First launch NEON, PLASMA is dark screen with cursor

First launch after installing kde neon on laptop (intel i7-11370H with its Iris XE Graphics GPU only), sddm normally show, but if login:
1.wayland method, dark screen with a cursor.. Type “startx” in terminal won’t change.
2.x11 method, staying in sddm. Type “startx” in terminal won’t change.

Trying to sovle but failed:
If try win+L to lock the screen, screen shows “The screen locker is broken and unlocking is not possible anymore.”

If type “systemctl --user restart plasma-plasmashell.service” in terminal, it will report that can’t open display.

If install lightdm to replace sddm:
1.wayland method, shows that session wrong and stay in lightdm.
2.x11 method, dark screen with a cursor. Type “startx” and get a log as below:


> [    91.697] 
> X.Org X Server 1.21.1.4
> X Protocol Version 11, Revision 0
> [    91.697] Current Operating System: Linux neon-bluesky 6.5.0-27-generic #28~22.04.1-Ubuntu SMP PREEMPT_DYNAMIC Fri Mar 15 10:51:06 UTC 2 x86_64
> [    91.697] Kernel command line: BOOT_IMAGE=/@/boot/vmlinuz-6.5.0-27-generic root=UUID=7919a994-4dd4-4eb1-9ca3-e778fa0e5b7f ro rootflags=subvol=@ quiet splash vt.handoff=7
> [    91.697] xorg-server 2:21.1.4-2ubuntu1.7~22.04.10 (For technical support please see http://www.ubuntu.com/support) 
> [    91.697] Current version of pixman: 0.40.0
> [    91.698] 	Before reporting problems, check http://wiki.x.org
> 	to make sure that you have the latest version.
> [    91.698] Markers: (--) probed, (**) from config file, (==) default setting,
> 	(++) from command line, (!!) notice, (II) informational,
> 	(WW) warning, (EE) error, (NI) not implemented, (??) unknown.
> [    91.698] (==) Log file: "/home/bluesky/.local/share/xorg/Xorg.1.log", Time: Sat Apr 20 20:29:04 2024
> [    91.698] (==) Using config directory: "/etc/X11/xorg.conf.d"
> [    91.698] (==) Using system config directory "/usr/share/X11/xorg.conf.d"
> [    91.698] (==) No Layout section.  Using the first Screen section.
> [    91.698] (==) No screen section available. Using defaults.
> [    91.698] (**) |-->Screen "Default Screen Section" (0)
> [    91.698] (**) |   |-->Monitor "<default monitor>"
> [    91.698] (==) No monitor specified for screen "Default Screen Section".
> 	Using a default monitor configuration.
> [    91.698] (==) Automatically adding devices
> [    91.698] (==) Automatically enabling devices
> [    91.698] (==) Automatically adding GPU devices
> [    91.698] (==) Automatically binding GPU devices
> [    91.698] (==) Max clients allowed: 256, resource mask: 0x1fffff
> [    91.698] (WW) The directory "/usr/share/fonts/X11/cyrillic" does not exist.
> [    91.698] 	Entry deleted from font path.
> [    91.698] (WW) The directory "/usr/share/fonts/X11/100dpi/" does not exist.
> [    91.698] 	Entry deleted from font path.
> [    91.698] (WW) The directory "/usr/share/fonts/X11/75dpi/" does not exist.
> [    91.698] 	Entry deleted from font path.
> [    91.698] (WW) The directory "/usr/share/fonts/X11/100dpi" does not exist.
> [    91.698] 	Entry deleted from font path.
> [    91.698] (WW) The directory "/usr/share/fonts/X11/75dpi" does not exist.
> [    91.698] 	Entry deleted from font path.
> [    91.698] (==) FontPath set to:
> 	/usr/share/fonts/X11/misc,
> 	/usr/share/fonts/X11/Type1,
> 	built-ins
> [    91.698] (==) ModulePath set to "/usr/lib/xorg/modules"
> [    91.698] (II) The server relies on udev to provide the list of input devices.
> 	If no devices become available, reconfigure udev or disable AutoAddDevices.
