Created attachment 7226 xfce4-display-settings showing Mirror on the preview but no Mirror checkbox checked The default external display behaviour after pluging new device was "blank on the external display" until one decided to use "Extend to right" (preferred) or "Mirror". After upgrading to Fedora 26 (XFCE 4.12) the default display settings changed. After external display plugs in, it: - starts the half-assed Mirror mode - sometimes moves the main panel to the external display (which is not what the mirror mode does too) so it seems more like an error than intention - minimal settings (the xfce4-display-settings -m) indicates the Mirror mode - full settings (xfce4-display-settings) shows not Mirror mode checkox checked but shows Mirror mode on screen preview When I manually select "Extend to right" in minimal mode it just starts working in extend mode. When I play with other modes in minimal settings mode it mainly gets mad selecting wrong resolution for primary display. The right behaviour is to show the settings but do not mirror the display, at least not that strange way it does now.
Created attachment 7227 minimal settings - the mirror is selected
Created attachment 7228 correct mirror settings
Created attachment 7229 correct extend to right settings
looking at the xfce4-settings/dialogs/display-settings/main.c it seems that the mirror mode is selected by Fedora itself, not by the xfce. Will investigate further.
I'm seeing this with: Xubuntu 17.10 Dell XPS 13 9360 DE laptop Intel HD 620 GPU LG 27UD58P-B External monitor connected via Thunderbolt 3 to Display Port cable Whenever my system suspends or monitor happens to sleep, stand-by, whatever, my settings are not saved, mirror mode is enabled despite the fact that it was disabled previously, the checkbox claims it is disabled, and I am forced to reconfigure everything once again. I must check and then uncheck the mirror mode checkbox to get it to display both monitors again and then reconfigure my settings. xfce4-settings: 4.12.1-1ubuntu1 Linux kernel: 4.13.0-11-generic #12-Ubuntu SMP Tue Sep 12 16:03:57 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux
+1 DISTRIB_ID=ManjaroLinux DISTRIB_RELEASE=17.0.5 DISTRIB_CODENAME=Gellivara DISTRIB_DESCRIPTION="Manjaro Linux" xfce4-panel 4.12.1 (Xfce 4.12) and checkbox primary monitor no found.
Bug 13531 and bug 13590 are duplicates of this
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