[Bug 156079] Suspend to RAM does not work with 4 GB of RAM.

[Sun]

Public bug reported:

I have a Gigabyte GA-K8N Pro-SLU motherboard with a 64-bit CPU with 4 GB
of DDR-400 RAM installed and I am running a 64-bit version of Ubuntu
7.10 Gutsy.

The BIOS by default have support for 4 GB of RAM turned off. While it is
turned off, the Ubuntu is able to access a little bit more than 3 GB of
installed RAM. In this case Suspend works out of the box, it just works.

However, when I turned on 4 GB RAM support in the BIOS, Suspend to RAM
cease to work. It seems to be able to suspend - the fans are turned off
and such, but when I try to wake it up it just reboots. I have tried to
play around with POST_VIDEO and other options in /etc/default/acpi-
support, but were not able to make it work until I turn off 4 GB RAM
support in the motherboard BIOS.

Now, I have no ideas if this is a OS problem or hardware... so I want to
ask if anyone have any experience with this, like if there are some BIOS
options that need to be turned on? In power management(BIOS) I have
turned on STR(S3).

Thanks.

$ uname -a
Linux bed 2.6.22-14-generic #1 SMP Sun Oct 14 21:45:15 GMT 2007 x86_64 GNU/Linux

** Affects: acpi-support (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: linux-meta (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: acpi-support (Baltix)
     Importance: Undecided
         Status: Invalid


** Tags: 4gb acpi amd64 ram suspend x64

-- 
Suspend to RAM does not work with 4 GB of RAM.
https://bugs.launchpad.net/bugs/156079
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