Comment # 13 on bug 903560 from grant k

cat /proc/acpi/wakeup
    Device  S-state   Status   Sysfs node
    P0P8      S4    *disabled  pci:0000:00:02.0
    P0P9      S4    *disabled  pci:0000:00:03.0
    P0PA      S4    *disabled  pci:0000:00:04.0
!!    PS2K      S4    *enabled   pnp:00:05
    PS2M      S4    *disabled  pnp:00:06
!!    USB0      S4    *enabled   pci:0000:00:0b.0
!!    USB2      S1    *enabled   pci:0000:00:0b.1
    NMAC      S5    *disabled  pci:0000:00:14.0
    P0P1      S4    *disabled  pci:0000:00:10.0
    HDAC      S4    *disabled  pci:0000:00:10.1
    MC97      S4    *disabled
    NSMB      S4    *disabled  pci:0000:00:0a.1
    SLPB      S4    *disabled

echo PS2K > /proc/acpi/wakeup
echo USB0 > /proc/acpi/wakeup
echo USB2 > /proc/acpi/wakeup

cat /proc/acpi/wakeup
    Device  S-state   Status   Sysfs node
    P0P8      S4    *disabled  pci:0000:00:02.0
    P0P9      S4    *disabled  pci:0000:00:03.0
    P0PA      S4    *disabled  pci:0000:00:04.0
    PS2K      S4    *disabled  pnp:00:05
    PS2M      S4    *disabled  pnp:00:06
    USB0      S4    *disabled  pci:0000:00:0b.0
    USB2      S1    *disabled  pci:0000:00:0b.1
    NMAC      S5    *disabled  pci:0000:00:14.0
    P0P1      S4    *disabled  pci:0000:00:10.0
    HDAC      S4    *disabled  pci:0000:00:10.1
    MC97      S4    *disabled
    NSMB      S4    *disabled  pci:0000:00:0a.1
    SLPB      S4    *disabled

shutdown -h now

has no effect; system still restarts