Linux lain 3.7.0-hardened #1 SMP PREEMPT Mon Dec 17 03:03:30 CET 2012 x86_64
Intel(R) Core(TM) i3 CPU M 350 @ 2.27GHz GenuineIntel GNU/Linux

(Tested both on hardened and vanilla kernels)

[    2.719980] nouveau  [     DRM] 3 available performance level(s)
[    2.719984] nouveau  [     DRM] 0: core 135MHz shader 270MHz memory 135MHz
voltage 850mV
[    2.719987] nouveau  [     DRM] 1: core 405MHz shader 810MHz memory 405MHz
voltage 850mV
[    2.719989] nouveau  [     DRM] 3: core 625MHz shader 1530MHz memory 790MHz
voltage 1030mV
[    2.719992] nouveau  [     DRM] c: core 405MHz shader 810MHz memory 405MHz
voltage 850mV

echo 3 > /sys/class/drm/card0/device/performance_level

run opengl app (I run xonotic-glx)
at first you can move mouse a bit but it just hangs a bit later, after a while
X crashes

(It reclocks works fine when reclocking between 0 and 1)