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  #1  
Old 6th September 2017, 03:57 PM
lhartmann Offline
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Location: Brazil
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linuxfedorafirefox
F26, SDDM: login fails, returns to login screen

Distro: Fedora 26 x86_64, KDE spin
Hardware: i5-6500T, 8GB, 2x120GB SSDs + 3TB USB3 HDD + LVM cache, dual monitors.

Symptoms:
- Boots normally to SDDM login screen, both displays working and accepting user input.
- Logging in to my user is accepted, and apparently works, except...
- Immediatelly returns to the login screen, no error messages.

Checked:
- Free space: /home 1TB, / 28GB, /boot/* 500MB+, seems fine.
- Logging in to console (CTRL+ALT+F2): works.
- Logging in GUI as root: works.
- Logging in GUI as a brand new user: works.
- Remove all hidden stuff from my home folder: fails.
- Empty home directory: fails.
- Remove from /var/ all files whose name contains my login: fail.
- Restore full home dir, console login to CTRL+ALT+F2, startx: works perfectly.

I am out of ideas... The complete lack of any error messages is really annoying...

The issue is specific to my user, but not stored in my home folder...

What else could I check / try to fix this?
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  #2  
Old 6th September 2017, 06:55 PM
lhartmann Offline
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linuxfedorafirefox
Re: F26, SDDM: login fails, returns to login screen

Got it working by removing SDDM and installing KDM instead.

Still don't know why did that happen, anyways..
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  #3  
Old 7th September 2017, 08:51 PM
DBerlou Offline
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linuxfedorafirefox
Re: F26, SDDM: login fails, returns to login screen

I'm having the same problem. I have the KDE spin, upgraded to 26. I also have Gnome and LXDE installed.
On the SDDM log in screen, I have the option of these DEs: Gnome Classic, Gnome X windows, Gnome Wayland, LXDE or Plasma. All have this problem except for Gnome Wayland, which I can log into normally. However, I can successfully login to Plasma as root.

I checked the logs and found the following error:
Code:
13:15:29 sddm-helper: ANOM_ABEND auid=1001 uid=1001 gid=1001 ses=41 subj=system_u:system_r:xdm_t:s0-s0:c0.c1023 pid=7318 comm="sddm-helper" exe="/usr/libexec/sddm-helper" sig=11 res=1
13:15:29 sddm-helper: AVC avc:  denied  { write } for  pid=7318 comm="sddm-helper" name=".Xauthority" dev="sdb1" ino=787126 scontext=system_u:system_r:xdm_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:home_root_t:s0 tclass=file permissive=0
13:15:29 kernel: sddm-helper[7318]: segfault at 0 ip 00007ff8f93adb1e sp 00007ffe5472f790 error 4 in libc-2.25.so[7ff8f933b000+1c7000]
13:15:29 sddm-helper: Could not open stderr to "/home/mackFedora/.cache/xsession-errors"
13:15:29 sddm-helper: AVC avc:  denied  { write } for  pid=7318 comm="sddm-helper" name=".cache" dev="sdb1" ino=786449 scontext=system_u:system_r:xdm_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:home_root_t:s0 tclass=dir permissive=0

13:15:29 sddm-helper: pam_kwallet(sddm:session): pam_kwallet: open_session called without kwallet_key
13:15:29 sddm-helper: Starting: "/etc/X11/xinit/Xsession /usr/bin/startkde"
13:15:29 sddm-helper: pam_kwallet(sddm:session): pam_kwallet: pam_sm_open_session
13:15:29 sddm-helper: pam_kwallet5(sddm:session): pam_kwallet5: open_session called without kwallet5_key
I tried disabling KDE Wallet services but it had no effect.
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  #4  
Old 13th September 2017, 06:09 AM
DBerlou Offline
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linuxfedorafirefox
Re: F26, SDDM: login fails, returns to login screen

Update...
The error messages I listed in my previous post were unrelated to the login problem.
My next step will be to re-install KDE.

For now, this work around works:
At login screen, switch to another virtual terminal:
Ctrl-Shift-F2

Login on the command line then launch KDE manually:
$ startx /usr/bin/startkde
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