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67d34a1
(Get the code!)
So, FYI, the NVidia driver also suffers from this: turn off a monitor and Plasma crashes; turn off both monitors and X crashes.
There is a workaround with the nvidia proprietary driver: specify your connected displays in xorg.conf. Mine looks like this:
Section "Screen"
Identifier "Screen0"
DefaultDepth 24
Option "MetaModes" "DFP-4: 3840x2160 +0+0, DFP-6: 3840x2160 +3840+0"
Option "ConnectedMonitor" "DFP-4, DFP-6"
EndSection
This says that DFP-4 and DFP-6 are connected, and have the specified initial resolutions and positions. Now, when I turn a monitor off, absolutely nothing happens: X thinks the monitor is still on, which means Plasma doesn't notice the change and doesn't crash. w00t.
The other problem I had was that even with this X wouldn't activate the second display (both are Dell P2715q) when it started because it had switched to power saving mode, so X came up in single-head mode on the same display as the virtual console. The following command line activates the second display:
xrandr --output DP-4 --pos 3840x0 --mode 3840x2160
Note that the output name doesn't match the ConnectedMonitor name from the NVidia driver. Yeah, there are two names for everything. Awesome, right?
Anyway, it would be nice to get a fix for this, but that depends on there being a way to distinguish between "I unplugged the monitor", "I shut the monitor off", and "the monitor went into power saving mode". If there isn't, then my vote is in favor of doing something intelligent in the usual case, which is that it's way more likely my monitor went into power saving mode than that I disconnected it.