I'm actually using xmonad with xfsettingsd to deal with some configs.

I can't use keybinding C-M-p in the GUI version of emacsclient.
I tried removing all customization files and typing "C-h c C-M-p", but emacs responsed as if only "C-h c" was typed and still waiting for the next key. (but "C-h c C-M-n" worked fine)

However, both emacs itself and emacsclient without window system works fine.

And If I bring up emacsclient before xfsettingsd, then everything will be fine.
But as long as xfsettingsd gets brought up first, C-M-p won't work.

Runing "XFSETTINGSD_DEBUG=1 xfsettingsd --replace --no-daemon" doesn't
reveal any related messages when C-M-p is hit.

Here are the related software versions:

xfce-base/xfce4-settings-4.11.3
app-editors/emacs-24.3
app-emacs/emacs-daemon-0.21

Reproducible: Always

Steps to Reproduce:
1. launch xfsettingsd
1. use emacsclient ("emacsclient -c -a "") to open any elisp or scheme source code
2. try C-M-p and C-M-n to navigate around

Actual Results:  
emacs only responses to C-M-n but not C-M-p

Expected Results:  
C-M-p should work.