Black screen after login (WAYLAND)

[my4ng]

I have just upgraded to Fedora 40 (KDE Plasma 6.0, Xorg -> Wayland) and now after login the screen goes black (monitor shows disconnected message). Lightdm works without any issue, so does launching from tty3 using startplasma-wayland. I added some wayland related configs below, but it doesn't help at all.

/etc/sddm.conf.d/kde_settings.conf:

[Autologin]
Relogin=false
Session=
User=

[General]
HaltCommand=
RebootCommand=
DisplayServer=wayland
GreeterEnvironment=QT_WAYLAND_SHELL_INTEGRATION=layer-shell

[Wayland]
CompositorCommand=kwin_wayland --drm --no-lockscreen --no-global-shortcuts --locale1

[Theme]
Current=01-breeze-fedora

[Users]
MaximumUid=60000
MinimumUid=1000

journalctl -g sddm

Apr 24 20:49:45 fedora sddm[687109]: Auth: sddm-helper exited with 1
Apr 24 20:49:45 fedora audit[687321]: CRED_DISP pid=687321 uid=0 auid=1000 ses=2 subj=system_u:system_r:xdm_t:s0-s0:c0.c1023 msg='op=PAM:setcred grantors=pam_localuser,pam_unix acct="my4ng">
Apr 24 20:49:45 fedora sddm-helper[687321]: pam_kwallet5(sddm:setcred): pam_kwallet5: pam_sm_setcred
Apr 24 20:49:45 fedora sddm-helper[687321]: pam_kwallet5(sddm:session): pam_kwallet5: pam_sm_close_session
Apr 24 20:49:45 fedora audit[687321]: USER_END pid=687321 uid=0 auid=1000 ses=2 subj=system_u:system_r:xdm_t:s0-s0:c0.c1023 msg='op=PAM:session_close grantors=pam_selinux,pam_loginuid,pam_s>
Apr 24 20:49:45 fedora sddm-helper[687321]: pam_unix(sddm:session): session closed for user my4ng
Apr 24 20:49:45 fedora sddm-helper[687321]: Starting Wayland user session: "/etc/sddm/wayland-session" "/usr/libexec/plasma-dbus-run-session-if-needed /usr/bin/startplasma-wayland"
Apr 24 20:49:45 fedora audit[687321]: USER_START pid=687321 uid=0 auid=1000 ses=2 subj=system_u:system_r:xdm_t:s0-s0:c0.c1023 msg='op=PAM:session_open grantors=pam_selinux,pam_loginuid,pam_>
Apr 24 20:49:45 fedora sddm-helper[687321]: pam_kwallet5(sddm:session): pam_kwallet5: pam_sm_open_session
Apr 24 20:49:45 fedora sddm-helper[687321]: pam_unix(sddm:session): session opened for user my4ng(uid=1000) by my4ng(uid=0)
Apr 24 20:49:45 fedora audit[687121]: CRED_DISP pid=687121 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:xdm_t:s0-s0:c0.c1023 msg='op=PAM:setcred grantors=pam_permit acct="sdd>
Apr 24 20:49:45 fedora audit[687121]: USER_END pid=687121 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:xdm_t:s0-s0:c0.c1023 msg='op=PAM:session_close grantors=pam_unix,pam_sy>
Apr 24 20:49:45 fedora sddm-helper[687121]: pam_unix(sddm-greeter:session): session closed for user sddm
Apr 24 20:49:44 fedora audit[687321]: USER_ROLE_CHANGE pid=687321 uid=0 auid=1000 ses=2 subj=system_u:system_r:xdm_t:s0-s0:c0.c1023 msg='op=pam_selinux default-context=unconfined_u:unconfin>
Apr 24 20:49:44 fedora audit[687321]: CRED_ACQ pid=687321 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:xdm_t:s0-s0:c0.c1023 msg='op=PAM:setcred grantors=pam_localuser,pam_uni>
Apr 24 20:49:44 fedora sddm-helper[687321]: pam_kwallet5(sddm:setcred): pam_kwallet5: pam_sm_setcred
Apr 24 20:49:44 fedora audit[687321]: USER_ACCT pid=687321 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:xdm_t:s0-s0:c0.c1023 msg='op=PAM:accounting grantors=pam_unix,pam_loca>
Apr 24 20:49:44 fedora audit[687321]: USER_AUTH pid=687321 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:xdm_t:s0-s0:c0.c1023 msg='op=PAM:authentication grantors=pam_usertype,>
Apr 24 20:49:44 fedora sddm-helper[687321]: pam_kwallet5(sddm:auth): pam_kwallet5: pam_sm_authenticate
Apr 24 20:49:44 fedora sddm-greeter-qt6[687178]: file:///usr/share/sddm/themes/01-breeze-fedora/Main.qml:241:17 Parameter "username" is not declared. Injection of parameters into signal han>
Apr 24 20:49:35 fedora sddm-greeter-qt6[687178]: file:///usr/share/sddm/themes/01-breeze-fedora/KeyboardButton.qml:19: TypeError: Cannot read property 'longName' of undefined
Apr 24 20:49:35 fedora sddm-greeter-qt6[687178]: Loading file:///usr/share/sddm/themes/01-breeze-fedora/Main.qml...
Apr 24 20:49:34 fedora audit[687121]: USER_START pid=687121 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:xdm_t:s0-s0:c0.c1023 msg='op=PAM:session_open grantors=pam_unix,pam_s>
Apr 24 20:49:34 fedora systemd[1]: Started session-c1.scope - Session c1 of User sddm.
Apr 24 20:49:34 fedora systemd[687130]: drkonqi-coredump-cleanup.service - Cleanup lingering KCrash metadata was skipped because of an unmet condition check (ConditionPathExistsGlob=/var/li>
Apr 24 20:49:34 fedora systemd[687130]: drkonqi-sentry-postman.timer - Submitting pending crash events was skipped because of an unmet condition check (ConditionPathExistsGlob=/var/lib/sddm>
Apr 24 20:49:34 fedora systemd[687130]: drkonqi-coredump-cleanup.timer - Cleanup lingering KCrash metadata was skipped because of an unmet condition check (ConditionPathExistsGlob=/var/lib/>
Apr 24 20:49:34 fedora audit[687130]: USER_START pid=687130 uid=0 auid=974 ses=1 subj=system_u:system_r:init_t:s0 msg='op=PAM:session_open grantors=pam_selinux,pam_selinux,pam_loginuid,pam_>
Apr 24 20:49:34 fedora (systemd)[687130]: pam_unix(systemd-user:session): session opened for user sddm(uid=974) by sddm(uid=0)
Apr 24 20:49:34 fedora audit[687130]: CRED_ACQ pid=687130 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:init_t:s0 msg='op=PAM:setcred grantors=? acct="sddm" exe="/usr/lib/syst>
Apr 24 20:49:34 fedora audit[687130]: USER_ACCT pid=687130 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:init_t:s0 msg='op=PAM:accounting grantors=pam_unix acct="sddm" exe="/u>
Apr 24 20:49:34 fedora systemd-logind[686580]: New session c1 of user sddm.
Apr 24 20:49:34 fedora sddm-helper[687121]: pam_unix(sddm-greeter:session): session opened for user sddm(uid=974) by (uid=0)
Apr 24 20:49:34 fedora audit[687121]: CRED_ACQ pid=687121 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:xdm_t:s0-s0:c0.c1023 msg='op=PAM:setcred grantors=pam_permit acct="sddm>
Apr 24 20:49:34 fedora audit[687121]: USER_ACCT pid=687121 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:xdm_t:s0-s0:c0.c1023 msg='op=PAM:accounting grantors=pam_permit acct=">
Apr 24 20:49:34 fedora audit[687121]: USER_AUTH pid=687121 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:xdm_t:s0-s0:c0.c1023 msg='op=PAM:authentication grantors=pam_permit ac>
Apr 24 20:49:34 fedora audit[1]: SERVICE_START pid=1 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:init_t:s0 msg='unit=sddm comm="systemd" exe="/usr/lib/systemd/systemd" hostn>
Apr 24 20:49:34 fedora systemd[1]: Started sddm.service - Simple Desktop Display Manager.

