Forwarding this bug reported against Ubuntu:
https://bugs.launchpad.net/xserver-xorg-video-intel/+bug/220019

"This bug is occurring in Hardy, xserver-xorg version 1:7.3+10ubuntu10, regardless of compiz being activated or not, with Totem as well as with MPlayer. I have an Intel 915GM card using the i810 server.

Randomly, opening a video makes X crash before any image is displayed. X restarts and I'm back to GDM. No specific video will trigger this, and later I'll be able to play the same video file without trouble. I could notice the crash is almost always occurring when Kdenlive (video editing app) has been running for a while; but else the bug can happen at anytime, in an unpredictable way.

Attached are the different log files, and here's the most relevant part of Xorg.0.log.old (that of the crash):
Backtrace:
0: /usr/bin/X(xf86SigHandler+0x7e) [0x80c780e]
1: [0xb7f9f420]
2: /usr/bin/X [0x80da805]
3: /usr/lib/xorg/modules/extensions//libextmod.so(XvdiPutImage+0x178) [0xb7c08608]
4: /usr/lib/xorg/modules/extensions//libextmod.so [0xb7c0b476]
5: /usr/bin/X [0x81506de]
6: /usr/bin/X(Dispatch+0x2cf) [0x808d8df]
7: /usr/bin/X(main+0x48b) [0x807471b]
8: /lib/tls/i686/cmov/libc.so.6(__libc_start_main+0xe0) [0xb7d31450]
9: /usr/bin/X(FontFileCompleteXLFD+0x201) [0x8073a91]

Fatal server error:
Caught signal 11. Server aborting
"

http://launchpadlibrarian.net/13590425/Xorg.0.log.old
http://launchpadlibrarian.net/13590420/Xorg.0.log

lspci info:
00:02.0 VGA compatible controller [0300]: Intel Corporation Mobile 915GM/GMS/910GML Express Graphics Controller [8086:2592] (rev 03) (prog-if 00 [VGA controller])
	Subsystem: Toshiba America Info Systems Unknown device [1179:ff00]
	Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B-
	Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR-
	Latency: 0
	Interrupt: pin A routed to IRQ 17
	Region 0: Memory at b0080000 (32-bit, non-prefetchable) [size=512K]
	Region 1: I/O ports at 1800 [size=8]
	Region 2: Memory at c0000000 (32-bit, prefetchable) [size=256M]
	Region 3: Memory at b0000000 (32-bit, non-prefetchable) [size=256K]
	Capabilities: <access denied>


Here's a more detailed backtrace:

