Same problem here on lenovo laptop W520: 3.5.0-27 hangs on boot,
3.5.0-26 boots fine. Packages are all updated.
00:02.0 VGA compatible controller: Intel Corporation 2nd Generation Core
Processor Family Integrated Graphics Controller (rev 09) (prog-if 00 [VGA
controller])
Subsystem: Lenovo Device 21d1
Flags: bus master, fast devsel, latency 0, IRQ 50
Memory at f2400000 (64-bit, non-prefetchable) [size=4M]
Memory at e0000000 (64-bit, prefetchable) [size=256M]
I/O ports at 6000 [size=64]
Expansion ROM at <unassigned> [disabled]
Capabilities: <access denied>
Kernel driver in use: i915
Kernel modules: i915
01:00.0 VGA compatible controller: NVIDIA Corporation GF106GLM [Quadro 2000M]
(rev a1) (prog-if 00 [VGA controller])
Subsystem: Lenovo Device 21d1
Flags: bus master, fast devsel, latency 0, IRQ 16
Memory at f0000000 (32-bit, non-prefetchable) [size=32M]
Memory at c0000000 (64-bit, prefetchable) [size=256M]
Memory at d0000000 (64-bit, prefetchable) [size=64M]
I/O ports at 5000 [size=128]
Expansion ROM at f2000000 [disabled] [size=512K]
Capabilities: <access denied>
Kernel driver in use: nouveau
Kernel modules: nouveau, nvidiafb
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https://bugs.launchpad.net/bugs/1158562
Title:
system will not start after updating to kernel 3.5.0-27
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