Comment 37 for bug 501323

I see from your BootDmesg.txt file:
[ 0.000000] Kernel command line: BOOT_IMAGE=/boot/vmlinuz-2.6.31-17-generic root=UUID=1257db60-9fbe-4a1c-aad6-9303cbff6640 ro quiet splash noacpi

The noacpi option here is not the default as far as I know, you did add it?
From http://www.kernel.org/doc/Documentation/kernel-parameters.txt :
 acpi= [HW,ACPI,X86]
   Advanced Configuration and Power Interface
   Format: { force | off | ht | strict | noirq | rsdt }
   force -- enable ACPI if default was off
   off -- disable ACPI if default was on
   noirq -- do not use ACPI for IRQ routing
   ht -- run only enough ACPI to enable Hyper Threading
   strict -- Be less tolerant of platforms that are not
    strictly ACPI specification compliant.
   rsdt -- prefer RSDT over (default) XSDT

   See also Documentation/power/pm.txt, pci=noacpi

Well, I am not a developer, just a bug triager. But it looks like you are saying by this noacpi option, not to use Advanced Configuration and Power Interface (ACPI) which seems likely not to help suspending.

Now that we are using Grub2 rather than plain old grub, I think I am a bit lost as to where it must be changed. But I guess you can test different values by pressing 'e' to edit the command in grub menu before doing Enter.

Also, although it does make sense for me to update BIOS, it can be risky (especially if current goes out during the procedure)... so you have to know and accept the risk.