> [    91.698] (II) Loader magic: 0x63dcb6429020
> [    91.698] (II) Module ABI versions:
> [    91.698] 	X.Org ANSI C Emulation: 0.4
> [    91.698] 	X.Org Video Driver: 25.2
> [    91.698] 	X.Org XInput driver : 24.4
> [    91.698] 	X.Org Server Extension : 10.0
> [    91.698] (++) using VT number 2
> 
> [    91.699] (II) systemd-logind: took control of session /org/freedesktop/login1/session/_32
> [    91.699] (II) xfree86: Adding drm device (/dev/dri/card0)
> [    91.699] (II) Platform probe for /sys/devices/pci0000:00/0000:00:02.0/drm/card0
> [    91.700] (II) systemd-logind: got fd for /dev/dri/card0 226:0 fd 13 paused 0
> [    91.701] (--) PCI:*(0@0:2:0) 8086:9a49:152d:1346 rev 1, Mem @ 0x6000000000/16777216, 0x4000000000/268435456, I/O @ 0x00003000/64, BIOS @ 0x????????/131072
> [    91.701] (II) LoadModule: "glx"
> [    91.701] (II) Loading /usr/lib/xorg/modules/extensions/libglx.so
> [    91.701] (II) Module glx: vendor="X.Org Foundation"
> [    91.701] 	compiled for 1.21.1.4, module version = 1.0.0
> [    91.701] 	ABI class: X.Org Server Extension, version 10.0
> [    91.701] (==) Matched modesetting as autoconfigured driver 0
> [    91.701] (==) Matched fbdev as autoconfigured driver 1
> [    91.701] (==) Matched vesa as autoconfigured driver 2
> [    91.701] (==) Assigned the driver to the xf86ConfigLayout
> [    91.701] (II) LoadModule: "modesetting"
> [    91.701] (II) Loading /usr/lib/xorg/modules/drivers/modesetting_drv.so
> [    91.701] (II) Module modesetting: vendor="X.Org Foundation"
> [    91.701] 	compiled for 1.21.1.4, module version = 1.21.1
> [    91.701] 	Module class: X.Org Video Driver
> [    91.701] 	ABI class: X.Org Video Driver, version 25.2
> [    91.701] (II) LoadModule: "fbdev"
> [    91.701] (II) Loading /usr/lib/xorg/modules/drivers/fbdev_drv.so
> [    91.701] (II) Module fbdev: vendor="X.Org Foundation"
> [    91.701] 	compiled for 1.21.1.3, module version = 0.5.0
> [    91.701] 	Module class: X.Org Video Driver
> [    91.701] 	ABI class: X.Org Video Driver, version 25.2
> [    91.701] (II) LoadModule: "vesa"
> [    91.701] (II) Loading /usr/lib/xorg/modules/drivers/vesa_drv.so
> [    91.701] (II) Module vesa: vendor="X.Org Foundation"
> [    91.701] 	compiled for 1.21.1.3, module version = 2.5.0
> [    91.701] 	Module class: X.Org Video Driver
> [    91.701] 	ABI class: X.Org Video Driver, version 25.2
> [    91.701] (II) modesetting: Driver for Modesetting Kernel Drivers: kms
> [    91.701] (II) FBDEV: driver for framebuffer: fbdev
> [    91.701] (II) VESA: driver for VESA chipsets: vesa
> [    91.701] xf86EnableIO: failed to enable I/O ports 0000-03ff (Operation not permitted)
> [    91.701] (II) modeset(0): using drv /dev/dri/card0
> [    91.701] (WW) Falling back to old probe method for fbdev
> [    91.701] (II) Loading sub module "fbdevhw"
> [    91.701] (II) LoadModule: "fbdevhw"
> [    91.701] (II) Loading /usr/lib/xorg/modules/libfbdevhw.so
> [    91.702] (II) Module fbdevhw: vendor="X.Org Foundation"
> [    91.702] 	compiled for 1.21.1.4, module version = 0.0.2
> [    91.702] 	ABI class: X.Org Video Driver, version 25.2
> [    91.702] (EE) open /dev/fb0: Permission denied
> [    91.702] (WW) VGA arbiter: cannot open kernel arbiter, no multi-card support
> [    91.702] (II) modeset(0): Creating default Display subsection in Screen section
> 	"Default Screen Section" for depth/fbbpp 24/32
> [    91.702] (==) modeset(0): Depth 24, (==) framebuffer bpp 32
