[ltp] loading lt_hotswap on boot kills ibm_acpi: Thinkpad T30

[kaens]

Alright, so I have a Thinkpad T30 running Ubuntu Dapper without much
of a problem. I did notice, however, that the system would freeze if I
hotswapped an optical drive for a battery in the Ultra-bay slot.

 There is a module called lt_hotswap that monitors the slot, and sends
the eject command to ibm_acpi (I do believe) if the release lever is
pulled. It works perfectly fine if I load it when my system is already
booted.

 I'd really like to have this loaded at boot time though - so I added
lt_hotswap to /etc/modules, and the one configuration option it has to
/etc/modules.d/options as options lt_hotswap auto_eject=1.

 That should load the module on boot, right? And it does.

 dmesg | grep hotswap produces
[17179849.068000] Laptop ultrabay hotswap driver version 0.3.6
[17179849.068000] lt_hotswap: '\_SB.PCI0.LPC.EC.BAT1' found (Hot-Swappable)
[17179849.068000] lt_hotswap: '\_SB.PCI0.IDE0.SCND.MSTR' found (Hot-Swappable)
[17179849.068000] lt_hotswap: '\_SB.PCI0.PCI1.DOCK.IDE1.PRIM.MSTR'
found (Non-Swappable)
[17179849.068000] lt_hotswap: '\_SB.PCI0.LPC.FDC.FDD0' found (Hot-Swappable)
[17179849.068000] lt_hotswap: '\_SB.PCI0.PCI1.DOCK' found (Hot-Swappable)

 However, when it boots, /proc/acpi/ibm is entirely missing. The /dev/
files didn't get made, and dmesg | grep ibm produces:
 	
 	
ibm_acpi: IBM ThinkPad ACPI Extras v0.12a
ibm_acpi: http://ibm-acpi.sf.net/
ibm_acpi: dock device not present
ibm_acpi: acpi_install_notify_handler(bay) failed: 7

 I found out that lt_hotswap needs to be loaded after all other ACPI
modules are loaded, and I suspect that this is the problem. Any
confirmation on that? I've also read that udev does not load modules
in any specific order - so is there any way around this other than
adding something to xinitrc or bashrc (or wherever would be
appropriate) or running a script on login? That seems like an ugly
solution to me, but I'll do it if I need to - It does work seamlessly
if it's loaded after boot.

 Sigh.

 Any feedback would be appreciated.