Lt hotswap - Revision history

Marcmerlin: /* Features */

2007-12-26T23:26:57Z

‎Features

2007-12-26T21:55:49Z

2007-12-26T21:39:38Z

‎Features

2007-12-19T07:01:29Z

‎Limitations

2007-11-08T17:52:25Z

2007-02-05T17:31:20Z

‎Limitations

2007-01-04T01:34:36Z

‎Limitation = kernel must be < 2.6.19

2006-08-01T16:27:36Z

‎Supported models

2006-07-27T11:21:03Z

‎Script to eject the ultrabay

2006-07-27T11:19:53Z

‎Script to eject the ultrabay

@@ Line 6: / Line 6: @@
 |}
 ===Features===
-*enable hotswapping of [[UltraBay]] drives if you have to use the old piix/ide-disk drive instead of ata_piix which supports hotswap natively. On new kernels, you should not bother with piix+ide-disk+lt_hotswap and just use ata_piix.
+*enable hotswapping of [[UltraBay]] drives if you have to use the old piix/ide-disk drive instead of ata_piix which supports hotswap natively. On new kernels, you should not bother with piix+ide-disk+lt_hotswap and just use ata_piix. See the [[How to hotswap UltraBay devices]] page for more detaoils on ata_piix vs iix+ide-disk+lt_hotswap
 *automatic IDE unregistering on [[ibm-acpi]] eject event
 *leaves DMA support intact

@@ Line 3: / Line 3: @@
 |style="vertical-align:top" |
 === lt_hotswap ===
-The <tt>lt_hotswap</tt> kernel module enables hot-swapping of UltraBay disk drives under Linux, with DMA support.
+The <tt>lt_hotswap</tt> kernel module enables hot-swapping of UltraBay disk drives under Linux, with DMA support on machines with an old kernel where you might still be required to use piix+ide-disk. With 2.6.2x or better, you should use the new driver, ata_pixx with native hotswapping support.:
 |}
 ===Features===
-*enable hotswapping of [[UltraBay]] drives if you have to use the old piix/ide-disk drive instead of ata_piix which supports hotswap natively
+*enable hotswapping of [[UltraBay]] drives if you have to use the old piix/ide-disk drive instead of ata_piix which supports hotswap natively. On new kernels, you should not bother with piix+ide-disk+lt_hotswap and just use ata_piix.
 *automatic IDE unregistering on [[ibm-acpi]] eject event
 *leaves DMA support intact

@@ Line 6: / Line 6: @@
 |}
 ===Features===
-*enable hotswapping of [[UltraBay]] drives
+*enable hotswapping of [[UltraBay]] drives if you have to use the old piix/ide-disk drive instead of ata_piix which supports hotswap natively
 *automatic IDE unregistering on [[ibm-acpi]] eject event
 *leaves DMA support intact

@@ Line 15: / Line 15: @@
 * Does '''not''' get on well with idectl. Use one, or the other, or crash.
 * On Kernel >= 2.6.19 "#include <linux/config.h>" in lt_hotswap.c has to be replaced by "#include <linux/autoconf.h>"
 ===Project Homepage / Availability===

@@ Line 41: / Line 41: @@
 So the problem is: How do I check if the device is still in use, either by the kernel or by some other process?
 The trick is to compile "cdrom and ide_cd" as modules. If the unload of ide_cd failes some other process is still using the device.
- #!/bin/sh
+if modprobe -r ide_cd; then
- # disable bay if possible
+  modprobe -r cdrom
- # saves about 500mW
+  echo "MSTR eject" > /proc/acpi/lths
+  modprobe ide-cd
- if modprobe -r ide_cd; then
+  modprobe cdrom
-   modprobe -r cdrom
+else
-   echo "MSTR eject" > /proc/acpi/lths
+  echo ""
-   modprobe ide-cd
+  echo "$(fuser -vm /dev/hdc)"
-   modprobe cdrom
+fi
- else
+</bash>

@@ Line 29: / Line 29: @@
 ===Supported models===
 The driver has been explicitly reported to work on the following models. It should work on many others as well:
-*ThinkPad {{A31p}} (warmswap), {{X22}}, {{T30}}, {{T22}}, {{T23}}, {{T40}}, {{T42}}
+*ThinkPad {{A31p}} (warmswap), {{X22}}, {{X24}}, {{T30}}, {{T22}}, {{T23}}, {{T40}}, {{T42}}
 <tt>lt_hotswap</tt> does '''not''' work well on models that require  the <tt>ata_piix</tt> driver rather than the generic <tt>ide-disk</tt> IDE driver. See [[problems with SATA and Linux]] for a list, and [[How to hotswap UltraBay devices]] for an alternative solution on these models.

@@ Line 35: / Line 35: @@
 At least for a thinkpad T41p with a 2.6.15 kernel I recommend to use version 0.2 of lt_hotswap - the latest version reproducable produces oopses and kernel crashes for me.
-===Script to eject the ultrabay===
+===Script to eject an optical ultrabay drive===
 I configured my system to automatically eject my optical drive in battery mode, because it saves about 500mW which is about 5% when my system is idle.
 But when the drive is in use, issuing an eject will result in a kernel ooops/crash.