Backtrace:
0: /usr/bin/X(xf86SigHandler+0x84) [0x80c4724]
1: [0xb7f2b420]
2: /usr/lib/xorg/modules/extensions/libglx.so(__glXVendorPrivate+0x1b3) [0xb7beac63]

3: /usr/lib/xorg/modules/extensions/libglx.so [0xb7beefaa]
4: /usr/bin/X(Dispatch+0x19b) [0x808722b]
5: /usr/bin/X(main+0x488) [0x806ec38]
6: /lib/libc.so.6(__libc_start_main+0xd8) [0xb7d61808]
7: /usr/bin/X(FontFileCompleteXLFD+0xa5) [0x806df61]

Fatal server error:
Caught signal 11.  Server aborting

(**) RADEON(0): RADEONLeaveVT
(**) RADEON(0): RADEONRestore
(**) RADEON(0): RADEONRestoreMode()
(**) RADEON(0): RADEONRestoreMode(0x8209d60)
(**) RADEON(0): RADEONRestoreMemMapRegisters() :
(**) RADEON(0):   MC_FB_LOCATION   : 0x3fff3800
(**) RADEON(0):   MC_AGP_LOCATION  : 0x003f0000
(**) RADEON(0):   Map Changed ! Applying ...
(**) RADEON(0):   Map applied, resetting engine ...
(**) RADEON(0): Updating display base addresses...

(**) RADEON(0): Memory map updated.
(**) RADEON(0): Programming CRTC1, offset: 0x00000000
(**) RADEON(0): Wrote: 0x00180006 0x00020077 0x00000000 (0x0000a400)
(**) RADEON(0): Wrote: rd=6, fd=119, pd=2
(**) RADEON(0): Ok, leaving now...

beryl-manager: Fatal IO error 104 (Connection reset by peer) on X server :1.0.The application 'xfce-mcs-manager' lost its connection to the display :1.0;
most likely the X server was shut down or you killed/destroyed
the application.
xfce4-panel: Fatal IO error 104 (Connection reset by peer) on X server :1.0.
xinit:  connection to X server lost.

waiting for X server to shut down The application 'xfdesktop' lost its connection to the display :1.0;
most likely the X server was shut down or you killed/destroyed
the application.