Comment 21 for bug 141063

The backtrace I get:
#0 XkbEnableDisableControls (xkbi=0x180, change=542, newValues=512,
    changes=0x0, cause=0xbfae01d4) at ../../xkb/xkbUtils.c:748
#1 0x0818d5f1 in XkbRemoveResourceClient (inDev=0x826f040, id=1096810496)
    at ../../xkb/xkbEvents.c:1014
#2 0x08085542 in CloseDevice (dev=0x826f040) at ../../dix/devices.c:602
#3 0x080857a9 in CloseDownDevices () at ../../dix/devices.c:624
#4 0x081ba4e3 in AbortServer () at ../../os/log.c:405
#5 0x081baa66 in FatalError (
    f=0x81c4f4c "Caught signal %d. Server aborting\n") at ../../os/log.c:552
#6 0x080c64bd in xf86SigHandler (signo=11)
    at ../../../../hw/xfree86/common/xf86Events.c:764
#7 0xffffe420 in ?? ()
#8 0x0000000b in ?? ()
#9 0x00000033 in ?? ()
#10 0xc0100000 in ?? ()
#11 0x0000007b in ?? ()
#12 0x0000007b in ?? ()
#13 0x08218e80 in ?? ()
#14 0x08ecf5f0 in ?? ()
#15 0xbfae0618 in ?? ()
#16 0xbfae0600 in ?? ()
#17 0xb7affeec in ?? () from /usr/lib/xorg/modules/drivers//intel_drv.so
#18 0x00000016 in ?? ()
#19 0xb7e0cff4 in ?? () from /lib/i686/cmov/libc.so.6
#20 0xfff60700 in ?? ()
#21 0x0000000e in ?? ()
#22 0x00000007 in ?? ()
#23 0xb7ad9075 in i830_free_memory (pScrn=0x8217aa0, mem=0x8ecf5f0)
    at ../../src/i830_memory.c:240
#24 0xb7adcdea in I830StopVideo (pScrn=0x8217aa0, data=0x8267924, shutdown=1)
    at ../../src/i830_video.c:1018
#25 0xb7adceeb in i830_crtc_dpms_video (crtc=0x8219fa8, on=0)
    at ../../src/i830_video.c:2846
#26 0xb7ace1e0 in i830_crtc_dpms (crtc=0x8219fa8, mode=3)
    at ../../src/i830_display.c:713
#27 0x080f0f3e in xf86DPMSSet (scrn=0x8217aa0, mode=3, flags=0)
    at ../../../../hw/xfree86/modes/xf86Crtc.c:1961
#28 0x080f162e in xf86SaveScreen (pScreen=0x8225fe8, mode=0)
    at ../../../../hw/xfree86/modes/xf86Crtc.c:1987
#29 0x0807caa3 in SaveScreens (on=2, mode=1) at ../../dix/window.c:3453
#30 0x080c5942 in DPMSSet (level=1)
    at ../../../../hw/xfree86/common/xf86DPMS.c:160
#31 0x081acb69 in ScreenSaverTimeoutExpire (timer=0x86562e0, now=2036720,
    arg=0x0) at ../../os/WaitFor.c:631
#32 0x081ace74 in DoTimer (timer=0x86562e0, now=542, prev=0x180)
    at ../../os/WaitFor.c:459
#33 0x081ad607 in WaitForSomething (pClientsReady=0xbfae0a50)
    at ../../os/WaitFor.c:293
#34 0x0808ce82 in Dispatch () at ../../dix/dispatch.c:425
#35 0x0807461b in main (argc=8, argv=0xbfae0f74, envp=
Cannot access memory at address 0x188
) at ../../dix/main.c:452