Comment 8 for bug 58326

Have just noticed that setting acpi=off in the kernel boot options seems to make X work. It did not, however, work on the system I'd upgraded from Dapper to Edgy. This could be because of some pre-Edgy cruft or it may be that an update to a package in the 3-4 days since I last tried has made X at least work with ACPI disabled.

I had noticed that on booting I got a dozen or so messages on the system console which look possibly ACPI-related, like the below example :

Calling INT 0x15 (F000:F05E)
  EAX is 0x5F03