> [    91.702] (==) modeset(0): RGB weight 888
> [    91.702] (==) modeset(0): Default visual is TrueColor
> [    91.702] (II) Loading sub module "glamoregl"
> [    91.702] (II) LoadModule: "glamoregl"
> [    91.702] (II) Loading /usr/lib/xorg/modules/libglamoregl.so
> [    91.703] (II) Module glamoregl: vendor="X.Org Foundation"
> [    91.703] 	compiled for 1.21.1.4, module version = 1.0.1
> [    91.703] 	ABI class: X.Org ANSI C Emulation, version 0.4
> [    91.722] (II) modeset(0): glamor X acceleration enabled on Mesa Intel(R) Xe Graphics (TGL GT2)
> [    91.722] (II) modeset(0): glamor initialized
> [    91.722] (==) modeset(0): VariableRefresh: disabled
> [    91.722] (==) modeset(0): AsyncFlipSecondaries: disabled
> [    91.725] (II) modeset(0): Output eDP-1 has no monitor section
> [    91.725] (II) modeset(0): Output HDMI-1 has no monitor section
> [    91.725] (II) modeset(0): Output DP-1 has no monitor section
> [    91.725] (II) modeset(0): Output DP-2 has no monitor section
> [    91.725] (II) modeset(0): Output DP-3 has no monitor section
> [    91.728] (II) modeset(0): EDID for output eDP-1
> [    91.728] (II) modeset(0): Manufacturer: CSO  Model: 140d  Serial#: 1245065520
> [    91.728] (II) modeset(0): Year: 2021  Week: 0
> [    91.728] (II) modeset(0): EDID Version: 1.4
> [    91.728] (II) modeset(0): Digital Display Input
> [    91.728] (II) modeset(0): 10 bits per channel
> [    91.728] (II) modeset(0): Digital interface is DisplayPort
> [    91.728] (II) modeset(0): Max Image Size [cm]: horiz.: 30  vert.: 20
> [    91.728] (II) modeset(0): Gamma: 2.20
> [    91.728] (II) modeset(0): No DPMS capabilities specified
> [    91.728] (II) modeset(0): Supported color encodings: RGB 4:4:4 
> [    91.728] (II) modeset(0): First detailed timing is preferred mode
> [    91.728] (II) modeset(0): Preferred mode is native pixel format and refresh rate
> [    91.728] (II) modeset(0): Display is continuous-frequency
> [    91.728] (II) modeset(0): redX: 0.640 redY: 0.330   greenX: 0.300 greenY: 0.600
> [    91.728] (II) modeset(0): blueX: 0.150 blueY: 0.060   whiteX: 0.313 whiteY: 0.329
> [    91.728] (II) modeset(0): Manufacturer's mask: 0
> [    91.728] (II) modeset(0): Supported detailed timing:
> [    91.728] (II) modeset(0): clock: 418.0 MHz   Image Size:  300 x 200 mm
> [    91.728] (II) modeset(0): h_active: 2520  h_sync: 2568  h_sync_end 2600 h_blank_end 2700 h_border: 0
> [    91.728] (II) modeset(0): v_active: 1680  v_sync: 1704  v_sync_end 1710 v_blanking: 1720 v_border: 0
> [    91.728] (II) modeset(0): Ranges: V min: 48 V max: 90 Hz, H min: 160 H max: 160 kHz, PixClock max 435 MHz
> [    91.728] (II) modeset(0):  CSOTT3
> [    91.728] (II) modeset(0):  MNE208ZA1-3
> [    91.728] (II) modeset(0): Number of EDID sections to follow: 1
> [    91.728] (II) modeset(0): EDID (in hex):
> [    91.728] (II) modeset(0): 	00ffffffffffff000e6f0d143031364a
> [    91.728] (II) modeset(0): 	001f0104b51e147803ee95a3544c9926
...
> [    91.728] (II) modeset(0): 	0000000000000000000000000000bc90
> [    91.729] (II) modeset(0): Printing probed modes for output eDP-1
> [    91.729] (II) modeset(0): Modeline "2520x1680"x90.0  417.96  2520 2568 2600 2700  1680 1704 1710 1720 -hsync -vsync (154.8 kHz eP)
> [    91.729] (II) modeset(0): Modeline "2520x1680"x60.0  417.96  2520 2568 2600 2700  1680 1704 1710 2580 -hsync -vsync (154.8 kHz e)
...
