Intel DX58SO2 suspends fine: but only for the first few hours

[Bryce Nesbitt]

While I suspect a hardware bug... this is quality Intel hardware... and I do see a lot of Linux and Ubuntu specific problems with suspend mode (despite the dramatic energy savings possible on desktops):

The Intel DX58SO2 based desktop passes the Suspend/Resume test at
https://wiki.ubuntu.com/KernelTeam/SuspendResumeTesting
But fails if left suspended for somewhere between 4 and 10 hours.
When resumed after this delay the machine hard boots, usually leaving the USB
keyboard dead as well.

# cat /proc/cmdline
BOOT_IMAGE=/vmlinuz-2.6.38-8-generic root=UUID=8a67d411-9750-46e4-8a53-b2059e5a4eeb ro quiet splash,acpi_sleep=nonvs

# cat /etc/initramfs-tools/conf.d/resume
RESUME=UUID=86acb365-d5a4-4249-a28c-5ab4b694181b

# uname -a
Linux ubuntu 2.6.38-8-generic #42-Ubuntu SMP Mon Apr 11 03:31:24 UTC 2011 x86_64 x86_64 x86_64 GNU/Linux

# dmidecode
SMBIOS 2.5 present.
Processor Information
    Socket Designation: CPU 1
    Manufacturer: Intel(R) Corporation
    Version: Intel(R) Xeon(R) CPU E5607 @ 2.27GHz
    (ECC Memory is installed but apparently not actually working)

BIOS Information
    Vendor: Intel Corp.
    Version: SOX5820J.86A.0779.2011.0406.1511
    Release Date: 04/06/2011
    Characteristics:
        ACPI is supported
    BIOS Revision: 0.0
    Firmware Revision: 0.0

Handle 0x0007, DMI type 2, 20 bytes
Base Board Information
    Manufacturer: Intel Corporation
    Product Name: DX58SO2
    Version: AAG10925-205
    Features:
        Board is a hosting board
        Board is replaceable

ProblemType: Bug
DistroRelease: Ubuntu 11.04
Package: acpi (not installed)
ProcVersionSignature: Ubuntu 2.6.38-8.42-generic 2.6.38.2
Uname: Linux 2.6.38-8-generic x86_64
NonfreeKernelModules: nvidia
Architecture: amd64
CheckboxSubmission: 4e5b282abba8764bb19f56c3fa62d845
CheckboxSystem: daed2f3d6643b4a84b4520a2427f8c2b
Date: Tue Jun 28 00:14:07 2011
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release amd64 (20110426)
ProcEnviron:
 LANGUAGE=en_US:en
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: acpi
UpgradeStatus: No upgrade log present (probably fresh install)