inxi -b

System:
  Host: fedora Kernel: 6.8.7-cb1.0.fc40.x86_64 arch: x86_64 bits: 64
  Desktop: KDE Plasma v: 6.0.3 Distro: Fedora Linux 40 (KDE Plasma)
Machine:
  Type: Desktop Mobo: Micro-Star model: MAG B650 TOMAHAWK WIFI (MS-7D75)
    v: 1.0 serial: <superuser required> UEFI: American Megatrends LLC. v: 1.70
    date: 08/10/2023
CPU:
  Info: 12-core AMD Ryzen 9 7900X [MT MCP] speed (MHz): avg: 5679
    min/max: 400/5733
Graphics:
  Device-1: NVIDIA AD104 [GeForce RTX 4070 Ti] driver: nvidia v: 550.76
  Display: wayland server: X.org v: 1.20.14 with: Xwayland v: 23.2.6
    compositor: kwin_wayland driver: X: loaded: nvidia gpu: nvidia
    resolution: 3440x1440
  API: OpenGL v: 4.6.0 compat-v: 4.5 vendor: nvidia mesa v: 550.76
    renderer: NVIDIA GeForce RTX 4070 Ti/PCIe/SSE2
Network:
  Device-1: Realtek RTL8125 2.5GbE driver: r8169
  Device-2: MEDIATEK MT7922 802.11ax PCI Express Wireless Network Adapter
    driver: mt7921e
Drives:
  Local Storage: total: 2.73 TiB used: 1.82 TiB (66.8%)
Info:
  Memory: total: 64 GiB note: est. available: 62.55 GiB used: 7.01 GiB (11.2%)
  Processes: 585 Uptime: 6h 44m Shell: fish inxi: 3.3.33

[my4ng]

This seems to be the same issue as #1768 with a fix in #1779 that still needs approval. I will keep it open until someone can confirm this is indeed the same issue.

[Vogtinator]

If you use fish as your login shell, #1779 is definitely needed.