I've upgraded kernel and tried to start Xorg (xfce + compiz inside). It crashs with the following backtrace:

(gdb) bt
#0  __lll_lock_wait () at ../nptl/sysdeps/unix/sysv/linux/x86_64/lowlevellock.S:130
#1  0x00007f98b9ff9a58 in _L_lock_102 () from /lib/libpthread.so.0
#2  0x00007f98b9ff935e in __pthread_mutex_lock (mutex=0x114a5b0) at pthread_mutex_lock.c:86
#3  0x00007f98b6b51825 in drm_intel_gem_bo_unmap (bo=0x45c93b0) at intel_bufmgr_gem.c:768
#4  0x00007f98b6d74df8 in intel_batch_flush (pScrn=0x1143cb0, flushed=128) at i830_batchbuffer.c:196
#5  0x00007f98b6d74671 in I830Sync (pScrn=0x1143cb0) at i830_accel.c:195
#6  0x00007f98b6d81610 in I830LeaveVT (scrnIndex=<value optimized out>, flags=<value optimized out>) at i830_driver.c:3625
#7  0x0000000000467409 in AbortDDX () at xf86Init.c:1507
#8  0x00000000004f680d in AbortServer () at log.c:407
#9  0x00000000004f6eb5 in FatalError (f=0x573030 "Caught signal %d.  Server aborting\n") at log.c:553
#10 0x0000000000481de9 in xf86SigHandler (signo=11) at xf86Events.c:593
#11 <signal handler called>
#12 drm_intel_gem_bo_unreference_locked (bo=0x45bb9a0) at intel_bufmgr_gem.c:585
#13 0x00007f98b6b5239c in drm_intel_gem_bo_unreference (bo=0x45bb9a0) at intel_bufmgr_gem.c:599
#14 0x00007f98b6d9dbc2 in i830_uxa_destroy_pixmap (pixmap=0x45bb950) at i830_exa.c:933
#15 0x000000000052ca0d in damageDestroyPixmap (pPixmap=0x45bb950) at damage.c:1680
#16 0x00007f98b7a95fe5 in XvDestroyPixmap (pPix=0x45bb950) at xvmain.c:381
#17 0x0000000000517488 in FreePicture (value=<value optimized out>, pid=<value optimized out>) at picture.c:1528
#18 0x0000000000435433 in FreeResource (id=35651715, skipDeleteFuncType=0) at resource.c:561
#19 0x000000000051e4be in ProcRenderFreePicture (client=0x473b000) at render.c:690
#20 0x000000000044c2f4 in Dispatch () at dispatch.c:454
#21 0x0000000000432b3d in main (argc=9, argv=0x7fffc2832ce8, envp=<value optimized out>) at main.c:438
Current language:  auto; currently asm

This problem was also reported http://bugs.gentoo.org/264252 and it was provided quite a similar backtrace there. That's with:

x11-base/xorg-server-1.5.3-r5
sys-kernel/gentoo-sources-2.6.29-r1
x11-drivers/xf86-video-intel-2.6.3-r1

Probably this exact problem is fixed by newer intel drivers but after I upgraded intel drivers on a newer version I got more problems I'll report in next bug report. If this problem was fixed, could you point us on patch to fix this issue? Thank you.