Problematic version/package:

xserver-xorg-video-intel_2%3a2.20.10+git20121015.b42d81b6-0ubuntu0sarvatt~precise_i386.deb

Causes: lots of color corruption on screen. Switching windows redraws and gets different corruption at each time. Some text becomes unintelliglbe. Some background/foreground colors are simply switched.

The xorg-edgers repo suggests filing bug reports directly here, so I did.

Downgrading back to the older:

xserver-xorg-video-intel_2%3a2.20.9+git20121001.51202798-0ubuntu0sarvatt~precise_i386.deb resolved the problem.

fixed the problem.

I have a Zenbook Prime laptop by Asus.

uname -a:

Linux eyal-zenbookp 3.5.0-17-generic #26-Ubuntu SMP Thu Oct 4 08:15:04 UTC 2012 i686 i686 i386 GNU/Linux

This is my graphics hardware:

00:02.0 VGA compatible controller: Intel Corporation Ivy Bridge Graphics Controller (rev 09) (prog-if 00 [VGA controller])
        Subsystem: ASUSTeK Computer Inc. Device 1517
        Flags: bus master, fast devsel, latency 0, IRQ 42
        Memory at f7800000 (64-bit, non-prefetchable) [size=4M]
        Memory at e0000000 (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
        Kernel modules: i915