** Changed in: pm-utils
Status: Confirmed => Won't Fix
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https://bugs.launchpad.net/bugs/1172692
Title:
Please implement in-kernel suspend to both
Status in OEM Priority Project:
Fix Released
Status in OEM Priority Project precise series:
Fix Released
Status in pm-utils:
Won't Fix
Status in pm-utils package in Ubuntu:
Fix Released
Status in pm-utils source package in Precise:
Fix Released
Status in pm-utils source package in Quantal:
Fix Released
Status in pm-utils source package in Trusty:
Fix Released
Status in pm-utils package in CentOS:
Fix Released
Bug description:
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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