That's an interesting note. My mom has a Vaio laptop (don't know the model number off the top of my head, but it's a C2D so reasonably new) that also only resumes with a power button press. All the other laptops I've used with Linux resume on a lid open, so I just assumed that was a Vaio specific bug or a problem with her machine (it was a refurb). If there's a difference in sleep modes related to the power-button-to-wake phenomena, that would be an avenue to explore.
That's an interesting note. My mom has a Vaio laptop (don't know the model number off the top of my head, but it's a C2D so reasonably new) that also only resumes with a power button press. All the other laptops I've used with Linux resume on a lid open, so I just assumed that was a Vaio specific bug or a problem with her machine (it was a refurb). If there's a difference in sleep modes related to the power-button- to-wake phenomena, that would be an avenue to explore.