[Bug 1548392]

[Dirk F]

Created attachment 122010
patch based on review of patch 68712, taken from running pm-functions

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Title:
  Fix for 1172692 fails to restore hibernation mode with suspend-hybrid

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[Bug 1548486] Re: Sleep hook in a subdirectory ignored but causes double execution of previous hook

[Dirk F]

Upstream bug with patch at


** Bug watch added: freedesktop.org Bugzilla #94323
   https://bugs.freedesktop.org/show_bug.cgi?id=94323

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Title:
  Sleep hook in a subdirectory ignored but causes double execution of
  previous hook

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[Bug 1172692]

[Dirk F]

In comment #3 I wrote:
>...
> Finally, the pm_functions script uses "echo -n" (from line 318, including
> the above patch) ...

See also bug 91497.

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Title:
  Please implement in-kernel suspend to both

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[Bug 1172692]

[Dirk F]

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:

1HIBERNATE_MODE unset => normal hibernate

2HIBERNATE_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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Title:
  Please implement in-kernel suspend to both

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[Bug 1172692]

[Dirk F]

Comment on attachment 68712
Improved patch to save previous hibernation method

Review of attachment 68712:
-

In do_hibernate() the attempt to save and restore the active mode in
/sys/power/disk fails, causing "sh: I/O error" message in pm log
(attempting to write something that isn't one of the modes in
/sys/power/disk, namely an empty string). Instrumenting the function I
found that HIBERNATE_MODE_SAVE was never set.

The characters [] are special in a shell pattern (which is what follows
the ## and %% shell variable expansion modifiers) and have to be
escaped: \[ \].

The following works as you intended:

do_hibernate()
{
[ -n "${HIBERNATE_MODE}" ] && \
grep -qw "${HIBERNATE_MODE}" /sys/power/disk && \
#df 2016-02-07 Shell patterns have to be escaped \[ \]! Fixes 
sh: I/O error when -z $HIBERNATE_MODE_SAVE 
HIBERNATE_MODE_SAVE=$(cat /sys/power/disk) && \
HIBERNATE_MODE_SAVE="${HIBERNATE_MODE_SAVE##*\[}" && \
HIBERNATE_MODE_SAVE="${HIBERNATE_MODE_SAVE%%\]*}" && \
echo -n "${HIBERNATE_MODE}" > /sys/power/disk
echo -n "disk" > /sys/power/state
RET=$?
echo -n "$HIBERNATE_MODE_SAVE" > /sys/power/disk
return "$RET"
}

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

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Title:
  Please implement in-kernel suspend to both

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[Bug 1548853] [NEW] 00powersave sleep hook misses claimed patch

[Dirk F]

Public bug reported:

The pm-utils sleep hook installed at /usr/lib/pm-
utils/sleep.d/00powersave was supposed to have been patched to prevent
it running on ARM architectures. However a new case was added without
deleting the preceding existing one (lines 12 on):

case $1 in
suspend|hibernate) pm-powersave false ;;
suspend|hibernate) [ "$ARCH" != "${ARCH#arm}" ] || pm-powersave false ;;
resume|thaw)   pm-powersave ;;
*) exit $NA ;;
esac

Observed in and affects 14.04.3,4.; seems to be OK in 14.10-15.10.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: pm-utils 1.4.1-13ubuntu0.2 [modified: usr/lib/pm-utils/pm-functions]
ProcVersionSignature: Ubuntu 4.2.0-29.34~14.04.1-generic 4.2.8-ckt3
Uname: Linux 4.2.0-29-generic i686
ApportVersion: 2.14.1-0ubuntu3.19
Architecture: i386
Date: Tue Feb 23 13:51:14 2016
InstallationDate: Installed on 2016-02-21 (1 days ago)
InstallationMedia: Lubuntu 14.04.4 LTS "Trusty Tahr" - Release i386 (20160217.1)
PackageArchitecture: all
SourcePackage: pm-utils
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: pm-utils (Ubuntu)
 Importance: Undecided
 Status: New


** Tags: apport-bug i386 package-from-proposed trusty

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Title:
  00powersave sleep hook misses claimed patch

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[Bug 1443249] Re: After kernel-3.13.0-41, wireless script checks wrong sys file.

