It's a rewrite of previous post. Now that my hp 540 notebook has been being tested for about  a week without freezing, I'm feeling brave to shout it to the world and maybe offer some help for fellow freezee (=freeze victim, :) ).
On my last post I wrote it in a way that I wouldn't understand when I was my first week with Ubuntu. So here's the easy step by step fix. But I am not sure if this is a universal fix, but at least it works on hp 540 notebook with Ubuntu 9.04 installed.

Victim :
hp 540 notebook (an Intel graphics based system) and Ubuntu,

Symptoms :

• Ubuntu 9.04 Jaunty Jackalope freezes, with only mouse can be moved around
• happens randomly, for no apparent trigger(s)
  

The Culprit :
Intel graphics driver.

The Fix, there are 2 steps :

1. use latest stable Intel Graphics driver, this is how :

• Go to System -> Administration -> Software Sources, type your password,
  
• Click Third-party Software tab, click "Add"
• add this line (without the quotes) :
  "deb http://ppa.launchpad.net/ubuntu-x-swat/x-updates/ubuntujaunty main"
  click Add Source
• go to this page  then save it as key.gpg
  
• click Authentication and then Import Key File, choose the file you saved on the previous step
  
• after that click reload,
• open your update manager, now your xserver-xorg-video-intel can be updated

2. edit xorg.conf :

• after the download and installation succeed, open your file manager as a root from Accessories -> Terminal and type sudo nautilus, open and edit /etc/x11/xorg.conf so it looks like this.
  ...
  Section "Device"
      Identifier    "Configured Video Device"
      Option "AccelMethod"    "UXA"
      Option "AccelMethod"    "XAA"
      Option "AccelMethod"    "EXA"
  EndSection
  ...
• save and restart your Ubuntu, done (hopefully).
  

This fix has a drawback however, it breaks suspending function. But I'll choose stable OS over suspending function any day, hope some updates will fix this without side effect.



keyword : ubuntu 9.04, jaunty jackalope, hp 540, freeze fix, mouse only