Comment 6 for bug 333990

Indeed it seems this is only enabled in Lucid for powerpc-smp:

ogasawara@emiko:~/ubuntu-lucid/debian.master/config$ grep -rn "CONFIG_PCIEASPM" *
config.common.ports:2325:# CONFIG_PCIEASPM_DEBUG is not set
config.common.ubuntu:2793:# CONFIG_PCIEASPM is not set
ia64/config.common.ia64:162:# CONFIG_PCIEASPM is not set
powerpc/config.flavour.powerpc:30:# CONFIG_PCIEASPM is not set
powerpc/config.flavour.powerpc-smp:31:CONFIG_PCIEASPM=y
powerpc/config.flavour.powerpc64-smp:31:# CONFIG_PCIEASPM is not set

However, examining this config option a bit closer it seems this is noted as being experimental. We typically don't enable experimental options. I'll try to raise this for discussion to get additional input. Thanks.

config PCIEASPM
        bool "PCI Express ASPM support(Experimental)"
        depends on PCI && EXPERIMENTAL && PCIEPORTBUS
        default n
        help
          This enables PCI Express ASPM (Active State Power Management) and
          Clock Power Management. ASPM supports state L0/L0s/L1.