I've found a workaround. Adding i915.i915_enable_rc6=0 to the kernel
options in grub makes all work fine.
This is my hardware :
CPU INFO
processor : 0
vendor_id : GenuineIntel
cpu family : 6
model : 42
model name : Intel(R) Core(TM) i5-2400 CPU @ 3.10GHz
Base Board Information
Manufacturer: Gigabyte Technology Co., Ltd.
Product Name: H67M-D2
BIOS Information
Vendor: Award Software International, Inc.
Version: F7
Release Date: 11/26/2010
VGA INFO:
VGA compatible controller: Intel Corporation 2nd Generation
Core Processor Family
Integrated Graphics Controller (rev 09) (prog-if 00 [VGA
controller])
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https://bugs.launchpad.net/bugs/978286
Title:
[12.04] [sandybridge]freeze after login in greeter
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