Bug#749330: systemd: The sysctl service is not started correctly at boot

[Patrick Häcker]

>>> vm.dirty_writeback_centisecs = 1500
>> which is used as an example to describe the bug in the following.
>> 
>> After boot,
>>> cat /proc/sys/vm/dirty_writeback_centisecs
>> returns
>> 500,
> 
> Do you use any power management tools, like acpi-support,
> laptop-mode-tools or pm-utils? If so, one of those might be setting that
> value on ac/battery changes.
acpi-support and laptop-mode-tools are not installed, but pm-utils is 
installed (version 1.4.1-14). A search through the results of
> grep 500 $(dpkg -S pm-utils | sed 's/^.* //')
does not give any plausible result

> I suspect laptop-mode-tools is the culprit:
> 
> http://sources.debian.net/src/laptop-mode-tools/1.64-1/usr/share/laptop-mode
> -tools/modules/laptop-mode?hl=418#L418
> 
> set_sysctl /proc/sys/vm/dirty_writeback_centisecs   "$U_AGE"
> 
> and
> 
> usr/share/laptop-mode-tools/modules/laptop-mode:	
U_AGE=$((100*$DEF_UPDATE))
> usr/sbin/laptop_mode:DEF_UPDATE=5
> 
> → there you have your 500
Thanks for your investigation, but as mentioned: laptop-mode-tools is not 
installed.

I guess the value dirty_writeback_centisecs defaults to 500. Other values 
defined via sysctl have their (suspected) default value, too, after boot and 
only change to the desired value after restarting the service manually as 
described. Thus, I guess that the sysctl service is not started correctly, 
although I cannot explain why systemctl should state otherwise (active, 
success) in this case.
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