I think I suffered from the same bug, because the backtrace looks quite similar 
andI'm on Intel 915G. I was also doing nothing extraordinary. I' attach my 
xorg.0.log.old, too. I'm using Intrepid.
Thanks :)

Here are some information for people that don't want to download the complete 
log:
Error in I830WaitLpRing(), timeout for 2 seconds
pgetbl_ctl: 0x1ffc0001 getbl_err: 0x00000000
ipeir: 0x00000000 iphdr: 0x02000011
LP ring tail: 0x000001b0 head: 0x000141a4 len: 0x0001f001 start 0x00000000
eir: 0x0000 esr: 0x0000 emr: 0xffff
instdone: 0xfa41 instpm: 0x0000
memmode: 0x00000108 instps: 0x800f04c4
hwstam: 0xfffe ier: 0x0002 imr: 0x0008 iir: 0x00c0
Ring at virtual 0xa7917000 head 0x141a4 tail 0x1b0 count 12291
Ring at virtual 0xa7917000 head 0x141a4 tail 0x1b0 count 12291
Ring at virtual 0xa7917000 head 0x141a4 tail 0x1b0 count 12291
Ring at virtual 0xa7917000 head 0x141a4 tail 0x1b0 count 12291
Ring at virtual 0xa7917000 head 0x141a4 tail 0x1b0 count 12291
Ring at virtual 0xa7917000 head 0x141a4 tail 0x1b0 count 12291
        000140b4: 02005480      MI_FLUSH                                 1
        000140b8: 02000011      MI_FLUSH                                 1
        000140bc: 00000000      MI_NOOP                                  1
        000140c0: 54000006      XY_COLOR_BLT                             8
        000140c4: 03002000
        000140c8: 0100023a
        000140cc: 01000268
        000140d0: 01000000
        000140d4: 00000001
        000140d8: 000000c0
        000140dc: 02005480
        000140e0: 54000006      XY_COLOR_BLT                             8
        000140e4: 03002000
        000140e8: 01000239
        000140ec: 01000269
        000140f0: 01000000
        000140f4: 00000000
        000140f8: 000000c0
        000140fc: 02005480
        00014100: 54000004      XY_COLOR_BLT                             6
        00014104: 030000c0
        00014108: 00000000
        0001410c: 00000030
        00014110: 0200c390
        00014114: 0000ebe7
        00014118: 02000011      MI_FLUSH                                 1
        0001411c: 00000000      MI_NOOP                                  1
        00014120: 54000006      XY_COLOR_BLT                             8
        00014124: 030000c0
        00014128: 00000000
        0001412c: 0000000d
        00014130: 0200c390
        00014134: 00000025
        00014138: 000000d0
        0001413c: 02009af0
        00014140: 54000006      XY_COLOR_BLT                             8
        00014144: 030000c0
        00014148: 0000000d
        0001414c: 00000030
        00014150: 0200c390
        00014154: 00000000
        00014158: 000000d0
        0001415c: 02009af0
        00014160: 54000006      XY_COLOR_BLT                             8
        00014164: 030000c0
        00014168: 00000000
        0001416c: 0000000d
        00014170: 0200c390
        00014174: 00000025
        00014178: 000000d0
        0001417c: 02009af0
        00014180: 54000006      XY_COLOR_BLT                             8
        00014184: 030000c0
        00014188: 0000000d
        0001418c: 00000030
        00014190: 0200c390
        00014194: 00000000
        00014198: 000000d0
        0001419c: 02009af0
        000141a0: 02000011      MI_FLUSH                                 1
Ring end
space: 81900 wanted 131064
(II) intel(0): [drm] removed 1 reserved context for kernel
(II) intel(0): [drm] unmapping 8192 bytes of SAREA 0xe0086000 at 0xb7bca000
(II) intel(0): [drm] Closed DRM master.

Fatal server error:
lockup

(II) Macintosh mouse button emulation: Close
(II) UnloadModule: "evdev"
(II) HID 062a:0000: Close
(II) UnloadModule: "evdev"
(II) HID 1267:0103: Close
(II) UnloadModule: "evdev"
(II) HID 1267:0103: Close
(II) UnloadModule: "evdev"
(II) AIGLX: Suspending AIGLX clients for VT switch

Backtrace:
0: /usr/X11R6/bin/X(xf86SigHandler+0x79) [0x80c3019]
1: [0xb80fa400]
2: /usr/lib/xorg/modules/drivers//intel_drv.so [0xb7b67ba0]
3: /usr/X11R6/bin/X [0x80d6b1a]
4: /usr/lib/xorg/modules/extensions//libglx.so [0xb7c26be9]
5: /usr/X11R6/bin/X(AbortDDX+0x79) [0x80a8b09]
6: /usr/X11R6/bin/X(AbortServer+0x28) [0x813c4c8]
7: /usr/X11R6/bin/X(FatalError+0x63) [0x813cad3]
8: /usr/lib/xorg/modules/drivers//intel_drv.so(I830WaitLpRing+0x201) 
[0xb7b5c201]
9: /usr/lib/xorg/modules/drivers//intel_drv.so(I830Sync+0x1c3) [0xb7b5c613]
10: /usr/lib/xorg/modules/drivers//intel_drv.so [0xb7b848ba]
11: /usr/lib/xorg/modules//libexa.so(exaWaitSync+0x65) [0xb7a36045]
12: /usr/lib/xorg/modules//libexa.so(ExaDoPrepareAccess+0x7e) [0xb7a3723e]
13: /usr/lib/xorg/modules//libexa.so(ExaCheckPutImage+0x103) [0xb7a3ee13]
14: /usr/lib/xorg/modules//libexa.so [0xb7a38585]
15: /usr/X11R6/bin/X [0x81794bd]
16: /usr/X11R6/bin/X(ProcPutImage+0x15e) [0x808951e]
17: /usr/X11R6/bin/X(Dispatch+0x34f) [0x808c89f]
18: /usr/X11R6/bin/X(main+0x47d) [0x8071d1d]
19: /lib/tls/i686/cmov/libc.so.6(__libc_start_main+0xe5) [0xb7cfe685]
20: /usr/X11R6/bin/X [0x8071101]
Saw signal 11.  Server aborting.
(II) AIGLX: Suspending AIGLX clients for VT switch

** Attachment added: "Another log file from a crash."
   http://launchpadlibrarian.net/26470393/Xorg.0.log.old

-- 
[i915,Intrepid] X server crash (in libexa?), Intel 915GM, no compiz
https://bugs.launchpad.net/bugs/312017
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