$ beryl-manager
bdgraue@kristallei:~$ beryl-manager doesn't autostart window-manager/decorator
any more. Please consult: man beryl-manager

XGL Absent, checking for NVIDIA
Nvidia Present
Relaunching beryl with __GL_YIELD="NOTHING"
XGL Absent, checking for NVIDIA
Nvidia Present
beryl: Another window manager is already running on screen: 0
beryl: No manageable screens found on display :0.0

-----------------------------------------------------------

~# beryl-manager --force-window-manager
root@kristallei:~# XGL Absent, checking for NVIDIA
Nvidia Present
Relaunching beryl with __GL_YIELD="NOTHING"
XGL Absent, checking for NVIDIA
Nvidia Present
beryl: Another window manager is already running on screen: 0
beryl: No manageable screens found on display :0.0