[Dirk F]

*** This bug is a duplicate of bug 1544612 ***
https://bugs.launchpad.net/bugs/1544612

** This bug is no longer a duplicate of bug 1414110
   Wireless powersave doesn't work (pm-utils)
** This bug has been marked a duplicate of bug 1544612
   Missing fix for 1299975 claimed to be in pm-utils (1.4.1-13ubuntu0.1)

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Title:
  After kernel-3.13.0-41, wireless script checks wrong sys file.

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[Bug 1414110] Re: Wireless powersave doesn't work (pm-utils)

[Dirk F]

*** This bug is a duplicate of bug 1544612 ***
https://bugs.launchpad.net/bugs/1544612

Should be fixed along with bug 1544612. Marking as duplicate...

** This bug has been marked a duplicate of bug 1544612
   Missing fix for 1299975 claimed to be in pm-utils (1.4.1-13ubuntu0.1)

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Title:
  Wireless powersave doesn't work (pm-utils)

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[Bug 1548486] [NEW] Sleep hook in a subdirectory ignored but causes double execution of previous hook

[Dirk F]

Public bug reported:

The set of sleep hooks provided in /usr/lib/pm-utils/sleep.d includes
one (95packagekit/95packagekit) that is stored in a subdirectory. This
has two effects:

1the hook is not run;

2the previous hook, currently /usr/lib/pm-utils/sleep.d/95led, is
run for a second time instead.

Presumably #1 is wrong, and results from an installation fault in
packagekit,  separately reported as bug 1548480.

#2 occurs because the function run_hooks() in /usr/lib/pm-utils/pm-
functions computes a list of to-be-executed hooks that includes
directories but neither fully validates each such hook as a regular file
nor handles a set of to-be-executed hooks in a subdirectory.

At lines 243 on, there is  a code path with no else clause through which
the $hook from the previous iteration can be accidentally reused:

if [ -f "$syshooks/$base" ]; then
hook="$syshooks/$base"
elif [ -f "$phooks/$base" ]; then
hook="$phooks/$base"
fi

An easy fix is to insert the missing else clause before the fi line so
that the script skips the subdirectory or other non-regular file and
carries on with the next correctly specified hook:

if [ -f "$syshooks/$base" ]; then
hook="$syshooks/$base"
elif [ -f "$phooks/$base" ]; then
hook="$phooks/$base"
else 
continue
fi

Observed in Lubuntu 14.04.3,4 with pm-utils 1.4.1-13ubuntu0.1,2. However
the relevant pm-utils code dates back to 2008, pm-utils upstream version
1.1.0.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: pm-utils 1.4.1-13ubuntu0.2 [modified: usr/lib/pm-utils/pm-functions]
ProcVersionSignature: Ubuntu 4.2.0-29.34~14.04.1-generic 4.2.8-ckt3
Uname: Linux 4.2.0-29-generic i686
ApportVersion: 2.14.1-0ubuntu3.19
Architecture: i386
Date: Mon Feb 22 17:10:53 2016
InstallationDate: Installed on 2016-02-21 (0 days ago)
InstallationMedia: Lubuntu 14.04.4 LTS "Trusty Tahr" - Release i386 (20160217.1)
PackageArchitecture: all
SourcePackage: pm-utils
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: pm-utils (Ubuntu)
 Importance: Undecided
 Status: New


** Tags: apport-bug i386 package-from-proposed trusty

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Title:
  Sleep hook in a subdirectory ignored but causes double execution of
  previous hook

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[Bug 1548392] [NEW] Fix for 1172692 fails to restore hibernation mode with suspend-hybrid

[Dirk F]

Public bug reported:

The patch provided in upstream bug
 and implemented
through 28-suspend-hybrid.patch causes error messages "sh: I/O error"
when resuming with suspend-hybrid and hibernate kernel methods.

