[arch-general] Systemd screen brightness

[Aurko Roy]

On Thu, Aug 16, 2012 at 1:50 AM, Norbert Zeh <nzeh at cs.dal.ca> wrote:

> Aurko Roy [2012.08.15 2040 +0530]:
> > On Wed, Aug 15, 2012 at 4:45 PM, Norbert Zeh <nzeh at cs.dal.ca> wrote:
> >
> > >
> > > You can achieve the same by adding the instructions to write to
> > > /sys/class/backlight/acpi_video0/brightness to an appropriate file in
> > > tmpfiles.d.
> > > Read the section on temporary files in the systemd page on the
> archwiki.
> > >
> > > Cheers,
> > > Norbert
> > >
> > >
> > Thanks for the reference. So something like
> >
> > 'w /sys/class/backlight/acpi_video0/brightness - - - - 0'
> >
> > should do the job, except that /sys/class/backlight/acpi_video0 does not
> > exist since acpi does not seem to be running (I recall reading somewhere
> > that systemd handles most acpi functionality, is that correct?).
>
> My apologies.  I wasn't aware that the particular file you're trying to
> write to
> exists only if acpid is running.  I personally went back to running acpid
> because systemd's handling of ACPI events is too rudimentary for my needs.
>  As
> far as I understand from the manpage, you can only set under which
> conditions it
> should handle Lid/Sleep/Power button events.  If these conditions are met,
> systemd handles these events the way systemd thinks they should be
> handled, and
> there seems to be no room to customize it.  Since I never ever shut down my
> laptop except using "halt" or now "systemctl poweroff", I found it
> convenient to
> set the action for power button events to be to put the machine to sleep,
> as
> this avoids the finger gymnastics required to activate the sleep button.
>  This
> type of customization is possible using acpid but doesn't seem to be
> possible
> using systemd alone.
>
> Cheers,
> Norbert
>

I see. Thanks for the clarification.

-- 
Aurko Roy
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