Just had this issue twice after upgrading from qantal to raring :( I'm
getting "(EE) [mi] EQ overflowing.  Additional events will be discarded
until existing events are processed" in xorg log and system freezes and
I have to do a hard reset.

uname -a
Linux 3.8.0-19-generic #29-Ubuntu SMP Wed Apr 17 18:19:42 UTC 2013 i686 i686 
i686 GNU/Linux

lspci -v -s `lspci | awk '/VGA/{print $1}'`
00:02.0 VGA compatible controller: Intel Corporation 2nd Generation Core 
Processor Family Integrated Graphics Controller (rev 09) (prog-if 00 [VGA 
controller])
        Subsystem: Hewlett-Packard Company Device 2abf
        Flags: bus master, fast devsel, latency 0, IRQ 50
        Memory at fe000000 (64-bit, non-prefetchable) [size=4M]
        Memory at c0000000 (64-bit, prefetchable) [size=256M]
        I/O ports at f000 [size=64]
        Expansion ROM at <unassigned> [disabled]
        Capabilities: <access denied>
        Kernel driver in use: i915

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https://bugs.launchpad.net/bugs/1140716

Title:
  [regression] 3.5.0-26-generic and  3.2.0-39-generic GPU hangs on
  Sandybridge

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