[QtExtended] Proper way to invoke suspend?

[Lorn Potter]

Martin Bernreuther wrote:
> Hello,
> 
> on a Linux system (with ACPI) it is possible to invoke a suspend through
> 
> echo -n mem > /sys/power/state
> 
> (see http://ols.fedoraproject.org/OLS/Reprints-2008/brown-reprint.pdf (chapter 5, 6th page 42);
>  http://www.linux.com/articles/54610, http://acpi.sourceforge.net/documentation/sleep.html,
>  http://www.columbia.edu/~ariel/acpi/acpi_howto.txt (section 23.2),
>  http://www.linux-magazin.de/heft_abo/ausgaben/2004/02/einschlaf_hilfen/(offset)/2 (german),...)
> 
> Qt Extended on the Neo Freerunner
> (http://moko.mwester.net/download/uImage-gta02-g291a9d50_mwester-stable.bin +
>  http://other.lastnetwork.net/OpenMoko/qtextended-4.4.2-gta02-rootfs-release-working-with-SystemRingTones.jffs2)
> seems to be APM based
> (/sys/power/state is also present and `echo mem > /sys/power/state` works)
> and `cat /proc/apm` shows some information.
> Working on a console (if you have one, which is not default for QtExtended), section 12.18.8.1.1
> of http://www.uibk.ac.at/linuxdoc/LDP/LDP/Mobile-Guide/html/mobile-guide-p2c1s8-apm.html
> shows a nice way to keep an eye on the battery state through the command prompt:
> export PS1="\$(cat /proc/apm | awk '{print \$7}') \h:\w\$ "
> Invoking a suspend on a APM based systems can be done with
> 
> apm -s
> 
> I noticed /etc/apm/suspend.d/gsm_suspend, which executes
> echo "1" >/sys/devices/platform/neo1973-pm-gsm.0/flowcontrolled
> Is this also needed for a proper suspend? (It seems to work without that.)
> 
> 
> In contrast to the information about e.g. how to turn on/off LEDs 
> (http://wiki.openmoko.org/wiki/FreeRunner/Buttons_and_LEDs)
> I didn't find this in the OpenMoko Wiki. Maybe because OpenMoko offers the
> "Ompower" Power management daemon:
> 
> http://wiki.openmoko.org/wiki/Ompower
> 
> This service seems not to be available for QtExtended:
> 
> root at om-gta02:~# dbus-send --system --print-reply --dest=org.openmoko.Power / org.openmoko.Power.Core.ListResources
> Error org.freedesktop.DBus.Error.ServiceUnknown: The name org.openmoko.Power was not provided by any .service files
> 
> which is not astonishing since
> "ompower is a suspend handling daemon talking dbus installed by default since Om 2008.8"
> but apparently not by QtExtended (and /usr/share/dbus-1/services/ is empty).
> 
> QtExtended offers (formerly QCop and now Qtopia IPC based) services (http://doc.trolltech.com/qtextended4.4/services.html),
> which include a pre-defined suspend service (http://doc.trolltech.com/qtextended4.4/suspendservice.html)
> (also cmp. /opt/Trolltech/Qtopia/services)
> The qcop command-line tool (http://doc.trolltech.com/qtextended4.4/qcop-tool.html) should also be capable to do the job:
> export LD_LIBRARY_PATH=/opt/Trolltech/Qtopia/lib
> export PATH=/opt/Trolltech/Qtopia/bin:$PATH
> 
> qcop service send Suspend 'suspend()'
> 
> 
> There might be more ways to do a suspend...
> 
> 
> What is the proper way to suspend the Freerunner for QtExtended?
> (Probably the last one. But is there more to be done?)

Proper way is to just let it suspend on it's own.

> 
> The next question will be how to configure the lock icon (padlock.png for finxi)
> on the home screen (the rightmost icon on the bottom) to be connected with the
> suspend command/service... (instead of Screen Lock)

You would have to edit the code and recompile, as this is not how the screen lock currently works.


-- 
Lorn 'ljp' Potter
Software Engineer, Systems Group, Qt Software, Nokia Pty Ltd