Similar problem here with XFCE on Gentoo Linux:
The dual head setup of a desktop machine is reset to one mirrored display just by having the monitors switched off for a while. The display is usually locked but the system is running and not sleeping or somehow suspended.
xfce4-session-4.13.0 xfce4-settings-4.13.1 xfconf-4.13.4 xfdesktop-4.13.1 xfwm4-4.13.0-r1
Linux kernel 4.9.58-grsecurity
Similar problem here with XFCE on Gentoo Linux:
The dual head setup of a desktop machine is reset to one mirrored display just by having the monitors switched off for a while. The display is usually locked but the system is running and not sleeping or somehow suspended.
xfce4-session- 4.13.0 4.13.1
xfce4-settings-
xfconf-4.13.4
xfdesktop-4.13.1
xfwm4-4.13.0-r1
Linux kernel 4.9.58-grsecurity