDevicePath "/dev/input/event*"
        Driver "libinput"
EndSection

Section "InputClass"
        Identifier "libinput keyboard catchall"
        MatchIsKeyboard "on"
        MatchDevicePath "/dev/input/event*"
        Driver "libinput"
EndSection

Section "InputClass"
        Identifier "libinput touchpad catchall"
        MatchIsTouchpad "on"
        MatchDevicePath "/dev/input/event*"
        Driver "libinput"
EndSection

Section "InputClass"
        Identifier "libinput touchscreen catchall"
        MatchIsTouchscreen "on"
        MatchDevicePath "/dev/input/event*"
        Driver "libinput"
EndSection

Section "InputClass"
        Identifier "libinput tablet catchall"
        MatchIsTablet "on"
        MatchDevicePath "/dev/input/event*"
        Driver "libinput"
EndSection


70-waacom.conf

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# Some of the below input classes appear 3x times, once for each of
# "tablet", "touchscreen", and "touchpad" to ensure that the Wacom
# driver is not accidentally bound to other types of hardware that
# Wacom has made which are not handled by the wacom driver (e.g the
# Wacom Bluetooth Keyboard)
#
# https://sourceforge.net/p/linuxwacom/bugs/294/

Section "InputClass"
        Identifier "Wacom USB tablet class"
        MatchUSBID "056a:*"
        MatchDevicePath "/dev/input/event*"
        MatchIsTablet "true"
        Driver "wacom"
EndSection

Section "InputClass"
        Identifier "Wacom USB touchscreen class"
        MatchUSBID "056a:*"
        MatchDevicePath "/dev/input/event*"
        MatchIsTouchscreen "true"
        Driver "wacom"
EndSection

Section "InputClass"
        Identifier "Wacom USB touchpad class"
        MatchUSBID "056a:*"
        MatchDevicePath "/dev/input/event*"
        MatchIsTouchpad "true"
        Driver "wacom"
EndSection

Section "InputClass"
   Identifier "Wacom tablet class"
   MatchProduct "Wacom|WACOM|PTK-540WL|ISD-V4"
   MatchDevicePath "/dev/input/event*"
   MatchIsTablet "true"
   Driver "wacom"
EndSection

Section "InputClass"
   Identifier "Wacom touchscreen class"
   MatchProduct "Wacom|WACOM|PTK-540WL|ISD-V4"
   MatchDevicePath "/dev/input/event*"
   MatchIsTouchscreen "true"
   Driver "wacom"
EndSection

Section "InputClass"
   Identifier "Wacom touchpad class"
   MatchProduct "Wacom|WACOM|PTK-540WL|ISD-V4"
   MatchDevicePath "/dev/input/event*"
   MatchIsTouchpad "true"
   Driver "wacom"
EndSection

# Serial Wacom devices should always be one of tablet, touchscreen, or
# touchpad so we can safely get away with just one match section in
# these cases
Section "InputClass"
        Identifier "Wacom PnP device class"
        MatchPnPID "WACf*|WCOM*|WACM*|FUJ02e5|FUJ02e7|FUJ02e9"
        MatchDevicePath "/dev/input/event*"
        Driver "wacom"
EndSection

Section "InputClass"
   Identifier "Wacom serial class"
   MatchProduct "Serial Wacom Tablet"
   Driver "wacom"
EndSection

Section "InputClass"
        Identifier "Wacom serial class identifiers"
        MatchProduct "WACf|FUJ02e5|FUJ02e7|FUJ02e9"
        Driver "wacom"
EndSection

# Hanwang tablets
Section "InputClass"
   Identifier "Hanwang class"
   MatchProduct "Hanwang"
   MatchDevicePath "/dev/input/event*"
   Driver "wacom"
EndSection

# Waltop tablets
Section "InputClass"
   Identifier "Waltop class"
   MatchProduct "WALTOP"
   MatchIsTablet "on"
   MatchDevicePath "/dev/input/event*"
   Driver "wacom"
EndSection

# N-Trig Duosense Electromagnetic Digitizer
Section "InputClass"
   Identifier "Wacom N-Trig class"
   MatchProduct "HID 1b96:0001|N-Trig Pen|N-Trig DuoSense"
   MatchDevicePath "/dev/input/event*"
   Driver "wacom"
   Option "Button2" "3"
EndSection

# Dell Canvas 27 (touch part is an Advanced Silicon, pen part a Wacom)
Section "InputClass"
        Identifier "Dell Canvas 27 Touch"
        MatchUSBID "2575:0204"
        MatchDevicePath "/dev/input/event*"
        MatchIsTouchscreen "true"
        Driver "wacom"
EndSection

# Surface Go
Section "InputClass"
        Identifier "SurfaceGo Touch"
        MatchProduct "ELAN9038:00 04F3:261A"
        MatchDevicePath "/dev/input/event*"
        Driver "wacom"
EndSection

# Nuvision Solo 10 Draw (Supports Surface Pens)
Section "InputClass"
        Identifier "Nuvision Solo 10 Draw"
        MatchProduct "04F3200A:00 04F3:22F7"
        MatchDevicePath "/dev/input/event*"
        Driver "wacom"
EndSection




any idea how should I fix that?