On Tue, 18 Dec 2007, Rhialto wrote:
> This is with my "Targa Visionary 1900+" laptop and joerg's kernel.
>
>>   # sysctl -w machdep.sleep_state=3
>
> acpi0: entering state 3
> acpi0: cannot enter the sleep state (3)

Your firmware doesn't implement ACPI suspend to RAM.

>>   # sysctl -w machdep.sleep_state=2
>
> acpi0: entering state 2
> acpi0: cannot enter the sleep state (2)

I'm not aware of a single vendor that implements ACPI S2.

>>   # sysctl -w machdep.sleep_state=1
>
> seems to turn off DRAM refresh since my screen starts to fade pixelwise.
> It comes back if I press a key but the machine remains hanging.

Hrm, I haven't tested S1 in years -- can you raise a PR?

Cheers,
Jared