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Niluna
n00b
Joined: 05 Jun 2018
Posts: 4
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 Posted: Tue Jun 05, 2018 5:04 pm Post subject: [Solved] Cannot start Plasma (Wayland) session from SDDM |
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Dear All,
I try to start Plasma session with Wayland from SDDM, but black screen appeared for a few seconds, and return to SDDM.
~/.local/share/sddm/wayland-session.log shows following message:
| Code: | startplasmacompositor: Starting up...
No backend specified through command line argument, trying auto resolution
FATAL ERROR: backend failed to initialize, exiting now
startplasmacompositor: Shutting down...
startplasmacompositor: Done. |
Following instruction in this page, I tested "nested setup" by invoking these commands in X server session:
| Code: | export $(dbus-launch)
kwin_wayland --xwayland
kwrite --platform wayland |
and "on the TTY" test by following commands from tty:
| Code: | export $(dbus-launch)
export QT_QPA_PLATFORM=wayland
kwin_wayland --xwayland --exit-with-session=kwrite |
Both tests are ok, application is started. And invoking "dbus-run-session /usr/bin/startplasmacompositor", Wayland session is started successfully.
But from SDDM, cannot start the session with above error message.
About my gentoo box:
Graphic card is AMD's APU integrated card (Stoney Ridge, Radeon R5).
Driver is amdgpu.
Installed software versions:
x11-misc/sddm-0.17.0-r3
dev-libs/wayland-1.14.0
x11-base/xorg-server-1.19.5-r2
kde-frameworks/plasma-5.43.0
media-libs/mesa-17.3.9 (VIDEO_CARDS=radeonsi)
wayland USE flag is enabled in /etc/portage/make.conf and all package has been built with this flag.
What's wrong in my environment?
If information is insufficient, please tell me!
Thank you in advance. 
Last edited by Niluna on Thu Jun 07, 2018 4:57 am; edited 1 time in total |
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fedeliallalinea
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Joined: 08 Mar 2003
Posts: 30909
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| Posted: Tue Jun 05, 2018 5:21 pm Post subject: |
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You use OpenRC? If yes, you use elogind or consolekit?
| https://wiki.gentoo.org/wiki/KDE wrote: | | For Wayland support, a logind implementation is required. Gentoo provides elogind as an alternative to systemd. |
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Niluna
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Joined: 05 Jun 2018
Posts: 4
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| Posted: Tue Jun 05, 2018 7:54 pm Post subject: |
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Thank you for reply!
Oh, I'm using OpenRC (0.34.11) and ConsoleKit (1.2.0). Is this cause?
Although this code change in upstream, I still cannot use Wayland with ConsoleKit? |
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fedeliallalinea
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Joined: 08 Mar 2003
Posts: 30909
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| Posted: Wed Jun 06, 2018 5:53 am Post subject: |
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| Niluna wrote: | Thank you for reply!
Oh, I'm using OpenRC (0.34.11) and ConsoleKit (1.2.0). Is this cause?
Although this code change in upstream, I still cannot use Wayland with ConsoleKit? |
I've no experience with wayland but based on the wiki elogind seems mandatory.
Anyway I've plasma with elogind and work without any problem
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Niluna
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Joined: 05 Jun 2018
Posts: 4
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| Posted: Wed Jun 06, 2018 10:45 am Post subject: |
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| fedeliallalinea wrote: | I've no experience with wayland but based on the wiki elogind seems mandatory.
Anyway I've plasma with elogind and work without any problem |
If so, I cannot migrate to Wayland for now because I made some configuration changes to ConsoleKit 
Thanks for your advise, anyway! |
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Niluna
n00b
Joined: 05 Jun 2018
Posts: 4
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| Posted: Thu Jun 07, 2018 4:55 am Post subject: |
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I found that, by replacing | Code: | | Exec=dbus-run-session /usr/bin/startplasmacompositor |
with | Code: | | Exec=ck-launch-session dbus-launch --exit-with-session /usr/bin/startplasmacompositor |
in /usr/share/wayland-sessions/plasmawayland.desktop, I can start Plasma (Wayland) session.
While I encountered some strange behavoir in Wayland, I can login to Wayland session with SDDM and ConsoleKit. So, I think this topic is solved.
Thank you again for your reply giving me notice for ConsoleKit. |
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bandreabis
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Joined: 18 Feb 2005
Posts: 2490
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| Posted: Tue Oct 23, 2018 11:12 pm Post subject: |
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same problem with consolekit
changed to elogind but no luck
modified plasmawayland.desktop but none
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bandreabis
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Posts: 2490
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| Posted: Tue Nov 06, 2018 8:49 pm Post subject: |
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ck-launch-session not found
Why?
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