> [    91.729] (II) modeset(0): Modeline "320x180"x90.0   13.46  320 344 360 400  180 181 184 187 doublescan +hsync -vsync (33.7 kHz d)
> [    91.729] (II) modeset(0): Modeline "320x175"x90.0   16.62  320 336 368 416  175 191 192 222 doublescan +hsync -vsync (40.0 kHz d)
> [    91.729] (II) modeset(0): EDID for output HDMI-1
> [    91.729] (II) modeset(0): EDID for output DP-1
> [    91.729] (II) modeset(0): EDID for output DP-2
> [    91.729] (II) modeset(0): EDID for output DP-3
> [    91.729] (II) modeset(0): Output eDP-1 connected
> [    91.729] (II) modeset(0): Output HDMI-1 disconnected
> [    91.729] (II) modeset(0): Output DP-1 disconnected
> [    91.729] (II) modeset(0): Output DP-2 disconnected
> [    91.729] (II) modeset(0): Output DP-3 disconnected
> [    91.729] (II) modeset(0): Using exact sizes for initial modes
> [    91.729] (II) modeset(0): Output eDP-1 using initial mode 2520x1680 +0+0
> [    91.729] (==) modeset(0): Using gamma correction (1.0, 1.0, 1.0)
> [    91.729] (==) modeset(0): DPI set to (96, 96)
> [    91.729] (II) Loading sub module "fb"
> [    91.729] (II) LoadModule: "fb"
> [    91.729] (II) Module "fb" already built-in
> [    91.729] (II) UnloadModule: "fbdev"
> [    91.729] (II) Unloading fbdev
> [    91.729] (II) UnloadSubModule: "fbdevhw"
> [    91.729] (II) Unloading fbdevhw
> [    91.729] (II) UnloadModule: "vesa"
> [    91.729] (II) Unloading vesa
> [    91.740] (==) modeset(0): Backing store enabled
> [    91.740] (==) modeset(0): Silken mouse enabled
> [    91.795] (II) modeset(0): Initializing kms color map for depth 24, 8 bpc.
> [    91.795] (==) modeset(0): DPMS enabled
> [    91.795] (II) modeset(0): [DRI2] Setup complete
> [    91.795] (II) modeset(0): [DRI2]   DRI driver: iris
> [    91.795] (II) modeset(0): [DRI2]   VDPAU driver: va_gl
> [    91.795] (II) Initializing extension Generic Event Extension
> [    91.796] (II) Initializing extension SHAPE
> [    91.796] (II) Initializing extension MIT-SHM
> [    91.796] (II) Initializing extension XInputExtension
> [    91.796] (II) Initializing extension XTEST
> [    91.796] (II) Initializing extension BIG-REQUESTS
> [    91.797] (II) Initializing extension SYNC
> [    91.797] (II) Initializing extension XKEYBOARD
> [    91.797] (II) Initializing extension XC-MISC
> [    91.797] (II) Initializing extension SECURITY
> [    91.797] (II) Initializing extension XFIXES
> [    91.797] (II) Initializing extension RENDER
> [    91.798] (II) Initializing extension RANDR
> [    91.798] (II) Initializing extension COMPOSITE
> [    91.798] (II) Initializing extension DAMAGE
> [    91.798] (II) Initializing extension MIT-SCREEN-SAVER
> [    91.798] (II) Initializing extension DOUBLE-BUFFER
> [    91.799] (II) Initializing extension RECORD
> [    91.799] (II) Initializing extension DPMS
> [    91.799] (II) Initializing extension Present
> [    91.799] (II) Initializing extension DRI3
> [    91.799] (II) Initializing extension X-Resource
> [    91.799] (II) Initializing extension XVideo
> [    91.799] (II) Initializing extension XVideo-MotionCompensation
> [    91.799] (II) Initializing extension SELinux
> [    91.799] (II) SELinux: Disabled on system
> [    91.799] (II) Initializing extension GLX
> [    91.810] (II) AIGLX: Loaded and initialized iris
> [    91.810] (II) GLX: Initialized DRI2 GL provider for screen 0
> [    91.810] (II) Initializing extension XFree86-VidModeExtension
> [    91.810] (II) Initializing extension XFree86-DGA
> [    91.810] (II) Initializing extension XFree86-DRI
> [    91.810] (II) Initializing extension DRI2
> [    91.811] (II) modeset(0): Damage tracking initialized
> [    91.811] (II) modeset(0): Setting screen physical size to 666 x 444
> [    91.834] (II) config/udev: Adding input device Power Button (/dev/input/event2)
> [    91.834] (**) Power Button: Applying InputClass "libinput keyboard catchall"
> [    91.834] (**) Power Button: Applying InputClass "system-keyboard"
