Jennifer Cash, could you please execute the following via a terminal and post 
the results:
sudo dmidecode -s bios-version && sudo dmidecode -s bios-release-date

Regarding your comments 
https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1309153/comments/4 :
>"I also want to note that I started having these symptoms while using 12.04 
>(but only since about January, I ran 12.04 up to that point with no issues)."

Could you please comment further to your setup:
+ What version of 12.04, 12.04.1, 12.04.2, etc.?
+ Were you using the nvidia proprietary drivers? If so, which version?

** Changed in: xorg (Ubuntu)
   Importance: Low => Medium

** Summary changed:

- NVRM: os_pci_init_handle: invalid context!
+ 10de:06fd [HP Z400 Workstation] NVRM: os_pci_init_handle: invalid context!

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https://bugs.launchpad.net/bugs/1309153

Title:
  10de:06fd [HP Z400 Workstation] NVRM: os_pci_init_handle: invalid
  context!

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