Fedora Kinoite: SDDM / KDE won't show when logging out

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1

Hi,

I recently noticed that whenever I log out from my KDE session I’m presented with a black screen on my laptop, and the Fedora boot logo on my desktop.

The system isn’t frozen or hung, as I can switch to a tty and log into my account. However, trying to restart the SDDM display manager (sudo systemctl restart display-manager.service) won’t work.

One strange thing I noticed is that this doesn’t happen with a fresh new user, so I presume the issue must be related to KDE, right?

Looking into the system journal, I see some stuff that may indicate what the problem is, but I can’t make much out of it:

Oct 04 20:15:56 vittusaatana systemd[1]: Started sddm.service - Simple Desktop Display Manager.
Oct 04 20:15:56 vittusaatana 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" hostname=? addr=? terminal=? res=success'
Oct 04 20:15:57 vittusaatana audit[1518]: USER_AUTH pid=1518 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:xdm_t:s0-s0:c0.c1023 msg='op=PAM:authentication grantors=pam_permit acct="sddm" exe="/usr/libexec/sddm-helper" hostname=? addr=? terminal=? res=success'
Oct 04 20:15:57 vittusaatana audit[1518]: USER_ACCT pid=1518 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="sddm" exe="/usr/libexec/sddm-helper" hostname=? addr=? terminal=? res=success'
Oct 04 20:15:57 vittusaatana audit[1518]: CRED_ACQ pid=1518 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" exe="/usr/libexec/sddm-helper" hostname=? addr=? terminal=? res=success'
Oct 04 20:15:57 vittusaatana sddm-helper[1518]: pam_unix(sddm-greeter:session): session opened for user sddm(uid=976) by (uid=0)
Oct 04 20:15:57 vittusaatana systemd-logind[1224]: New session c1 of user sddm.
Oct 04 20:15:57 vittusaatana audit[1524]: USER_ACCT pid=1524 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:init_t:s0 msg='op=PAM:accounting grantors=pam_unix,pam_usertype acct="sddm" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'
Oct 04 20:15:57 vittusaatana audit[1524]: CRED_ACQ pid=1524 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:init_t:s0 msg='op=PAM:setcred grantors=? acct="sddm" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=failed'
Oct 04 20:15:57 vittusaatana systemd[1524]: pam_unix(systemd-user:session): session opened for user sddm(uid=976) by (uid=0)
Oct 04 20:15:57 vittusaatana audit[1524]: USER_START pid=1524 uid=0 auid=976 ses=1 subj=system_u:system_r:init_t:s0 msg='op=PAM:session_open grantors=pam_selinux,pam_selinux,pam_loginuid,pam_namespace,pam_keyinit,pam_limits,pam_systemd,pam_unix acct="sddm" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'
Oct 04 20:15:57 vittusaatana systemd[1]: Started session-c1.scope - Session c1 of User sddm.
Oct 04 20:15:57 vittusaatana audit[1518]: USER_START pid=1518 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_systemd acct="sddm" exe="/usr/libexec/sddm-helper" hostname=? addr=? terminal=:0 res=success'
Oct 04 20:15:57 vittusaatana sddm-helper[1518]: Starting X11 session: "" "/usr/bin/sddm-greeter --socket /tmp/sddm-:0-jumDTN --theme /usr/share/sddm/themes/01-breeze-fedora"
Oct 04 20:15:57 vittusaatana sddm-greeter[1534]: Loading file:///usr/share/sddm/themes/01-breeze-fedora/Main.qml...
Oct 04 20:15:57 vittusaatana sddm-greeter[1534]: QObject: Cannot create children for a parent that is in a different thread.
Oct 04 20:15:57 vittusaatana sddm-greeter[1534]: QObject: Cannot create children for a parent that is in a different thread.
Oct 04 20:15:57 vittusaatana sddm-greeter[1534]: QObject: Cannot create children for a parent that is in a different thread.
Oct 04 20:15:57 vittusaatana sddm-greeter[1534]: QObject: Cannot create children for a parent that is in a different thread.
Oct 04 20:15:57 vittusaatana sddm-greeter[1534]: QObject: Cannot create children for a parent that is in a different thread.
Oct 04 20:15:57 vittusaatana sddm-greeter[1534]: QObject: Cannot create children for a parent that is in a different thread.
Oct 04 20:15:57 vittusaatana sddm-greeter[1534]: QObject: Cannot create children for a parent that is in a different thread.
Oct 04 20:15:57 vittusaatana sddm-greeter[1534]: QObject::installEventFilter(): Cannot filter events for objects in a different thread.
Oct 04 20:15:57 vittusaatana sddm-greeter[1534]: Failed to find a Kirigami platform plugin
Oct 04 20:16:04 vittusaatana sddm-helper[1657]: gkr-pam: unable to locate daemon control file
