In comment #2 I wrote:
> Comment on attachment 68712 [details] [review]
>...
> Although you could make the penultimate line as follows I don't recommend it
> because it would hide any problems like the escaping issue that could cause
> HIBERNATE_MODE_SAVE to be invalid:
>
> [ -n "$HIBERNATE_MODE_SAVE" ] && echo -n "$HIBERNATE_MODE_SAVE"
> >
> /sys/power/disk
In fact there are 2 cases as the code is used now:
1 HIBERNATE_MODE unset => normal hibernate
2 HIBERNATE_MODE = suspend => suspend-hybrid
Given which, I've revised my comment above and propose a new version of
the modified do_hibernate() as follows:
do_hibernate()
{
local hibernate_mode_save ret
[ -n "${HIBERNATE_MODE}" ] && \
grep -qw "${HIBERNATE_MODE}" /sys/power/disk && \
hibernate_mode_save=$(cat /sys/power/disk) && \
hibernate_mode_save="${hibernate_mode_save##*\[}" && \
hibernate_mode_save="${hibernate_mode_save%%\]*}" && \
[ "$hibernate_mode_save" != "${HIBERNATE_MODE}" ] || \
hibernate_mode_save=""
[ -n "$hibernate_mode_save" ] && \
echo -n "${HIBERNATE_MODE}" > /sys/power/disk
echo -n "disk" > /sys/power/state
ret=$?
[ -n "$hibernate_mode_save" ] && \
echo -n "$hibernate_mode_save" > /sys/power/disk
return $ret
}
The key points:
- hibernate_mode_save is only set if the current HIBERNATE_MODE is being
changed (which only happens, if it does, in the suspend-hybrid case);
- on resume the hibernate mode is only restored if hibernate_mode_save was set.
This fixes:
- the failure to restore the hibernate mode with suspend-hybrid;
- "sh: I/O error" on resume from suspend-hybrid
- "sh: I/O error" on resume from hibernate.
Finally, the pm_functions script uses "echo -n" (from line 318,
including the above patch) and local declarations while the comment
against function log() implies that the script is aiming for POSIX
conformance and yet other functions use non-POSIX local declarations.
local and "echo -n" usages are fine for Debian and derived environments.
To achieve POSIX conformance such usages would have to be reviewed and
modified; "echo -n" could be replaced with printf (the parameters to be
echoed in each case being plain text not containing formatting
commands); or a shell function echo() can be added based on log().
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You received this bug notification because you are a member of Desktop
Packages, which is subscribed to pm-utils in Ubuntu.
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:
Confirmed
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:
Unknown
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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