This bug also affects me:

cory@lala:~$ lspci -v -s `lspci | awk '/VGA/{print $1}'`
00:02.0 VGA compatible controller: Intel Corporation 82Q963/Q965 Integrated 
Graphics Controller (rev 02) (prog-if 00 [VGA controller])
        Subsystem: Lenovo Device 1010
        Flags: bus master, fast devsel, latency 0, IRQ 26
        Memory at d0000000 (32-bit, non-prefetchable) [size=1M]
        Memory at c0000000 (64-bit, prefetchable) [size=256M]
        I/O ports at 3400 [size=8]
        Expansion ROM at <unassigned> [disabled]
        Capabilities: <access denied>
        Kernel driver in use: i915

The switching from "sna" to "uxa" works as a temporary workaround for
me:

cory@lala:~$ cat /usr/share/X11/xorg.conf.d/20-intel.conf
Section "Device"
   Identifier  "Intel Graphics"
   Driver      "intel"
   Option   "AccelMethod" "uxa"
EndSection

-- 
You received this bug notification because you are a member of Ubuntu-X,
which is subscribed to xserver-xorg-video-intel in Ubuntu.
https://bugs.launchpad.net/bugs/1507255

Title:
  Garbled graphics in Wily with Intel GMA4500 chip

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https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/1507255/+subscriptions

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