SDDM is being problematic again

English Install/Boot/Login
1

This is still happening on the latest 20190201 version. When I get to the logon screen after booting, sometimes the cursor isn’t blinking, and I can’t type my password. I have to drop to console, “init 3 ; init 5 ; exit”, and try again 2-3 times. In dmesg, I see for each failed SDDM session:

QSGRenderThread[1882]: segfault at 7 ip 00007f3f46d356f6 sp 00007f3f0372b240 error 4 in libc-2.27.so[7f3f46cd1000+14a000]
Code: 84 42 ff ff ff 0f 1f 80 00 00 00 00 4a 8d 0c e0 48 8b 51 40 48 85 d2 0f 84 2a ff ff ff 48 81 fb ff 03 00 00 0f 87 aa 01 00 00 <48> 8b 32 48 89 71 40 42 80 2c 20 01 48 83 c4 08 48 89 d0 5b 5d 41

I have a “stock clocks” GTX 1060 6GB + latest nVidia driver 418.30 + THREE screens (3x4K), in case that’s important here. Because my google-fu suggests this is a multi-threaded race condition.

2

I have always used LightDm and no problem, indeed the login is much faster

3

If your display positions are configured only in your WM or DE, maybe configuring them globally (/etc/X11/), so that config is employed before the greeter appears, would avoid the segfault.