John Goerzen <jgoer...@complete.org> writes: > But sddm doesn't work. In fact, when it starts, it causes my monitor to > go "no signal". Oddly, though, if I can log in blindly, then once I hit > enter after putting in my password, KDE will come up and work like it > should. > > I also tried lightdm and xdm. Both of them also had "no signal" when > starting.
That kind of points to a problem with a shared config file. I only know sddm a little, its startup script /etc/sddm/Xsession ends with . /etc/X11/Xsession so it reads commands from there. Which in turn refers a whole bunch of config files. I'd guess xdm and lightdm do the same. But good luck figuring out what's wrong, especially if you have a new install where you haven't tweaked anything? You didn't restore an old home directory from backup for example? What about installing the non-free nvidia-driver? > It is using the nouveau driver. There are no errors in Xorg.0.log, > journalctl, dmesg, syslog, or the xsession log. lspci doesn't show any > other graphics adapter. xrandr on the sddm session shows it detected > the appropriate output at the appropriate resolution. Xorg.0.log looks > completely appropriate; detecting devices, setting them up, etc. Curious. I do seem to get quite a lot of messages in ~/.xsession-errors on my laptop, although they don't all look like errors.