# grep EE /var/log/Xorg.0.log.old 
	(WW) warning, (EE) error, (NI) not implemented, (??) unknown.
[  1340.169] Initializing built-in extension MIT-SCREEN-SAVER
[  1340.172] (EE) Failed to load module "nv" (module does not exist, 0)
[  1340.180] (EE) NOUVEAU(G0): Error creating GPU channel: -19
[  1340.180] (EE) NOUVEAU(G0): Error initialising acceleration.  Falling back to NoAccel
[  1553.224] (EE) 
[  1553.224] (EE) Backtrace:
[  1553.227] (EE) 0: /usr/bin/Xorg (OsLookupColor+0x129) [0x473759]
[  1553.227] (EE) 1: /lib64/libpthread.so.0 (__restore_rt+0x0) [0x3b1fc0f74f]
[  1553.227] (EE) 2: /usr/bin/Xorg (DRICloseScreen+0x1154) [0x573bc4]
[  1553.227] (EE) 3: /usr/bin/Xorg (DRICloseScreen+0x118d) [0x573c9d]
[  1553.227] (EE) 4: /usr/bin/Xorg (DRI2Connect+0x57) [0x574ca7]
[  1553.227] (EE) 5: /usr/bin/Xorg (DRI2SendAuthReply+0x2fc) [0x575afc]
[  1553.227] (EE) 6: /usr/bin/Xorg (SendErrorToClient+0x427) [0x43a3a7]
[  1553.228] (EE) 7: /usr/bin/Xorg (_init+0x3b0a) [0x42c00a]
[  1553.228] (EE) 8: /lib64/libc.so.6 (__libc_start_main+0xf5) [0x3b1f421d65]
[  1553.228] (EE) 9: /usr/bin/Xorg (_start+0x29) [0x428c35]
[  1553.228] (EE) 10: ? (?+0x29) [0x29]
[  1553.228] (EE) 
[  1553.228] (EE) Segmentation fault at address 0x28
[  1553.229] (EE) 
[  1553.229] (EE) Caught signal 11 (Segmentation fault). Server aborting
[  1553.229] (EE) 
[  1553.229] (EE) 
[  1553.229] (EE) Please also check the log file at "/var/log/Xorg.0.log" for additional information.
[  1553.229] (EE) 
[  1553.235] (EE) Server terminated with error (1). Closing log file.