How to hotswap the UltraBase
- Uses lt_hotswap to preserve DMA on re-insert
- Idiot-proof (somewhat)
- Scripts also work without lt_hotswap (using the older way, idectl).
- Makes use of ThinkPad beeps to inform user.
- X22 ThinkPad + UltraBase + DVD-R
- lt_hotswap version 0.3.9
- xorg 6.9.0
First, make sure the lt_hotswap module is loaded. Add this to /etc/rc.local (or use modprobe.preload, if you prefer)
echo "Loading lt_hotswap module" modprobe lt_hotswap hdc_dock=1
Disable the existing lths script. Here is the modified /etc/acpi/events/lths:
# Call the LTHS script event=lths.* #action=/usr/local/sbin/lths.sh %e action=echo "Not invoking lths.sh; this is now done by the ultrabase_eject and insert scripts instead."
Respond to an ultrabase eject event. Here is /etc/acpi/events/ultrabase_eject
#Ultrabase eject button has been pressed #We can be triggered by an ibm/bay event if NOT using lt_hotswap, or an lt_hotswap event if we are. event=ibm/bay.MSTR.00000003.00000000 event=lths.MSTR.00000003.00000000 action=/etc/acpi/actions/ultrabase_eject.sh
Respond to an ultrabase insert event. Here is /etc/acpi/events/ultrabase_insert
#Ultrabase has been re-inserted #We can be triggered by an ibm/bay event if NOT using lt_hotswap, or an lt_hotswap event if we are. event=ibm/bay.MSTR.00000001.00000000 event=lths.MSTR.00000001.00000000 action=/etc/acpi/actions/ultrabase_insert.sh
This is the actual script which does the ejection. It is /etc/acpi/actions/ultrabase_eject.sh
- Note the dependency on cddb-id.
#!/bin/bash echo "syncing disks for safety" sync echo "Unregistering IDE interface for CDROM and preparing to eject." #Note: the BIOS will already deal with the ultrabay LED (number 3). It will: # * turn it on when the bay is loaded # * turn it off when the bay is unloaded # * blink it when it is waiting between an eject request and an eject. (Linux never takes long enough to see this!) #What if there is a disk in the drive? #Case 1: there is an umounted CDROM, or an AudioCD/DVD which is NOT playing. # => It's OK to proceed. #Case 2: there is a mounted CDROM. # => we MUST unmount it, or give up on ejecting. if grep hdc /proc/mounts >/dev/null; then echo "There is a mounted filesystem on /dev/hdc. Trying to unmount it" umount /dev/hdc if [ $? == 0 ]; then echo "Successfully unmounted the CDROM." else echo "The CDROM is busy; can't unmount. Do not try to undock." echo 9 > /proc/acpi/ibm/beep #This is an "unhappy, warning beep" exit 1 fi fi #Case 3: there is a AudioCD/DVD which is currently playing. #How do we detect this? It could be just using cdplay (which has no associated process) #The following methd is ugly, and it requires the cddb-id program. However, it does work. #Assuming that we have already ruled out a mounted filesystem, then... CDDBID=$(cddb-id /dev/hdc 2>/dev/null) if [ -n "$CDDBID" ]; then echo "There is a CD in the drive. Ejecting it" eject /dev/hdc #Buglet: we don't necessarily want to eject the disk; we just want to be sure it has stopped playing. fi #We're now OK to proceed. if /sbin/lsmod | grep lt_hotswap > /dev/null ; then echo "We are using lt_hotswap" #Eject the bay using lths. echo -n "MSTR eject" > /proc/acpi/lths else echo "We are not using lt_hotswap. Do it the old way with idectl." #Unregister IDE interface 1. This WILL cause a kernel panic if there is anything in the drive! idectl 1 off #Tell the thinkpad the bay is to be ejected echo eject > /proc/acpi/ibm/bay fi #Beep happily echo 6 > /proc/acpi/ibm/beep echo "OK to undock"
This script is called on insertion. It is /etc/acpi/actions/ultrabase_insert.sh
#!/bin/bash echo "Ultrabase has been inserted. Re-registering IDE interface for CDROM." if /sbin/lsmod | grep lt_hotswap > /dev/null ; then echo "We are using lt_hotswap" echo "Enabling DMA on /dev/hdc" hdparm -d 1 -u 1 -c 1 /dev/hdc #LTHS already beeps; no beep required here. else echo "We are not using lt_hotswap. Do it the old way with idectl." #Register IDE interface 1 idectl 1 rescan #Turn DMA on again. But this is probably a vain attempt; it will fail unless we are using lt_hotswap. sleep 2 hdparm -d1 /dev/hdc || echo "WARNING: DMA cannot be re-enabled for hdc after insert. You'll have to reboot for now." #Beep happily echo 6 > /proc/acpi/ibm/beep fi echo "Redocked successfully" echo "Note: KDE's volume manager might not work anymore with the CD/DVD drive."
- The easiest way to check what is happening is:
tail -f /var/log/acpid
- Remember, after modifying anything in /etc/acpi/events, to reload the acpid rules:
killall -HUP acpid
- Note that stdout from all scripts ends up in /var/log/acpid. But to communicate a message with the user, it's best to use either the various thinkpad beeps, or perhaps the thinklight.
- Note: idectl and lt_hotswap really don't get along together. You will lock the system.
- Save your files; this could (possibly) crash the kernel.
- Press the "Request ejection" button, which is on the front of the ultrabase (located between CD drive and floppy).
- The thinkpad should beep happily (high-low). If so, proceed. Otherwise, if it beeps unhappily (3 very short high beeps), it was unable to unmount a busy filesystem in the optical drive.
Note: If you change your mind after the thinkpad has beeped happily, you should eject the laptop, and then re-insert.
- Gently pull the release handles (back left/right of the ultrabase). If it beeps unhappily (long, high), stop pulling.
- Pull the handles harder to physically eject the thinkpad.
- Later, reseat the thinkpad with a firm push.
Note: If you change your mind after the thinkpad has beeped happily at (2), you should eject the laptop, and then re-insert.