> [    91.834] (II) LoadModule: "libinput"
> [    91.834] (II) Loading /usr/lib/xorg/modules/input/libinput_drv.so
> [    91.835] (II) Module libinput: vendor="X.Org Foundation"
> [    91.835] 	compiled for 1.20.14, module version = 1.2.1
> [    91.835] 	Module class: X.Org XInput Driver
> [    91.835] 	ABI class: X.Org XInput driver, version 24.1
> [    91.835] (II) Using input driver 'libinput' for 'Power Button'
> [    91.836] (II) systemd-logind: got fd for /dev/input/event2 13:66 fd 27 paused 0
> [    91.836] (**) Power Button: always reports core events
> [    91.836] (**) Option "Device" "/dev/input/event2"
> [    91.838] (II) event2  - Power Button: is tagged by udev as: Keyboard
> [    91.838] (II) event2  - Power Button: device is a keyboard
> [    91.838] (II) event2  - Power Button: device removed
> [    91.838] (**) Option "config_info" "udev:/sys/devices/LNXSYSTM:00/LNXPWRBN:00/input/input2/event2"
> [    91.838] (II) XINPUT: Adding extended input device "Power Button" (type: KEYBOARD, id 6)
> [    91.838] (**) Option "xkb_model" "pc105"
> [    91.838] (**) Option "xkb_layout" "cn"
> [    91.838] (WW) Option "xkb_variant" requires a string value
> [    91.848] (II) event2  - Power Button: is tagged by udev as: Keyboard
> [    91.848] (II) event2  - Power Button: device is a keyboard
> [    91.848] (II) config/udev: Adding input device Video Bus (/dev/input/event8)
> [    91.848] (**) Video Bus: Applying InputClass "libinput keyboard catchall"
> [    91.848] (**) Video Bus: Applying InputClass "system-keyboard"
> [    91.848] (II) Using input driver 'libinput' for 'Video Bus'
> [    91.849] (II) systemd-logind: got fd for /dev/input/event8 13:72 fd 30 paused 0
> [    91.849] (**) Video Bus: always reports core events
> [    91.849] (**) Option "Device" "/dev/input/event8"
> [    91.850] (II) event8  - Video Bus: is tagged by udev as: Keyboard
> [    91.850] (II) event8  - Video Bus: device is a keyboard
> [    91.850] (II) event8  - Video Bus: device removed
> [    91.850] (**) Option "config_info" "udev:/sys/devices/LNXSYSTM:00/LNXSYBUS:00/PNP0A08:00/LNXVIDEO:00/input/input9/event8"
> [    91.850] (II) XINPUT: Adding extended input device "Video Bus" (type: KEYBOARD, id 7)
> [    91.850] (**) Option "xkb_model" "pc105"
> [    91.850] (**) Option "xkb_layout" "cn"
> [    91.850] (WW) Option "xkb_variant" requires a string value
> [    91.850] (II) event8  - Video Bus: is tagged by udev as: Keyboard
> [    91.850] (II) event8  - Video Bus: device is a keyboard
> [    91.851] (II) config/udev: Adding input device Power Button (/dev/input/event0)
> [    91.851] (**) Power Button: Applying InputClass "libinput keyboard catchall"
> [    91.851] (**) Power Button: Applying InputClass "system-keyboard"
> [    91.851] (II) Using input driver 'libinput' for 'Power Button'
> [    91.851] (II) systemd-logind: got fd for /dev/input/event0 13:64 fd 31 paused 0
> [    91.851] (**) Power Button: always reports core events
> [    91.851] (**) Option "Device" "/dev/input/event0"
> [    91.852] (II) event0  - Power Button: is tagged by udev as: Keyboard
> [    91.852] (II) event0  - Power Button: device is a keyboard
> [    91.852] (II) event0  - Power Button: device removed
> [    91.852] (**) Option "config_info" "udev:/sys/devices/LNXSYSTM:00/LNXSYBUS:00/PNP0C0C:00/input/input0/event0"
> [    91.852] (II) XINPUT: Adding extended input device "Power Button" (type: KEYBOARD, id 8)
> [    91.852] (**) Option "xkb_model" "pc105"
> [    91.852] (**) Option "xkb_layout" "cn"
> [    91.852] (WW) Option "xkb_variant" requires a string value
> [    91.852] (II) event0  - Power Button: is tagged by udev as: Keyboard
> [    91.852] (II) event0  - Power Button: device is a keyboard
> [    91.853] (II) config/udev: Adding input device Lid Switch (/dev/input/event1)
> [    91.853] (II) No input driver specified, ignoring this device.
> [    91.853] (II) This device may have been added with another device file.
