broadwell SDDM activation after Plasma5 upgrade

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husten
Baby Hen
Posts: 2
Joined: Sun Sep 20, 2015 20:23

broadwell SDDM activation after Plasma5 upgrade

Post by husten » Sun Sep 20, 2015 20:42

I had just setup two fresh boxes with sabayon kde4 (different brands/mobo with different versions of broadwell i7-5xxxU) when the Plasma5 upgrade struck.
It would not boot into sddm, but would allow me to start sddm a root from the command line in ctr-alt-F1 screen.
I spend many hours researching .........

Here is the fix I found out myself eventually and would like to share. This problem and the solution was replicable on both boxes:

Insert a requirement to wait for Plymouth into sddm.service like this:
[Unit]
Description=Simple Desktop Display Manager
Documentation=man:sddm(1) man:sddm.conf(5)
After=systemd-user-sessions.service plymouth-quit.service

[Service]
ExecStart=/usr/bin/sddm
Restart=always
#PrivateTmp=yes
StandardOutput=syslog
BusName=org.freedesktop.DisplayManager

[Install]
Alias=display-manager.service
...and then stop and start sddm again with systemctl start sddm.service.

There is still a problem with broadwells and sddm crashing when the screen power-saves. This is apparently related to a known issue at kdeplasma. hope they fix it soon.

husten
Baby Hen
Posts: 2
Joined: Sun Sep 20, 2015 20:23

Re: broadwell SDDM activation after Plasma5 upgrade

Post by husten » Sun Sep 20, 2015 21:15

P.S. The fix just got wiped out by the weekly update (e.g. file content re-set), same problem with sddm not starting, same solution. Could "who it may concern" please fix this?

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