...
CailWriteATIRegister(6884,101)
CailReadATIRegister(68ec) = 100
CailWriteATIRegister(68ec,100)
Blank CRTC 1 success
CailReadATIRegister(6880) = 100
Disable CRTC 1 success

Backtrace:
0: /usr/bin/X(xf86SigHandler+0x82) [0x80c693e]
1: [0xb7f06420]
2: /usr/lib/xorg/modules/extensions//libGLcore.so(XMesaResizeBuffers+0x2b) [0xaf9021cd]
3: /usr/lib/xorg/modules/extensions//libGLcore.so [0xaf900fb9]
4: /usr/lib/xorg/modules/extensions//libglx.so [0xb7b7b78c]
5: /usr/bin/X(ResizeChildrenWinSize+0x161) [0x807cd00]
6: /usr/bin/X(miSlideAndSizeWindow+0x1a5) [0x813879a]
7: /usr/bin/X(ConfigureWindow+0xa3d) [0x807c7bc]
8: /usr/bin/X(ProcConfigureWindow+0x8e) [0x808dead]
9: /usr/bin/X [0x815066e]
10: /usr/bin/X(Dispatch+0x1ed) [0x808e6f3]
11: /usr/bin/X(main+0x4a8) [0x8076ef5]
12: /lib/libc.so.6(__libc_start_main+0xe6) [0xb7c66006]
13: /usr/bin/X(FontFileCompleteXLFD+0x1fd) [0x8076241]

Fatal server error:
Caught signal 11.  Server aborting

AGD: output dpms 3
AGD: tmds dpms
CailReadATIRegister(7904) = 1f
CailWriteATIRegister(7904,0)
Output 66 disable success
...