[ltp] T60p: Kernel patches required for suspend to ram?

[Henrique de Moraes Holschuh]

On Wed, 04 Oct 2006, Kristian Berge Nessa wrote:
> Are there any kernel patches required for ACPI suspend to ram to work properly 
> on a T60p running (vanilla) kernel 2.6.18, with SATA in 'Compability' mode?

Check http://thinkwiki.org, I'd expect people to have posted such patches
there...

> The machine seems to suspend fine, but on resume is left in a non-responding 
> state where the 'suspended' (moon) indicator is still lit, but the HDD & fan 
> is spun up. Nothing works except powering off.

Not even SysRQ (need sysrq support in the kernel to be active) ?

> And to top it off, Novell's SLED 10.1 works flawlessly wrt. ACPI 
> suspend/resume on the same machine. But I'm a little too addicted to Debian 
> to go that route just yet...

Let's try to find out what SuSE did :-)  These things are invaluable
information to get proper ThinkPad support into vanilla Linux...

> So, in essence, the question is: What magic have Suse done to their (2.6.15 
> based) kernel in order for this to work, that is not yet in the mainline 
> 2.6.18 kernel?

1. AHCI suspend/resume
2. ACPI support for SATA ACPI handles (those hit LKML very recently)
3. MSI/MSI-X fixes, PCI config space fixes (AFAIK, 2.6.18 has those)

> I do suppose the 'AHCI patches' have no effect when I'm 
> running 'Compatibility' mode, or am I wrong?

I am not sure... do you *have* AHCI support in the kernel? They won't matter
if, and only if, ata_piix is the *only* driver talking to the ICH7.

-- 
  "One disk to rule them all, One disk to find them. One disk to bring
  them all and in the darkness grind them. In the Land of Redmond
  where the shadows lie." -- The Silicon Valley Tarot
  Henrique Holschuh