ThinkWiki - User contributions [en]

TuxOnIce

2006-07-10T18:15:41Z

ThomasRies: /* Model-specific Status */

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|style="vertical-align:top;padding-right:20px;width:10px;white-space:nowrap;" | __TOC__
|style="vertical-align:top" |
===Software Suspend 2 - swsusp2===
Software Suspend 2, sometimes also called "swsusp2" and "suspend2", is an implementation of suspend-to-disk functionality in the form of a Linux kernel patch and several userspace utilities. It is an alternative to both the BIOS-driven hibernation feature found on most ThinkPad models, and the [[swsusp]] "software suspend" functionality built into recent Linux kernels.
|}

==Features==
Compared to the alternatives, Software Suspend 2 has some unique [http://suspend2.net/features features]:
* The ability to compress the memory image as it is written to disk, thereby reducing suspend and resume times.
* Saving the memory image into a swap file, a swap partition or normal a file on any filesystem.
* Cancelling a suspend in progress
* Control over amount of RAM written to disk -- can (optionally) discard cached disk blocks to reduce suspend and resume times
* Textual and graphical UI (optional)
* Improved reliability under some circumstances -- if the alternatives don't work, try this one!

Since it is implemented purely in software, Software Suspend 2 is in principle machine-independent and should work on all modern ThinkPad models. However, in some cases problematic drivers need to be unloaded before suspension. This is handled by the <tt>hibernate</tt> script (see below).

==Availability / Project Homepage==
* [http://suspend2.net/ Project home page]

==Model-specific Status==
* ThinkPad {{T43}} and {{T42}}: works
* ThinkPad {{T21}}: works; need to unload the sound module (<tt>snd-cs46xx</tt>) on suspend. May want to enable UseDummyXServer if running X.
* ThinkPad {{X41T}}: works; requires SATA resume patch and the SATA drivers compiled as built-in or in initrd (see [[Problems with SATA and Linux]]) and a {{path|hibernate.conf}} fix (see [[Installing Fedora Core 4 on a ThinkPad X41 Tablet]])
* ThinkPad {{X22}}: works (see [[Installing Ubuntu (Breezy) on a ThinkPad X22]])
* ThinkPad {{G41}}: works (see [[Installing Debian on a ThinkPad G41]])
* ThinkPad {{R52}}: works (requires SWSusp version >= 2.2.7. FC5 with kernel [http://mhensler.de/swsusp/download_en.php 2.6.17-1.2145_1.rhfc5.cubbi_suspend2])

==Installation Instructions==
The [http://suspend2.net/ project home page] has a detailed HOWTO and FAQ. The following are just a few highlights.

===Patching mkinitrd===
If your systems uses an <tt>initrd</tt> file (most do), you'll need to patch or replace your <tt>initrd</tt>-creation script.

*{{Fedora}} 4: in {{path|/sbin/mkinitrd}}, find this line:
echo "echo Mounted /proc filesystem" >> $RCFILE
and add the following immediately afterwards:
echo "echo > /proc/suspend2/do_resume" >>$RCFILE
*{{Fedora}} 5: in {{path|/sbin/mkinitrd}}, find this line:
mount -t proc /proc /proc
and add the following immediately afterwards:
echo > /proc/suspend2/do_resume
*{{Debian}}: copy [http://dagobah.ucc.asn.au/swsusp/2.0.0.102/swsusp-initrd.sh swsusp-initrd.sh] script to your {{path|/etc/mkinitrd/scripts}} directory before creating initrd image.

Make sure you regenerate your <tt>initrd</tt> file (using <tt>mkinitrd</tt> or by reinstalling the kernel) after patching <tt>mkinitrd</tt>.

===Hibernate script===
Software Suspend 2 works best with the <tt>hibernate</tt> script (available from the project home page), which takes care of auxiliary tasks needed on many systems (e.g., unloading problematic modules and restoring video modes).

====Availability====
*{{Gentoo}}: emerge hibernate-script
*{{Fedora}}: kernel and hibernate RPMs are available at http://mhensler.de/swsusp/
*{{Ubuntu}}: packages for Ubuntu Dapper Drake (kernel, hibernate, suspend2ui-userui): http://dagobah.ucc.asn.au/dapper-kernels/
*PLD: poldek -iv hibernate
*Other: check the home page for packages (deb, i386 rpm, tgz, and source rpm) from http://www.suspend2.net

==Configuration tips==
===RediSafe-like functionality===
The hibernate functionality on some ThinkPad BIOSes offers the useful "RediSafe" feature, which suspends to both RAM and disk. This way you get quick resumes (directly from RAM), plus the safey of suspend-to-disk in case the battery runs out.

