Kernel not recognizing your hardware? Problems with power management or PCMCIA? What hardware is compatible with Gentoo? See here. (Only for kernels supported by Gentoo.)
That output is in the topic title!
03:00.0 IDE interface: Marvell Technology Group Ltd. Device 6121 (rev b1)
Ah, but I see a long thread about it! Well, thanks, but it looks like there is no mainline kernel support for it in 2.6.24.. Latest tuxonice sources! It is supported in newer gentoo-sources, so I just have to wait. Don't want to waste time with it.