"Disabling kernel mode setting is important, as the driver doesn't
appear to take advantage of KMS yet. If you do not deactivate KMS, your
system might freeze when trying to switch to a tty or even when shutting
down via your DE. "

Source: Arch Wiki

For Grub2, edit /etc/default/grub and add nomodeset to the kernel
parameter options, e.g.

GRUB_CMDLINE_LINUX_DEFAULT="nomodeset"

-- 
You received this bug notification because you are a member of Ubuntu-X,
which is subscribed to fglrx-installer in Ubuntu.
https://bugs.launchpad.net/bugs/750437

Title:
  fglrx hard lockup on shutdown

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/fglrx-installer/+bug/750437/+subscriptions

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