With suspend-hybrid it also forces the hibernation mode, as shown in
/sys/power/disk, to "suspend" instead of restoring the original mode
which is what the patch tried to do.

Please see the upstream bug for a review of the provided patch with
proposed fixes.

Affects all Ubuntu and derived versions with pm-utils
1.4.1-9fix.ubuntu12.10 or later.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: pm-utils 1.4.1-13ubuntu0.2 [modified: usr/lib/pm-utils/pm-functions]
ProcVersionSignature: Ubuntu 4.2.0-29.34~14.04.1-generic 4.2.8-ckt3
Uname: Linux 4.2.0-29-generic i686
ApportVersion: 2.14.1-0ubuntu3.19
Architecture: i386
Date: Mon Feb 22 16:44:52 2016
InstallationDate: Installed on 2016-02-21 (0 days ago)
InstallationMedia: Lubuntu 14.04.4 LTS "Trusty Tahr" - Release i386 (20160217.1)
PackageArchitecture: all
SourcePackage: pm-utils
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: pm-utils (Ubuntu)
 Importance: Undecided
 Status: New


** Tags: apport-bug i386 package-from-proposed regression-update trusty

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Title:
  Fix for 1172692 fails to restore hibernation mode with suspend-hybrid

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[Bug 1544612] Re: Missing fix for 1299975 claimed to be in pm-utils (1.4.1-13ubuntu0.1)

[Dirk F]

Confirmed fix with 1.4.1-13ubuntu0.2, other details per original report.

** Tags removed: verification-needed
** Tags added: verification-done

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Title:
  Missing fix for 1299975 claimed to be in pm-utils (1.4.1-13ubuntu0.1)

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[Bug 1544612] Re: Missing fix for 1299975 claimed to be in pm-utils (1.4.1-13ubuntu0.1)

[Dirk F]

Thanks, Martin.

But, the absence of the enable[d] file is apparently a legitimate case,
and your patch as it stands causes an undesirable error message in the
PM log in that case, such as:

cat: /sys/class/net/wlan0/device/enable*: No such file or directory

Hence my original proposed test for the file's existence.

As an alternative you could have $(cat  2>/dev/null) but that would
risk masking a genuine error.

Incidentally, with a fix similar to the one you committed in place, I've
observed that the b43 driver, which gets the default power-save command
(lines 41-2 of wireless script)  currently fails to respect the command,
eg:

# iwconfig wlan0 power on
Error for wireless request "Set Power Management" (8B2C) :
SET failed on device wlan0 ; Operation not supported.

Although the script has special cases for certain Intel drivers and you
could add eg new line 41 before the default case

b43) return1;;

I wouldn't recommend doing so both to avoid complexity (don't want it to
end up like pmutils video quirks) and more importantly in case a future
version of the driver fixes the lack of power-saving support.

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Title:
  Missing fix for 1299975 claimed to be in pm-utils (1.4.1-13ubuntu0.1)

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[Bug 1544612] Re: Missing fix for 1299975 claimed to be in pm-utils (1.4.1-13ubuntu0.1)

[Dirk F]

Actually, this is more tricky than I thought. The validity of the bug
1299975 patch depends on which wireless driver is in use, apparently
reflecting some crufty aspects of sysfs and its driver implementations.

In bug 1299975, on rereading, the reporter (savage) says that with an
Intel wireless device the virtual file presented in
/sys/class/net/$device/device was named "enabled" whereas the script
/usr/lib/pm-utils/power.d/wireless referenced "enable".

Whereas I observe that, if present, the virtual file presented in
/sys/class/net/$device/device is named "enable", just as in the
directory listing in comment #3.

In a Toshiba Tecra 8200 with wlan1 identified as Qualcomm Atheros
ARS212/5213/2414 (driver "ath5k"), it's present as "enable".

