I have the exact behavior from this post. ( i founded here this bug :)
http://ubuntuforums.org/showthread.php?t=236531


Error in I830WaitLpRing(), now is 1258277, start is 1256276
pgetbl_ctl: 0x3ef80001 pgetbl_err: 0x0
ipeir: 0 iphdr: 0
LP ring tail: f8 head: 0 len: 1f001 start 0
eir: 0 esr: 1 emr: ffdf
instdone: 0 instpm: 10
memmode: 0 instps: 0
hwstam: dffe ier: 82 imr: 0 iir: 70
space: 130816 wanted 131064
(II) I810(0): [drm] removed 1 reserved context for kernel
(II) I810(0): [drm] unmapping 8192 bytes of SAREA 0xf8feb000 at 0xb79c8000
(II) I810(0): [drm] Closed DRM master.

Fatal server error:
lockup

(II) AIGLX: Suspending AIGLX clients for VT switch
Error in I830WaitLpRing(), now is 1260337, start is 1258336
pgetbl_ctl: 0x3ef80001 pgetbl_err: 0x0
ipeir: 0 iphdr: 0
LP ring tail: 100 head: 0 len: 1f001 start 0
eir: 0 esr: 1 emr: ffdf
instdone: 0 instpm: 10
memmode: 0 instps: 0
hwstam: dffe ier: 82 imr: 0 iir: 70
space: 130808 wanted 131064

FatalError re-entered, aborting
lockup

** Attachment added: "Xorg.0.log.old"
   http://launchpadlibrarian.net/13598935/Xorg.0.log.old

-- 
xserver-xorg-driver-i810: Error in I830WaitLpRing(), now is -99922196,  start 
is -99924197
https://bugs.launchpad.net/bugs/56501
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