http://launchpadlibrarian.net/14258144/trace with gdb.log
Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0xb7caba30 (LWP 6788)]
0xb7dbd9bc in memcpy () from /lib/tls/i686/cmov/libc.so.6
(gdb) bt full
#0  0xb7dbd9bc in memcpy () from /lib/tls/i686/cmov/libc.so.6
No symbol table info available.
#1  0xb7b841d8 in I830PutImage (pScrn=0x821b718, src_x=<value optimized out>, 
    src_y=<value optimized out>, drw_x=5, drw_y=119, src_w=720, src_h=576, 
    drw_w=796, drw_h=447, id=808596553, 
    buf=0xa2910000 "SerZFT\\UY[]\\YWX[ZPONIR__hhhtwmlimkhfhhb[UURROKOQPU\\]UMLPUZZSORTSTTSQPQTV`c^VZfjfhcdeca]VSX]XWZ[bfidciebkhvvpttnmsprmmomuurjgiffmztyz{zw}z~\201\200~\177\200\200\206\203\202\201~}}z\200\202\177s}\204w\177\205\202~}\177\201~yy\201\207\203\212}y\206\204s\201\210mboywhhh\204�\232\210\216\213\223\215tkss"..., width=720, height=576, sync=0, clipBoxes=0xbf8c52e4, data=0x822f134, 
    pDraw=0x8d798f8) at ../../src/i830_video.c:1379
	pI830 = (I830Ptr) 0x821d168
	pScreen = (ScreenPtr) 0x8229918
	pPixmap = <value optimized out>
	x1 = 0
	x2 = 47185920
	y1 = 0
	y2 = 37748736
	srcPitch = 720
	srcPitch2 = 360
	dstPitch = 384
	destId = 808596553
	top = 0
---Type <return> to continue, or q <return> to quit---
	left = 0
	npixels = 720
	nlines = 576
	size = 663552
	dstBox = {x1 = 5, y1 = 119, x2 = 801, y2 = 566}
	pitchAlignMask = <value optimized out>
	alloc_size = <value optimized out>
	extraLinear = <value optimized out>
	crtc = <value optimized out>
#2  0x080da805 in xf86XVPutImage (client=0x8a13738, pDraw=0x8d798f8, 
    pPort=0x825a1f8, pGC=0x8ae7c20, src_x=<value optimized out>, 
    src_y=<value optimized out>, src_w=<value optimized out>, 
    src_h=<value optimized out>, drw_x=0, drw_y=0, 
    drw_w=<value optimized out>, drw_h=<value optimized out>, 
    format=0x8259fc0, 
    data=0xa2910000 "SerZFT\\UY[]\\YWX[ZPONIR__hhhtwmlimkhfhhb[UURROKOQPU\\]UMLPUZZSORTSTTSQPQTV`c^VZfjfhcdeca]VSX]XWZ[bfidciebkhvvpttnmsprmmomuurjgiffmztyz{zw}z~\201\200~\177\200\200\206\203\202\201~}}z\200\202\177s}\204w\177\205\202~}\177\201~yy\201\207\203\212}y\206\204s\201\210mboywhhh\204�\232\210\216\213\223\215tkss"..., sync=0, width=<value optimized out>, height=<value optimized out>)
    at ../../../../hw/xfree86/common/xf86xv.c:1777
	portPriv = <value optimized out>
	WinRegion = {extents = {x1 = 5, y1 = 119, x2 = 801, y2 = 566}, 
---Type <return> to continue, or q <return> to quit---
  data = 0x0}
	ClipRegion = {extents = {x1 = 5, y1 = 119, x2 = 801, y2 = 566}, 
  data = 0x0}
	ret = 0
#3  0xb7c37608 in XvdiPutImage (client=0x8a13738, pDraw=0x8d798f8, 
    pPort=0x825a1f8, pGC=0x8ae7c20, src_x=<value optimized out>, 
    src_y=<value optimized out>, src_w=<value optimized out>, 
    src_h=<value optimized out>, drw_x=<value optimized out>, 
    drw_y=<value optimized out>, drw_w=<value optimized out>, 
    drw_h=<value optimized out>, image=0x8259fc0, 
    data=0xa2910000 "SerZFT\\UY[]\\YWX[ZPONIR__hhhtwmlimkhfhhb[UURROKOQPU\\]UMLPUZZSORTSTTSQPQTV`c^VZfjfhcdeca]VSX]XWZ[bfidciebkhvvpttnmsprmmomuurjgiffmztyz{zw}z~\201\200~\177\200\200\206\203\202\201~}}z\200\202\177s}\204w\177\205\202~}\177\201~yy\201\207\203\212}y\206\204s\201\210mboywhhh\204�\232\210\216\213\223\215tkss"..., sync=0, width=<value optimized out>, height=<value optimized out>)
    at ../../Xext/xvmain.c:730
No locals.
#4  0xb7c3a476 in ProcXvShmPutImage (client=0x8a13738)
    at ../../Xext/xvdisp.c:1180
	pDraw = (DrawablePtr) 0x8d798f8
	pPort = (XvPortPtr) 0x825a1f8
	pImage = (XvImagePtr) 0x8259fc0
	pGC = (GCPtr) 0x8ae7c20
---Type <return> to continue, or q <return> to quit---
	status = -1567555584
	size_needed = <value optimized out>
	i = <value optimized out>
	width = 720
	height = 576
#5  0x081506de in XaceCatchExtProc (client=0x8a13738) at ../../Xext/xace.c:299
	major = 140
	ext = <value optimized out>
#6  0x0808d8df in Dispatch () at ../../dix/dispatch.c:502
	result = <value optimized out>
	client = (ClientPtr) 0x8a13738
	nready = 0
	start_tick = 3760
#7  0x0807471b in main (argc=10, argv=0xbf8c59a4, envp=Cannot access memory at address 0xbc
)
    at ../../dix/main.c:452
	i = 1
	error = 136163204
	xauthfile = <value optimized out>
	alwaysCheckForInput = {0, 1}
(gdb)