[SOLVED] KDE Start New Session doesn't work from lock screen

On my laptop, if I lock the KDE 4 session and then click Switch Users > Start New Session, I get a login screen and can log in as a different user. All good.
If I do the same thing on my desktop, it doesn't work. When I click Switch Users > Start New Session, it doesn't start a new session or switch VTs. Instead, I just get reprompted for the existing user's password.
Both machines are running fully updated Arch. Anyone know how I can troubleshoot this? The only difference I can think of between the laptop and desktop is that the desktop has nomodeset specified as a kernel boot parameter. (It won't boot without it.) Could this be interfering with automatic VT switching? Manual VT switching (e.g. Ctrl+Alt+F1) works fine.
Last edited by Rob_H (2014-12-27 14:28:06)

Little more detail. Checking the journal, I can see Xorg is failing to start on display :1. If I compare Xorg.0.log with Xorg.1.log, it appears that it's not finding the proprietary NVIDIA driver in the second case. Don't know why it would be any different for :1, though. See?
Xorg.0.log (good):
[ 10.219] (II) LoadModule: "glx"
[ 10.220] (II) Loading /usr/lib/xorg/modules/extensions/libglx.so
[ 10.293] (II) Module glx: vendor="NVIDIA Corporation"
[ 10.293] compiled for 4.0.2, module version = 1.0.0
[ 10.293] Module class: X.Org Server Extension
[ 10.294] (II) NVIDIA GLX Module 343.36 Mon Dec 1 15:50:02 PST 2014
[ 10.294] (II) Applying OutputClass "nvidia" to /dev/dri/card0
[ 10.294] loading driver: nvidia
[ 10.294] (==) Matched nvidia as autoconfigured driver 0
[ 10.294] (==) Matched nouveau as autoconfigured driver 1
[ 10.294] (==) Matched nv as autoconfigured driver 2
[ 10.294] (==) Matched nouveau as autoconfigured driver 3
[ 10.294] (==) Matched nv as autoconfigured driver 4
[ 10.294] (==) Matched modesetting as autoconfigured driver 5
[ 10.294] (==) Matched fbdev as autoconfigured driver 6
[ 10.294] (==) Matched vesa as autoconfigured driver 7
[ 10.294] (==) Assigned the driver to the xf86ConfigLayout
[ 10.294] (II) LoadModule: "nvidia"
[ 10.294] (II) Loading /usr/lib/xorg/modules/drivers/nvidia_drv.so
[ 10.300] (II) Module nvidia: vendor="NVIDIA Corporation"
[ 10.300] compiled for 4.0.2, module version = 1.0.0
[ 10.300] Module class: X.Org Video Driver
Xorg.1.log (bad):
[ 2153.825] (II) LoadModule: "glx"
[ 2153.825] (II) Loading /usr/lib/xorg/modules/extensions/libglx.so
[ 2153.833] (II) Module glx: vendor="NVIDIA Corporation"
[ 2153.833] compiled for 4.0.2, module version = 1.0.0
[ 2153.833] Module class: X.Org Server Extension
[ 2153.833] (II) NVIDIA GLX Module 343.36 Mon Dec 1 15:50:02 PST 2014
[ 2153.833] (==) Matched nouveau as autoconfigured driver 0
[ 2153.833] (==) Matched nv as autoconfigured driver 1
[ 2153.833] (==) Matched modesetting as autoconfigured driver 2
[ 2153.833] (==) Matched fbdev as autoconfigured driver 3
[ 2153.833] (==) Matched vesa as autoconfigured driver 4
[ 2153.833] (==) Assigned the driver to the xf86ConfigLayout
[ 2153.833] (II) LoadModule: "nouveau"
[ 2153.833] (WW) Warning, couldn't open module nouveau
Any idea what would cause it to work for :0 but fail for :1?

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