Xscreensaver + systemctl suspend Perl script for power management in LXDE not working

Xenphor · 09-24-2013, 05:54 PM

I have Fedora 19 lxde and it does not come with any power management utilities. I tried downloading the xfce power manager but none of the changes I made had any effect, so now I'm trying to use Xscreensaver in conjunction with a Perl script I stole (never used perl) on the Xscreensaver website http://www.jwz.org/xscreensaver/man3.html to issue a standby command with systemctl:

Code:

#!/usr/bin/perl

my $blanked = 0;
open (IN, "xscreensaver-command -watch |");
while (<IN>) {
	if (m/^(BLANK|LOCK)/) {
                if (!$blanked) {
                        system "systemctl suspend";
                        $blanked = 1;
        }
}}

I run this script in the background and it actually works the first time the screensaver is triggered; however, after resuming from suspend, even though the script still appears to be running, it will no longer trigger in the future. How can I get it to reinitialize?

kbp · 09-24-2013, 09:52 PM

It seems you would want to make a daemon in perl, there is plenty of example code out there .. but my first suggestion would be to work out why xfce power manager isn't working, I run Fed19 with LXDE and I don't have any issues with it. Are there any messages in the logs related to ACPI ?

Xenphor · 09-27-2013, 10:49 PM

I have this:

Code:

$ dmesg | grep acpi
[    0.000000] ACPI: LAPIC (acpi_id[0x01] lapic_id[0x00] enabled)
[    0.000000] ACPI: LAPIC (acpi_id[0x02] lapic_id[0x02] enabled)
[    0.000000] ACPI: LAPIC (acpi_id[0x03] lapic_id[0x04] enabled)
[    0.000000] ACPI: LAPIC (acpi_id[0x04] lapic_id[0x06] enabled)
[    0.000000] ACPI: LAPIC_NMI (acpi_id[0xff] high edge lint[0x1])
[    0.149495] acpiphp: ACPI Hot Plug PCI Controller Driver version: 0.5
[    0.203258] acpi PNP0A08:00: Requesting ACPI _OSC control (0x1d)
[    0.203639] acpi PNP0A08:00: ACPI _OSC control (0x18) granted
[    0.211578] acpi root: \_SB_.PCI0 notify handler is installed
[    0.211614] Found 1 acpi root devices
[    0.395898] ACPI: Requesting acpi_cpufreq
[    0.572571] acpi device:50: hash matches

kbp · 09-28-2013, 07:03 PM

Ok, so it looks like acpi support is present .. exactly which setting wasn't working in your power manager preferences ?

Xenphor · 09-28-2013, 08:15 PM

I'm trying to get the computer to suspend after a certain amount of time elapsed, on AC. So I guess it's under the "Actions" tab under "AC".

kbp · 09-29-2013, 01:30 AM

So "Put the computer to sleep when inactive for" .. could you try setting it to something low - say 5 minutes, and then watch it and see what happens?

Xenphor · 09-29-2013, 08:45 PM

Ok well it worked one time after booting but it doesn't do it again. When I first launch xfce4 power settings it says that the power manager isn't running and asks to start it. Is the service not running in the background correctly or something?

kbp · 09-29-2013, 09:17 PM

Is Power Manager checked in "Desktop Session Settings" > Automatically Started Applications ?

Xenphor · 09-29-2013, 10:28 PM

No it wasn't.

However I noticed that the second time it tried to suspend, my computer locked up completely and I had to restart.

kbp · 09-29-2013, 10:41 PM

That may not be related to Power Manager though .. how about after a cold boot with Power Manager starting automatically? Is it suspending ok?

Xenphor · 09-30-2013, 12:19 AM

Well it did succeed a second time now.

kbp · 09-30-2013, 12:25 AM

Cool .. let us know if the lockup comes back

Xenphor · 09-30-2013, 12:12 PM

Well actually I do have another problem, although it is unrelated to power management.

I don't suppose you have experience with bluetooth on LXDE Fedora? I installed quite a few of the bluetooth packages recently (bluez, blueman, gnome-bluetooth) and I can't get any of them to work. The GUI utilities don't execute because of some errors in python (?) I think according to the console and I'm not sure how to use any CLI utilities if there are any.

My asus bluetooth radio is detected by the hci tool so I don't think it's a problem with that.

I just need a straight forward utility to pair my device (controller).

kbp · 10-01-2013, 03:30 AM

Might be better to start a new question so any bluetooth gurus might see it .. personally I rarely use bluetooth but when I did I had no problems, maybe check /var/log/messages and add any results into the new question

cheers