> [    91.853] (II) config/udev: Adding input device GXTP7863:00 27C6:01E0 Mouse (/dev/input/event5)
> [    91.853] (**) GXTP7863:00 27C6:01E0 Mouse: Applying InputClass "libinput pointer catchall"
> [    91.853] (II) Using input driver 'libinput' for 'GXTP7863:00 27C6:01E0 Mouse'
> [    91.853] (II) systemd-logind: got fd for /dev/input/event5 13:69 fd 32 paused 0
> [    91.853] (**) GXTP7863:00 27C6:01E0 Mouse: always reports core events
> [    91.853] (**) Option "Device" "/dev/input/event5"
> [    91.854] (II) event5  - GXTP7863:00 27C6:01E0 Mouse: is tagged by udev as: Mouse Pointingstick
> [    91.854] (II) event5  - GXTP7863:00 27C6:01E0 Mouse: device is a pointer
> [    91.854] (II) event5  - GXTP7863:00 27C6:01E0 Mouse: device removed
> [    91.854] (**) Option "config_info" "udev:/sys/devices/pci0000:00/0000:00:15.0/i2c_designware.0/i2c-1/i2c-GXTP7863:00/0018:27C6:01E0.0001/input/input11/event5"
> [    91.854] (II) XINPUT: Adding extended input device "GXTP7863:00 27C6:01E0 Mouse" (type: MOUSE, id 9)
> [    91.854] (**) Option "AccelerationScheme" "none"
> [    91.854] (**) GXTP7863:00 27C6:01E0 Mouse: (accel) selected scheme none/0
> [    91.855] (**) GXTP7863:00 27C6:01E0 Mouse: (accel) acceleration factor: 2.000
> [    91.855] (**) GXTP7863:00 27C6:01E0 Mouse: (accel) acceleration threshold: 4
> [    91.855] (II) event5  - GXTP7863:00 27C6:01E0 Mouse: is tagged by udev as: Mouse Pointingstick
> [    91.855] (II) event5  - GXTP7863:00 27C6:01E0 Mouse: device is a pointer
> [    91.856] (II) config/udev: Adding input device GXTP7863:00 27C6:01E0 Mouse (/dev/input/mouse0)
> [    91.856] (II) No input driver specified, ignoring this device.
> [    91.856] (II) This device may have been added with another device file.
> [    91.856] (II) config/udev: Adding input device GXTP7863:00 27C6:01E0 Touchpad (/dev/input/event9)
> [    91.856] (**) GXTP7863:00 27C6:01E0 Touchpad: Applying InputClass "libinput touchpad catchall"
> [    91.856] (II) Using input driver 'libinput' for 'GXTP7863:00 27C6:01E0 Touchpad'
> [    91.857] (II) systemd-logind: got fd for /dev/input/event9 13:73 fd 33 paused 0
> [    91.857] (**) GXTP7863:00 27C6:01E0 Touchpad: always reports core events
> [    91.857] (**) Option "Device" "/dev/input/event9"
> [    91.858] (II) event9  - GXTP7863:00 27C6:01E0 Touchpad: is tagged by udev as: Touchpad
> [    91.859] (II) event9  - GXTP7863:00 27C6:01E0 Touchpad: device is a touchpad
> [    91.859] (II) event9  - GXTP7863:00 27C6:01E0 Touchpad: device removed
> [    91.859] (**) Option "config_info" "udev:/sys/devices/pci0000:00/0000:00:15.0/i2c_designware.0/i2c-1/i2c-GXTP7863:00/0018:27C6:01E0.0001/input/input12/event9"
> [    91.859] (II) XINPUT: Adding extended input device "GXTP7863:00 27C6:01E0 Touchpad" (type: TOUCHPAD, id 10)
> [    91.859] (**) Option "AccelerationScheme" "none"
> [    91.860] (**) GXTP7863:00 27C6:01E0 Touchpad: (accel) selected scheme none/0
> [    91.860] (**) GXTP7863:00 27C6:01E0 Touchpad: (accel) acceleration factor: 2.000
> [    91.860] (**) GXTP7863:00 27C6:01E0 Touchpad: (accel) acceleration threshold: 4
> [    91.860] (II) event9  - GXTP7863:00 27C6:01E0 Touchpad: is tagged by udev as: Touchpad
> [    91.861] (II) event9  - GXTP7863:00 27C6:01E0 Touchpad: device is a touchpad
> [    91.861] (II) config/udev: Adding input device GXTP7863:00 27C6:01E0 Touchpad (/dev/input/mouse1)
> [    91.861] (II) No input driver specified, ignoring this device.
> [    91.861] (II) This device may have been added with another device file.
