Public bug reported:

Binary package hint: linux-image-2.6.22-14-generic

I have an ABIT NF-M2S MotherBoard (NVIDIA GeForce 6100+405 Chipset)
With Feisty everything worked perfectly.
When I upgraded to Gutsy, I found that the system clock was running way too 
fast than normal, as well as keyboard repetition, mouse pointer animations, and 
other problems with many applications because of the abnormal speed of the 
clock. Furthermore, the NVDIA proprietary driver apparently works but the 
computer freezes if you try to restart the X server.

I tried to disable acpi at boot time (acpi=off): the clock works
properly, but I can't shutdown the system (and restarting the X server
always freezes the system).

I tried with a fresh Gutsy install, both 32 and 64 bit version, but the problem 
is always the same.
I tried many other things, including reconfiguring X through "dpkg-reconfigure 
-phigh xserver-xorg" and even manually (I have tried vesa, nvidia, nv), but 
with no results as for the clock abnormal speed (with vesa drivers the x server 
can be restarted, but there is no 3d support...).

Finally, I downgraded the kernel to Feisty's one (2.6.20-16), and
everything works fine (for some reason, I had to downgrade also gnome-
mount to mount USB devices correctly in gnome), apart the NVIDIA
proprietary driver  (restarting X always freezes the system, unless you
use the vesa driver or the old nvidia-legacy driver).

So I think that there is a problem with kernel 2.6.22-14 and ABIT NF-M2S
and/or NVIDIA GeForce 6100+405 Chipset.

ANOTHER USER REPORTED THE SAME PROBLEM HERE, AND I REPLIED:
http://ubuntuforums.org/showthread.php?t=636772

** Affects: linux-source-2.6.22 (Ubuntu)
     Importance: Undecided
         Status: New

-- 
Upgrade from Feisty to Gutsy: system clock way too fast than normal and 
shutdown does not work on ABIT NF-M2S + restarting X freezes the system
https://bugs.launchpad.net/bugs/187092
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