Software Suspend 2 provides this feature too; simply add the following to {{path|/etc/hibernate/hibernate.conf}}:
PowerdownMethod 3

[[Category:Patches]] [[Category:Drivers]]

TuxOnIce

2006-07-10T18:14:50Z

ThomasRies: /* Model-specific Status */

{| width="100%"
|style="vertical-align:top;padding-right:20px;width:10px;white-space:nowrap;" | __TOC__
|style="vertical-align:top" |
===Software Suspend 2 - swsusp2===
Software Suspend 2, sometimes also called "swsusp2" and "suspend2", is an implementation of suspend-to-disk functionality in the form of a Linux kernel patch and several userspace utilities. It is an alternative to both the BIOS-driven hibernation feature found on most ThinkPad models, and the [[swsusp]] "software suspend" functionality built into recent Linux kernels.
|}

==Features==
Compared to the alternatives, Software Suspend 2 has some unique [http://suspend2.net/features features]:
* The ability to compress the memory image as it is written to disk, thereby reducing suspend and resume times.
* Saving the memory image into a swap file, a swap partition or normal a file on any filesystem.
* Cancelling a suspend in progress
* Control over amount of RAM written to disk -- can (optionally) discard cached disk blocks to reduce suspend and resume times
* Textual and graphical UI (optional)
* Improved reliability under some circumstances -- if the alternatives don't work, try this one!

Since it is implemented purely in software, Software Suspend 2 is in principle machine-independent and should work on all modern ThinkPad models. However, in some cases problematic drivers need to be unloaded before suspension. This is handled by the <tt>hibernate</tt> script (see below).

==Availability / Project Homepage==
* [http://suspend2.net/ Project home page]

==Model-specific Status==
* ThinkPad {{T43}} and {{T42}}: works
* ThinkPad {{T21}}: works; need to unload the sound module (<tt>snd-cs46xx</tt>) on suspend. May want to enable UseDummyXServer if running X.
* ThinkPad {{X41T}}: works; requires SATA resume patch and the SATA drivers compiled as built-in or in initrd (see [[Problems with SATA and Linux]]) and a {{path|hibernate.conf}} fix (see [[Installing Fedora Core 4 on a ThinkPad X41 Tablet]])
* ThinkPad {{X22}}: works (see [[Installing Ubuntu (Breezy) on a ThinkPad X22]])
* ThinkPad {{G41}}: works (see [[Installing Debian on a ThinkPad G41]])
* ThinkPad {{R52}}: works (requires SWSusp version >= 2.2.7. FC5 with kernel [http://http://mhensler.de/swsusp/download_en.php 2.6.17-1.2145_1.rhfc5.cubbi_suspend2])

==Installation Instructions==
The [http://suspend2.net/ project home page] has a detailed HOWTO and FAQ. The following are just a few highlights.

===Patching mkinitrd===
If your systems uses an <tt>initrd</tt> file (most do), you'll need to patch or replace your <tt>initrd</tt>-creation script.

*{{Fedora}} 4: in {{path|/sbin/mkinitrd}}, find this line:
echo "echo Mounted /proc filesystem" >> $RCFILE
and add the following immediately afterwards:
echo "echo > /proc/suspend2/do_resume" >>$RCFILE
*{{Fedora}} 5: in {{path|/sbin/mkinitrd}}, find this line:
mount -t proc /proc /proc
and add the following immediately afterwards:
echo > /proc/suspend2/do_resume
*{{Debian}}: copy [http://dagobah.ucc.asn.au/swsusp/2.0.0.102/swsusp-initrd.sh swsusp-initrd.sh] script to your {{path|/etc/mkinitrd/scripts}} directory before creating initrd image.

Make sure you regenerate your <tt>initrd</tt> file (using <tt>mkinitrd</tt> or by reinstalling the kernel) after patching <tt>mkinitrd</tt>.

===Hibernate script===
Software Suspend 2 works best with the <tt>hibernate</tt> script (available from the project home page), which takes care of auxiliary tasks needed on many systems (e.g., unloading problematic modules and restoring video modes).

====Availability====
*{{Gentoo}}: emerge hibernate-script
*{{Fedora}}: kernel and hibernate RPMs are available at http://mhensler.de/swsusp/
*{{Ubuntu}}: packages for Ubuntu Dapper Drake (kernel, hibernate, suspend2ui-userui): http://dagobah.ucc.asn.au/dapper-kernels/
*PLD: poldek -iv hibernate
*Other: check the home page for packages (deb, i386 rpm, tgz, and source rpm) from http://www.suspend2.net

==Configuration tips==
===RediSafe-like functionality===
The hibernate functionality on some ThinkPad BIOSes offers the useful "RediSafe" feature, which suspends to both RAM and disk. This way you get quick resumes (directly from RAM), plus the safey of suspend-to-disk in case the battery runs out.

Software Suspend 2 provides this feature too; simply add the following to {{path|/etc/hibernate/hibernate.conf}}:
PowerdownMethod 3

[[Category:Patches]] [[Category:Drivers]]