> [    91.861] (II) config/udev: Adding input device GXTP738X:00 27C6:0114 (/dev/input/event6)
> [    91.861] (**) GXTP738X:00 27C6:0114: Applying InputClass "libinput touchscreen catchall"
> [    91.861] (II) Using input driver 'libinput' for 'GXTP738X:00 27C6:0114'
> [    91.862] (II) systemd-logind: got fd for /dev/input/event6 13:70 fd 34 paused 0
> [    91.862] (**) GXTP738X:00 27C6:0114: always reports core events
> [    91.862] (**) Option "Device" "/dev/input/event6"
> [    91.862] (II) event6  - GXTP738X:00 27C6:0114: is tagged by udev as: Touchscreen
> [    91.862] (II) event6  - GXTP738X:00 27C6:0114: device is a touch device
> [    91.863] (II) event6  - GXTP738X:00 27C6:0114: device removed
> [    91.863] (**) Option "config_info" "udev:/sys/devices/pci0000:00/0000:00:15.1/i2c_designware.1/i2c-2/i2c-GXTP738X:00/0018:27C6:0114.0002/input/input14/event6"
> [    91.863] (II) XINPUT: Adding extended input device "GXTP738X:00 27C6:0114" (type: TOUCHSCREEN, id 11)
> [    91.863] (**) Option "AccelerationScheme" "none"
> [    91.863] (**) GXTP738X:00 27C6:0114: (accel) selected scheme none/0
> [    91.863] (**) GXTP738X:00 27C6:0114: (accel) acceleration factor: 2.000
> [    91.863] (**) GXTP738X:00 27C6:0114: (accel) acceleration threshold: 4
> [    91.863] (II) event6  - GXTP738X:00 27C6:0114: is tagged by udev as: Touchscreen
> [    91.863] (II) event6  - GXTP738X:00 27C6:0114: device is a touch device
> [    91.864] (II) config/udev: Adding input device GXTP738X:00 27C6:0114 (/dev/input/mouse2)
> [    91.864] (II) No input driver specified, ignoring this device.
> [    91.864] (II) This device may have been added with another device file.
> [    91.864] (II) config/udev: Adding input device GXTP738X:00 27C6:0114 UNKNOWN (/dev/input/event7)
> [    91.864] (II) No input driver specified, ignoring this device.
> [    91.864] (II) This device may have been added with another device file.
> [    91.864] (II) config/udev: Adding input device sof-hda-dsp Mic (/dev/input/event10)
> [    91.864] (II) No input driver specified, ignoring this device.
> [    91.864] (II) This device may have been added with another device file.
> [    91.865] (II) config/udev: Adding input device sof-hda-dsp Headphone (/dev/input/event11)
> [    91.865] (II) No input driver specified, ignoring this device.
> [    91.865] (II) This device may have been added with another device file.
> [    91.865] (II) config/udev: Adding input device sof-hda-dsp HDMI/DP,pcm=3 (/dev/input/event12)
> [    91.865] (II) No input driver specified, ignoring this device.
> [    91.865] (II) This device may have been added with another device file.
> [    91.866] (II) config/udev: Adding input device sof-hda-dsp HDMI/DP,pcm=4 (/dev/input/event13)
> [    91.866] (II) No input driver specified, ignoring this device.
> [    91.866] (II) This device may have been added with another device file.
> [    91.866] (II) config/udev: Adding input device sof-hda-dsp HDMI/DP,pcm=5 (/dev/input/event14)
> [    91.866] (II) No input driver specified, ignoring this device.
> [    91.866] (II) This device may have been added with another device file.
