[Bug 54583] [Ubuntu 12.04 LTS 32-bit] Occasional ATI Radeon 9800 Pro and Intel D815EEA2 ACPI S3 State Resume Freeze

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=54583

--- Comment #9 from Alex Deucher <agd5f at yahoo.com> 2012-09-09 14:28:52 UTC ---
(In reply to comment #8)
> Is it possible you can give me detailed instructions on how to do this?
> I have gone to grub by pressing shift key during boot, and furthermore pressed
> e key to edit the boot script.

That's correct.  Just append radeon.agpmode=-1 to the kernel line.

> I don't know how to make the change permanent from grub's simple editor.
> How to I know from Ubuntu's GUI that I am running in PCI mode instead of AGP
> mode?

To make it permanent, edit the /etc/grub2.cfg and manually make the change. 
You can check the radeon dmesg messages to see whether the card is loaded in
AGP or non-AGP mode.

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