Public bug reported:

Binary package hint: xfce4-panel

Xubuntu Gutsy
xfce4-panel 4.4.1-1ubutu3

When I use xrandr to enable and disable monitors, the xfce4-panel does
not recognize the change.

Use case environment:
When I have 2 monitors, I have the panel set to show on monitor 2 in the panel 
manager (monitor 2 is my laptop screen according to xfce). I use an external 
DVI monitor at work with a docking station and an external VGA monitor at home 
connected to the laptop. 

Use case #1:
Only laptop (LVDS) is enabled. Panel is on bottom of screen
run "xrandr --output TMDS-1 --auto --above LVDS"
panel is now on monitor 1 (the external TMDS-1) and maximized applications on 
monitor 2 (LVDS) have a gap at the bottom the height of the panel
opening the panel manager shows that it thinks there is only 1 monitor (there 
is no monitor section)
run "xfce4-panel -r" fixes the issue

Use case #2: 
laptop (LVDS) and external (TMDS-1) are enabled. Panel is on bottom of monitor 2
run "xrandr --output TMDS-1 --off"
panel is now missing
run "xfce4-panel -r" fixes the issue

running "xfce4-panel -r" is not a good workaround as many tray resident
programs do not correctly re-insert their icons in the tray after the
restart (especially KDE applications like amarok, klipper and knotes).

** Affects: xfce4-panel (Ubuntu)
     Importance: Undecided
         Status: New

-- 
panel does not pick up changes to the monitors with xrandr
https://bugs.launchpad.net/bugs/176174
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