Wayland Plasma black screen on fresh installed system.

[RE0]

Hi,there.The plasma wayland(kwin) is showing me a black screen on a fresh installed system.

I manually installed the plasma by:

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#emerge -a kwin plasma-desktop

My USE var:

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USE="-screencast initramfs lvm symlink wayland zink plasma gles2 lock minizip qml"

And the plasma was started by the following command:

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$kwin_wayland

or

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$startx #xserver installed but still won't work.

I have to kill kwin after that using kill:

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#kill $(pgrep kwin)

Here is the log file that kwin-wayland generated with DEBUG flag on.
https://pastebin.mozilla.org/LW7hmsEo

I also tried to restart plasmashell but failed.

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#systemctl --user restart plasma-plasmashell.service
Job for plasma-plasmashell.service failed because a fatal signal was delivered causing the control process to dump core.
See "systemctl --user status plasma-plasmashell.service" and "journalctl --user -xeu plasma-plasmashell.service" for details.

Part of the logs by:

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#journalctl -e

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Jun 02 16:48:45 rhost systemd[1]: Created slice system-systemd\x2dcoredump.slice.
Jun 02 16:48:45 rhost systemd[1]: Started systemd-coredump@0-1403-0.service.
Jun 02 16:48:45 rhost systemd-coredump[1406]: elfutils disabled, parsing ELF objects not supported
Jun 02 16:48:45 rhost systemd-coredump[1406]: Process 1400 (plasmashell) of user 0 dumped core.
Jun 02 16:48:45 rhost systemd[1]: systemd-coredump@0-1403-0.service: Deactivated successfully.
Jun 02 16:48:45 rhost systemd[1131]: plasma-plasmashell.service: Main process exited, code=dumped, status=6/ABRT
Jun 02 16:48:45 rhost systemd[1131]: plasma-plasmashell.service: Failed with result 'core-dump'.
Jun 02 16:48:45 rhost systemd[1131]: Failed to start plasma-plasmashell.service.
Jun 02 16:48:45 rhost systemd[1131]: plasma-plasmashell.service: Scheduled restart job, restart counter is at 1.
Jun 02 16:48:45 rhost systemd[1131]: Stopped plasma-plasmashell.service.
Jun 02 16:48:45 rhost systemd[1131]: Starting plasma-plasmashell.service...
Jun 02 16:48:45 rhost plasmashell[1417]: qt.qpa.xcb: could not connect to display.
Jun 02 16:48:45 rhost plasmashell[1417]: qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "" even though it was found.
Jun 02 16:48:45 rhost plasmashell[1417]: This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.[/b]
                                         
                                         Available platform plugins are: minimal, offscreen, wayland-egl, wayland, wayland-xcomposite-egl, wayland-xcomposite-glx, xcb.

My stage3 package contains "systemd&desktop" and the same profile was selected during installation.
The profile was changed to "systemd&desktop&plasma" after I installed the plasma and found it won't work.But this did not solve the problem.
A custom kernel was used with amdgpu&ast driver built into it.

Sorry for my bad English and weak linux knowledge.

Thanks for your reading as this is too long to read.
Any help would be appreciated.

Best Regards.

[Thistled]

https://bbs.archlinux.org/viewtopic.php?id=278342

[rab0171610]

https://wiki.gentoo.org/wiki/KDE

No display manager
When using Wayland, Plasma can be launched with dbus-launch --exit-with-session startplasma-wayland.

This can be added to a user's profile file which will be executed when logging in:
FILE ~/.profile

#!/bin/sh
dbus-launch --exit-with-session startplasma-wayland

Emerge
root #emerge --ask kde-plasma/plasma-meta

Alternatively, kde-plasma/plasma-desktop provides a very basic desktop, leaving users free to install only the extra packages they require - or rather, figure out missing features on their own.
Warning
Please note that installing just kde-plasma/plasma-desktop will exclude important packages needed for KDE Plasma to function, such as kde-plasma/powerdevil (power management, suspend and hibernate options), kde-plasma/systemsettings, and many more. This package should be used with the understanding that additional packages will need to be installed to ensure a functioning environment. Do not expect support when using this package.

If you are not an advanced user, then I suggest following the wiki and later, slimming things down as you like. Also, Kwin does not need to be installed explicitly, as it will be pulled in as a dependency.