Hello, I am running Lubuntu 14.10 with a 3 monitor setup as per the attached image.
eDP1 is the built-in display of my laptop (Dell Precision M4800), DP-0 is connected to the HDMI output and DP-4 - to a DisplayPort output. I want Firefox and Thunderbird on eDP1. I can move them there but occasionally they would move to DP-4. For TB that often (but not always) seems to be triggered by arrival of a new mail. If I open the program menu (i.e. File, Edit, etc) on FF/TB while they are on eDP1 the menu itself appears on DP-4. If I open the system menu (the icon in the upper left corner of the window with Move, Resize, Close, etc) that menu also appears on DP-4. Leafpat is somewhat better - the program menu works as expected but the system menu also goes to the wrong monitor. If I use autocomplete in FF the list of autocompleted entries appears on DP-4 If I use wmctrl to move windows to eDP1 (command like "wmctrl -i -r 0x02600003 -e 0,100,880,300,300") it wouldn't move the window wntirely on eDP1 - either part or the entire window goes on DP-4. I can move it using the mouse though. All problems are related to eDP1. Everything works fine with DP-0 and DP-4. The greeter (the graphical login program) used to have eDP1 and DP-4 mirrored and DP-0 to the right of them. That looked fairly unusual with a rotated DP-4. I fixed that by creating file /usr/share/lightdm/lightdm.conf.d/98-set-randr-3-monitors.conf with this content: === [SeatDefaults] greeter-setup-script=/etc/X11/3monitorsOK.sh === The content of /etc/X11/3monitorsOK.sh is: === #!/bin/sh xrandr --output VIRTUAL1 --off --output DP1 --off --output eDP1 --mode 1920x1080 --pos 0x840 --rotate normal --output HDMI1 --off --output VGA1 --off --output DP-5 --off --output DP-4 --mode 1920x1080 --pos 1920x0 --rotate left --output DP-3 --off --output DP-2 --off --output DP-1 --off --output DP-0 --mode 1920x1080 --pos 3000x576 --rotate normal === The panel appears in the lower right hand corner of DP-4 when I log on. If I kill it (killall lxpanel) and start it again (lxpanel&) it appears where I want it - on the left of eDP1. There are probably a few more issues but the above should be enough to give you a decent impression of the problem. Please help me fix these issues. I would be happy to recompile stuff if needed. Regards Vesselin
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