Oct 04 20:16:04 vittusaatana audit[1657]: USER_AUTH pid=1657 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:xdm_t:s0-s0:c0.c1023 msg='op=PAM:authentication grantors=pam_usertype,pam_localuser,pam_unix,pam_gnome_keyring acct="cig0" exe="/usr/libexec/sddm-helper" hostname=? addr=? terminal=? res=success'
Oct 04 20:16:04 vittusaatana sddm-helper[1657]: gkr-pam: stashed password to try later in open session
Oct 04 20:16:04 vittusaatana sddm-helper[1657]: pam_kwallet5(sddm:auth): pam_kwallet5: pam_sm_authenticate
Oct 04 20:16:04 vittusaatana audit[1657]: USER_ACCT pid=1657 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_localuser acct="cig0" exe="/usr/libexec/sddm-helper" hostname=? addr=? terminal=? res=success'
Oct 04 20:16:04 vittusaatana sddm-helper[1657]: pam_kwallet5(sddm:setcred): pam_kwallet5: pam_sm_setcred
Oct 04 20:16:04 vittusaatana audit[1657]: CRED_ACQ pid=1657 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_unix,pam_gnome_keyring acct="cig0" exe="/usr/libexec/sddm-helper" hostname=? addr=? terminal=? res=success'
Oct 04 20:16:04 vittusaatana audit[1657]: USER_ROLE_CHANGE pid=1657 uid=0 auid=1000 ses=2 subj=system_u:system_r:xdm_t:s0-s0:c0.c1023 msg='pam: default-context=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 selected-context=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 exe="/usr/libexec/sddm-helper" hostname=vittusaatana addr=? terminal=/dev/tty1 res=success'
Oct 04 20:16:04 vittusaatana sddm-helper[1518]: pam_unix(sddm-greeter:session): session closed for user sddm
Oct 04 20:16:04 vittusaatana audit[1518]: USER_END pid=1518 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_systemd acct="sddm" exe="/usr/libexec/sddm-helper" hostname=? addr=? terminal=:0 res=success'
Oct 04 20:16:04 vittusaatana audit[1518]: CRED_DISP pid=1518 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" exe="/usr/libexec/sddm-helper" hostname=? addr=? terminal=:0 res=success'
Oct 04 20:16:04 vittusaatana sddm-helper[1657]: pam_unix(sddm:session): session opened for user cig0(uid=1000) by (uid=0)
Oct 04 20:16:04 vittusaatana sddm-helper[1657]: gkr-pam: gnome-keyring-daemon started properly and unlocked keyring
Oct 04 20:16:04 vittusaatana sddm-helper[1657]: pam_kwallet5(sddm:session): pam_kwallet5: pam_sm_open_session
Oct 04 20:16:04 vittusaatana sddm-helper[1680]: pam_kwallet5: final socket path: /run/user/1000/kwallet5.socket
Oct 04 20:16:04 vittusaatana audit[1657]: USER_START pid=1657 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_selinux,pam_keyinit,pam_namespace,pam_keyinit,pam_limits,pam_systemd,pam_unix,pam_gnome_keyring,pam_kwallet5,pam_umask,pam_lastlog acct="cig0" exe="/usr/libexec/sddm-helper" hostname=vittusaatana addr=? terminal=/dev/tty1 res=success'
Oct 04 20:16:04 vittusaatana sddm-helper[1657]: Starting Wayland user session: "/usr/share/sddm/scripts/wayland-session /usr/libexec/plasma-dbus-run-session-if-needed /usr/bin/startplasma-wayland"
Oct 04 20:16:04 vittusaatana audit[1682]: AVC avc:  denied  { add_name } for  pid=1682 comm="sddm-helper" name="sddm" scontext=system_u:system_r:xdm_t:s0-s0:c0.c1023 tcontext=system_u:object_r:container_file_t:s0 tclass=dir permissive=0
Oct 04 20:16:04 vittusaatana sddm-helper[1682]: Could not open stderr to "/home/cig0/.local/share/sddm/wayland-session.log"

I’m running Kinoite 36 on both my laptop and my desktop; the GPU on my laptop is an Intel chipset, and on my desktop, I’m using the closed-source, proprietary Nvidia drivers. On both systems I use Wayland, but this issue also happens with the X11 server.

2

If this is true then something in the config for your regular user seems to be the cause.

Maybe you can try either removing or renaming some of the dot files in your users home directory until you figure out which is causing the problem.

3

Hi @computersavvy, absolutely, that’s what logic dictates – and something I tried out after posting my question.

I created a service admin user with which I logged in, then proceeded to remove all traces of KDE from my main user: $HOME dot files and directories, $HOME/.local/share directories, $HOME/.config files and directories, and $HOME/.cache related stuff. It didn’t work out :expressionless:

The interesting part is that I didn´t make any manual changes to the dot files, so whatever are those breaking changes, they must have been done by using the Settings app.

Anyway, I’m considering just taking SDDM out of the equation and launching the plasma session from my $HOME/.zprofile file. I need to do a bit more research before (temporarily) retiring SDDM, to make sure Plasma will be launched in the correct way.
For anyone interested, this seems to be the right way to do so: XDG_SESSION_TYPE=wayland dbus-run-session startplasma-wayland

Cheers