Arch às vezes não suspende

Question

Às vezes, o computador não é suspenso automaticamente quando a tampa é fechada. Quando isso acontece, o fechamento da tampa não a fará suspender até a próxima reinicialização. Após a reinicialização, a suspensão automática funciona novamente. Depois de um tempo, ele pára de funcionar novamente, não consegui determinar o que muda o estado de suspenso para inesgotável.

No estado não suspenso "sudo pm-suspend" e "sudo systemctl suspend" não o faça ficar suspenso.

Estou executando um Lenovo X220 com Arch 64 bits.

O que devo fazer / tentar fazê-lo funcionar como deveria?

EDIT: saída journalctl adicionada:

journalctl -xn

-- Logs begin at Sun 2013-08-25 11:05:23 CEST, end at Tue 2014-03-04 20:32:31 CET. --
Mar 04 20:32:06 x220 systemd[1]: systemd-suspend.service: main process exited, code=exited, status=1/FAILURE
Mar 04 20:32:06 x220 systemd[1]: Failed to start Suspend.
-- Subject: Unit systemd-suspend.service has failed
-- Defined-By: systemd
-- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
-- Documentation: http://www.freedesktop.org/wiki/Software/systemd/catalog/be02cf6855d2428ba40df7e9d022f03d
-- 
-- Unit systemd-suspend.service has failed.
-- 
-- The result is failed.
Mar 04 20:32:06 x220 systemd[1]: Dependency failed for Suspend.
-- Subject: Unit suspend.target has failed
-- Defined-By: systemd
-- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
-- Documentation: http://www.freedesktop.org/wiki/Software/systemd/catalog/be02cf6855d2428ba40df7e9d022f03d
-- 
-- Unit suspend.target has failed.
-- 
-- The result is dependency.
Mar 04 20:32:06 x220 systemd[1]: Service sleep.target is not needed anymore. Stopping.
Mar 04 20:32:06 x220 systemd[1]: Unit systemd-suspend.service entered failed state.
Mar 04 20:32:06 x220 systemd[1]: Stopping Sleep.
-- Subject: Unit sleep.target has begun shutting down
-- Defined-By: systemd
-- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
-- 
-- Unit sleep.target has begun shutting down.
Mar 04 20:32:06 x220 systemd[1]: Stopped target Sleep.
-- Subject: Unit sleep.target has finished shutting down
-- Defined-By: systemd
-- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
-- Documentation: http://www.freedesktop.org/wiki/Software/systemd/catalog/9d1aaa27d60140bd96365438aad20286
-- 
-- Unit sleep.target has finished shutting down.
Mar 04 20:32:06 x220 sudo[21989]: pam_unix(sudo:session): session closed for user root
Mar 04 20:32:06 x220 kernel: video LNXVIDEO:00: Restoring backlight state

    

Answer 1

O meu suspenderia, mas seria retomado imediatamente. A solução para mim foi desativar ( d ) Wake-on-LAN:

$ sudo ethtool -s eno1 wol d
$ sudo ethtool eno1 | grep Wake-on
    Supports Wake-on: pumbg
    Wake-on: d