Dear Maintainer,
I have just upgraded the system in question from Debian Wheezy to
Debian Jessie. In doing so I did allow systemd, including its init
system, to be installed.
On Wheezy the Global Hotkeys plugin would detect my media keys
(Logitech G110, showing them as XF86AudioPrev and the like) no matter
which of my dual monitors I had focus in. Now under Jessie it will
only detect them if the mouse pointer is in the same monitor that
Audacious displays on.
I use the Nvidia binary drivers, via the Debian nvidia-drivers package
for the X display, and it's configured as two separate displays (no
Xinerama). I'm using fvwm as my window manager, started from
~/.Xsession, which will have been triggered by gdm3.