** Description changed:

  From kernel-3.6 there is in-kernel support for suspend to both (AKA
  hybrid suspend). Working patches can be found at
  https://bugs.freedesktop.org/show_bug.cgi?id=52572 (or links).
+ 
+ 
+ [Impact] 
+ 
+  * Ubuntu 12.04 implements hybrid suspend differently. It suspends first and 
wakes up
+    the computer for hibernation 15 minutes later. This is risky since the 
computer may be
+    carried when the wakeup happens. The hard disk may experience physical 
shocks and get
+    damaged.
+ 
+  * Thus, it is desirable to have a real hybrid suspend implementation. 
In-kernel hybrid
+    suspend has been supported since kernel 3.6+. pm-utils only needs a small 
patch to
+    enable this feature. 
+ 
+ 
+ [Test Case]
+ 
+  * Ensure all Ubuntu 12.04 packages are up-to-date in the test environment.
+    Install pm-utils 1.4.1-9ubuntu1
+    Install linux-image-lts-raring
+ 
+  * Reboot the computer with lts-raring kernel. Run the command: 
'pm-suspend-hybrid' from a 
+    terminal. After the computer suspends, press the power button. It should 
be able to
+    resume from suspension correctly. 
+ 
+  * Run the command above again. After it suspends, remove and reconnect its 
power supply 
+    (or its battery). Press the power button. It should be able to resume from 
hibernation
+    correctly.
+ 
+  * Reboot with the default 3.2 kernel, Run the command above. 
+    The computer should be able to suspend and then wake up for hibernation 15 
minutes
+    later.
+ 
+ 
+ [Regression Potential] 
+ 
+  * This patch won't affect users who still use 3.2 kernel. It only enables 
in-kernel
+    hybrid suspend if the option 'suspend' is available from /sys/power/disk.

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https://bugs.launchpad.net/bugs/1172692

Title:
  Please implement in-kernel suspend to both

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