Ubuntu :: Cpu Monitor Doesn't Continue To Update?

Over the past two weeks my laptop has started locking up at random. I thought maybe it was a thermal issue, because I have an upgraded hard drive (put in 2 years ago) and once a month or so I might get a heat related lockup. I keep my fans running at high speed and the laptop elevated now and don't typically have an issue.

The freezing has started to become a daily occurrence now, and yesterday it locked up three times. I am able to move my mouse (unlike thermal lockups where everything goes down) but unable to click anything. The entire display freezes, and my cpu monitor doesn't continue to update.

I finally ssh'd into my laptop and was surprised to see it responding just fine. htop showed that my X-server was at 100%. When I killed it, X restarted automatically and promped me to log in. Everything is fine after this until the next lockup.

When I don't have access to ssh I have to hard-shutoff the laptop. That can't be good on this 5 year old macbook. I have done my system updates in the past two weeks that may have triggered this, but I don't remember anything specifically. I've tried all versions of my kernel that are installed but nothing, I have the intel video and have not had problems with it up until now.

2$ uname -a
Linux macbook 2.6.32-30-generic #59-Ubuntu SMP Tue Mar 1 21:30:46 UTC 2011 x86_64 GNU/Linux
3$ lspci|grep VGA
00:02.0 VGA compatible controller: Intel Corporation Mobile 945GM/GMS, 943/940GML Express Integrated Graphics Controller (rev 03)

Can anyone suggest something to try? I'm not sure how to go back to older versions of the the video drivers, but I'm not even sure if that is the issue. I did add the following to /etc/apt/sources.lst after the lockups started occuring:

Code:
# X
deb http://ppa.launchpad.net/ubuntu-x-swat/x-updates/ubuntu lucid main #X-Updates PPA
deb-src http://ppa.launchpad.net/ubuntu-x-swat/x-updates/ubuntu lucid main #X-Updates PPA
and did a full update, but this hasn't helped.

I'm running Ubuntu 10.04 LTS