Comment 35 for bug 115283

The same things happens for me (lockup, mouse works, ctrl-alt-fn doesn't, magic sysrq does):

ASUS G1 laptop:
01:00.0 VGA compatible controller [0300]: nVidia Corporation GeForce Go 7700 [10de:0397] (rev a1)
Gutsy was installed from the beta DVD, but I'm using my old home directory (and therefore old settings).

ii compiz 1:0.6.0+git20071004-0ubuntu2
ii compiz-core 1:0.6.0+git20071004-0ubuntu2
ii compiz-fusion-plugins-extra 0.5.2+git20070928-0ubuntu1
ii compiz-fusion-plugins-main 0.5.2+git20070928-0ubuntu2
ii compiz-gnome 1:0.6.0+git20071004-0ubuntu2
ii compiz-plugins 1:0.6.0+git20071004-0ubuntu2
ii compizconfig-settings-manager 0.5.2+git20070912-0ubuntu1
ii libcompizconfig-backend-gconf 0.5.2+git20071005-0ubuntu2
ii libcompizconfig0 0.5.2+git20070919-0ubuntu3
ii python-compizconfig 0.5.2+git20070912-0ubuntu1

ii xorg 1:7.2-5ubuntu12
ii xserver-xorg-core 2:1.3.0.0.dfsg-12ubuntu8

ii nvidia-glx-new 100.14.19+2.6.22.4-13.6
ii nvidia-kernel-common 20051028+1ubuntu7

Without compiz it works fine. From my perspective I don't think compiz (at least on nvidia) is quite ready for prime time yet.