> [    91.866] (II) config/udev: Adding input device Huawei WMI hotkeys (/dev/input/event4)
> [    91.866] (**) Huawei WMI hotkeys: Applying InputClass "libinput keyboard catchall"
> [    91.866] (**) Huawei WMI hotkeys: Applying InputClass "system-keyboard"
> [    91.866] (II) Using input driver 'libinput' for 'Huawei WMI hotkeys'
> [    91.867] (II) systemd-logind: got fd for /dev/input/event4 13:68 fd 35 paused 0
> [    91.867] (**) Huawei WMI hotkeys: always reports core events
> [    91.867] (**) Option "Device" "/dev/input/event4"
> [    91.867] (II) event4  - Huawei WMI hotkeys: is tagged by udev as: Keyboard
> [    91.867] (II) event4  - Huawei WMI hotkeys: device is a keyboard
> [    91.867] (II) event4  - Huawei WMI hotkeys: device removed
> [    91.867] (**) Option "config_info" "udev:/sys/devices/platform/huawei-wmi/input/input10/event4"
> [    91.867] (II) XINPUT: Adding extended input device "Huawei WMI hotkeys" (type: KEYBOARD, id 12)
> [    91.867] (**) Option "xkb_model" "pc105"
> [    91.867] (**) Option "xkb_layout" "cn"
> [    91.867] (WW) Option "xkb_variant" requires a string value
> [    91.868] (II) event4  - Huawei WMI hotkeys: is tagged by udev as: Keyboard
> [    91.868] (II) event4  - Huawei WMI hotkeys: device is a keyboard
> [    91.868] (II) config/udev: Adding input device AT Translated Set 2 keyboard (/dev/input/event3)
> [    91.868] (**) AT Translated Set 2 keyboard: Applying InputClass "libinput keyboard catchall"
> [    91.868] (**) AT Translated Set 2 keyboard: Applying InputClass "system-keyboard"
> [    91.868] (II) Using input driver 'libinput' for 'AT Translated Set 2 keyboard'
> [    91.868] (II) systemd-logind: got fd for /dev/input/event3 13:67 fd 36 paused 0
> [    91.868] (**) AT Translated Set 2 keyboard: always reports core events
> [    91.868] (**) Option "Device" "/dev/input/event3"
> [    91.869] (II) event3  - AT Translated Set 2 keyboard: is tagged by udev as: Keyboard
> [    91.869] (II) event3  - AT Translated Set 2 keyboard: device is a keyboard
> [    91.869] (II) event3  - AT Translated Set 2 keyboard: device removed
> [    91.869] (**) Option "config_info" "udev:/sys/devices/platform/i8042/serio0/input/input3/event3"
> [    91.869] (II) XINPUT: Adding extended input device "AT Translated Set 2 keyboard" (type: KEYBOARD, id 13)
> [    91.869] (**) Option "xkb_model" "pc105"
> [    91.869] (**) Option "xkb_layout" "cn"
> [    91.869] (WW) Option "xkb_variant" requires a string value
> [    91.870] (II) event3  - AT Translated Set 2 keyboard: is tagged by udev as: Keyboard
> [    91.870] (II) event3  - AT Translated Set 2 keyboard: device is a keyboard
> [   122.193] (**) Option "fd" "27"
> [   122.193] (II) event2  - Power Button: device removed
> [   122.193] (**) Option "fd" "30"
> [   122.193] (II) event8  - Video Bus: device removed
> [   122.193] (**) Option "fd" "31"
> [   122.193] (II) event0  - Power Button: device removed
> [   122.193] (**) Option "fd" "32"
> [   122.193] (II) event5  - GXTP7863:00 27C6:01E0 Mouse: device removed
> [   122.193] (**) Option "fd" "33"
> [   122.193] (II) event9  - GXTP7863:00 27C6:01E0 Touchpad: device removed
> [   122.193] (**) Option "fd" "34"
> [   122.193] (II) event6  - GXTP738X:00 27C6:0114: device removed
> [   122.193] (**) Option "fd" "35"
> [   122.193] (II) event4  - Huawei WMI hotkeys: device removed
> [   122.193] (**) Option "fd" "36"
> [   122.193] (II) event3  - AT Translated Set 2 keyboard: device removed
> [   122.200] (II) UnloadModule: "libinput"
> [   122.200] (II) systemd-logind: releasing fd for 13:67
> [   122.220] (II) UnloadModule: "libinput"
...

2 similar topic[Plasma 6 update, desktop won’t load], [Black screen with cursor after updating KDE Neon to Plasma 6] [Plasma 6: Lock screen renders black (troubleshooting help)]was refered and try this command and so on:

sudo apt autoremove
sudo pkcon install libdecor-0-0
sudo pkcon install libsdl2-2.0-0
sudo pkcon install plasma-desktop
sudo pkcon install plasma-desktop-data
sudo pkcon install libdecor-0-0 libsdl2-2.0-0 plasma-desktop plasma-des
ktop-data --allow-reinstall

But it seems nothing for help, just change one: logining in X11 method will show a cursor with dark screen, and get some wrong showing in terminal:
1.type “sudo sddm” and login plasma, terminal will show:


Some wrong reports as below:

...
(WW) HELPER: [PAM] Asked to close the session but it wasn't previously open
...

(WW) HELPER: Signal received: SIGTERM
...
(WW) DAEMON: Error from greeter session: "process crashed"
(WW) DAEMON: Auth: sddm-helper (--socker /tmp/sddm-auth- ...
(WW) DAEMON: Error from greeter session: "process crashed"
(WW) DAEMON: Auth: sddm-helper exited with 9

2.type “startx” and get a window which shows “startkde: could not start plasma session” on upleft.
3.Icewm can be normally login through sddm. But there are no kde’s software can be launched.

Installing neon is normal to display.

Sincere thanks to those who offered help!