In a Dell Inspiron 1721 with wlan0 identified as Broadcom Corporation
BCM4321 (driver "b43-pci-bridge"), it's not present at all in
/sys/class/net/$device/device, but there is a corresponding
/sys/bus/pci/drivers/b43-pci-bridge/:0b:00.0/enable (and writing 0
to this file disables the driver). However the test in the wireless
script assumes that the device is disabled if the
/sys/class/net/$device/device/enable* file doesn't exist, so the script
fails in this case.

Presumably

a) the presence of the /sys/class/net/$device/device/enable* file
depends on whether the ability to disable the device via
/sys/class/net/$device/device is supported by the device+driver
combination,

b) if the file is present its exact name depends on some details of the
driver's sysfs interface and installation procedure, but it is either
"enable" or "enabled" (and both are never present together), and

c) if the file is not present the wireless script should assume the
device is enabled.

If these assumptions are valid, the following might be a better bet for
lines 22-23 of /usr/lib/pm-utils/power.d/wireless:

# Assume device is disabled if enable or enabled file exists containing 0; 
then skip
[ -f /sys/class/net/$1/device/enable* ] && [ "$(cat 
/sys/class/net/$1/device/enable*)" = "0" ] && return 1

Obviously there are multiline options that could be more precise.

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Title:
  Missing fix for 1299975 claimed to be in pm-utils (1.4.1-13ubuntu0.1)

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[Bug 1544612] Re: Missing fix for 1299975 claimed to be in pm-utils (1.4.1-13ubuntu0.1)

[Dirk F]

NB The mod identified in the line from the automated package report  
Package: pm-utils 1.4.1-13ubuntu0.1 [modified: 
usr/lib/pm-utils/pm-functions]
arises from my manually applied fix for 
https://bugs.freedesktop.org/show_bug.cgi?id=52572.

It would be good to get that into the repos too.

** Bug watch added: freedesktop.org Bugzilla #52572
   https://bugs.freedesktop.org/show_bug.cgi?id=52572

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Title:
  Missing fix for 1299975 claimed to be in pm-utils (1.4.1-13ubuntu0.1)

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[Bug 1299975] Re: wireless script checks wrong sys file

[Dirk F]

See regression bug 1544612.

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Title:
  wireless script checks wrong sys file

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[Bug 1544612] [NEW] Missing fix for 1299975 claimed to be in pm-utils (1.4.1-13ubuntu0.1)

[Dirk F]

Public bug reported:

The patch debian/patches/17-fix-wireless-hook.patch for bug 1299975 is
supposed to be applied in pm-utils (1.4.1-13ubuntu0.1) but is not
installed in that version from trusty-updates.

The file /usr/lib/pm-utils/power.d/wireless dated 2014-07-15 16:15 (attached) 
supposedly installed by the updated package still contains line 23
   [ "$(cat /sys/class/net/$1/device/enabled)" = "1" ] || return 1
which should be 
   [ "$(cat /sys/class/net/$1/device/enable)" = "1" ] || return 1

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: pm-utils 1.4.1-13ubuntu0.1 [modified: usr/lib/pm-utils/pm-functions]
ProcVersionSignature: Ubuntu 3.13.0-78.122-generic 3.13.11-ckt33
Uname: Linux 3.13.0-78-generic i686
ApportVersion: 2.14.1-0ubuntu3.19
Architecture: i386
CurrentDesktop: LXDE
Date: Thu Feb 11 15:10:05 2016
InstallationDate: Installed on 2014-07-15 (576 days ago)
InstallationMedia: Lubuntu 14.04 LTS "Trusty Tahr" - Release i386 (20140416.2)
PackageArchitecture: all
SourcePackage: pm-utils
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: pm-utils (Ubuntu)
 Importance: Undecided
 Status: New


** Tags: apport-bug i386 regression-update trusty

** Attachment added: "/usr/lib/pm-utils/power.d/wireless 2014-07-15 16:15"
   https://bugs.launchpad.net/bugs/1544612/+attachment/4569338/+files/wireless

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Title:
  Missing fix for 1299975 claimed to be in pm-utils (1.4.1-13ubuntu0.1)

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