[ltp] help in troubleshooting ACPI drain with 2.6.10 please

[Bob Alexander]

T40 (2373-92G), plain 2.6.10 kernel (even though same seems to apply to 
2.6.10-rc3-mm1).

Sleep to RAM: excessive battery drain (approx. 9% per hour of an high 
capacity batt) and devices remain lit (USB mouse, network plug and 
ultrabay light).

Under APM (and 2.6.9) the following:
modprobe -r usbhid
modprobe -r uhci_hcd
modprobe -r ehci_hcd

turned the USB attached mouse light off. Now it disables it's function 
but light stays onn.

Follows list of modules.

Thank you for any help.

(Related question: when I try a modprobe -r of a module and it refuses 
saying it's in use, how can I discover by what ?)

Bob

Module                  Size  Used by
radeon                135588  2
pcmcia                 22660  4
thermal                13256  0
fan                     4420  0
button                  6544  0
processor              19564  1 thermal
ac                      4740  0
battery                10052  0
ipv6                  260864  12
ipt_REJECT              7040  4
ipt_pkttype             1600  4
ipt_LOG                 6912  10
ipt_state               1856  16
ipt_multiport           1984  0
ipt_conntrack           2496  4
iptable_mangle          2752  0
ip_nat_irc              4464  0
ip_nat_tftp             3824  0
ip_nat_ftp              5104  0
iptable_nat            25736  3 ip_nat_irc,ip_nat_tftp,ip_nat_ftp
ip_conntrack_irc       71792  1 ip_nat_irc
ip_conntrack_tftp       4080  0
ip_conntrack_ftp       72752  1 ip_nat_ftp
ip_conntrack           47284  9 
ipt_state,ipt_conntrack,ip_nat_irc,ip_nat_tftp,ip_nat_ftp,iptable_nat,ip_conntrack_irc,ip_conntrack_tftp,ip_conntrack_ftp
iptable_filter          3648  1
ip_tables              19136  9 
ipt_REJECT,ipt_pkttype,ipt_LOG,ipt_state,ipt_multiport,ipt_conntrack,iptable_mangle,iptable_nat,iptable_filter
usbhid                 25408  0
ehci_hcd               31492  0
uhci_hcd               34000  0
usbcore               121912  4 usbhid,ehci_hcd,uhci_hcd
e1000                  88244  0
yenta_socket           22080  0
pcmcia_core            56640  2 pcmcia,yenta_socket
nls_iso8859_15          4544  1
ntfs                  112048  1
nls_iso8859_1           3968  1
nls_cp437               5632  1
vfat                   14272  1
fat                    42336  1 vfat
dm_mod                 60540  5
ibm_acpi               16508  0