[hana@localhost Desktop]$ su
Password:
[root@localhost Desktop]# beryl
************************************************** ************
* Beryl system compatiblity check *
************************************************** ************

Detected xserver : AIGLX

Checking Display :0.0 ...

Checking for XComposite extension : passed (v0.3)
Checking for XDamage extension : passed
Checking for RandR extension : passed
Checking for XSync extension : passed

Checking Screen 0 ...

Xlib: extension "GLX" missing on display ":0.0".
Root visual is not a GL visual
beryl: SmcOpenConnection failed: Authentication Rejected, reason : None of the authentication protocols specified are supported and host-based authentication failed
Xlib: extension "GLX" missing on display ":0.0".
Xlib: extension "GLX" missing on display ":0.0".
Xlib: extension "GLX" missing on display ":0.0".
beryl: glXCreateContext failed
beryl: Failed to manage screen: 0
beryl: No manageable screens found on display :0.0