Can't resume ThinkPad from suspend

[Suvayu Ali]

Hi,

I have a new ThinkPad (x240) running 3.12.8-300.fc20.x86_64.  I can
suspend it just fine, but I can't resume.  This is what I see in the
journal:

Jan 27 03:49:05 localhost systemd[1]: Starting Sleep.
-- Subject: Unit sleep.target has begun with start-up
-- Defined-By: systemd
-- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
--
-- Unit sleep.target has begun starting up.
Jan 27 03:49:05 localhost systemd[1]: Reached target Sleep.
-- Subject: Unit sleep.target has finished start-up
-- Defined-By: systemd
-- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
--
-- Unit sleep.target has finished starting up.
--
-- The start-up result is done.
Jan 27 03:49:05 localhost systemd[1]: Starting Suspend...
-- Subject: Unit systemd-suspend.service has begun with start-up
-- Defined-By: systemd
-- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
--
-- Unit systemd-suspend.service has begun starting up.
Jan 27 03:49:05 localhost systemd[1]: Starting Network Manager Script Dispatcher Service...
-- Subject: Unit NetworkManager-dispatcher.service has begun with start-up
-- Defined-By: systemd
-- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
--
-- Unit NetworkManager-dispatcher.service has begun starting up.
Jan 27 03:49:05 localhost dbus-daemon[574]: dbus[574]: [system] Successfully activated service 'org.freedesktop.nm_dispatcher'
Jan 27 03:49:05 localhost dbus[574]: [system] Successfully activated service 'org.freedesktop.nm_dispatcher'
Jan 27 03:49:05 localhost systemd-sleep[29852]: Suspending system...
-- Subject: System sleep state suspend entered
-- Defined-By: systemd
-- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
--
-- The system has now entered the suspend sleep state.

After this, I can't see anything when I tried to wake up my laptop.  The
next thing I see is when I had to force a reboot.

-- Reboot --
Jan 27 11:51:44 localhost systemd-journal[93]: Runtime journal is using 8.0M (max 383.8M, leaving 575.8M of free 3.7G, current limit 383.8M).
Jan 27 11:51:44 localhost systemd-journal[93]: Runtime journal is using 8.0M (max 383.8M, leaving 575.8M of free 3.7G, current limit 383.8M).
Jan 27 11:51:44 localhost kernel: Initializing cgroup subsys cpuset
Jan 27 11:51:44 localhost kernel: Initializing cgroup subsys cpu
Jan 27 11:51:44 localhost kernel: Initializing cgroup subsys cpuacct

... and so on.

How do I debug this?  How can I get more information why the resume
fails?  Thanks for any ideas.

Cheers,

-- 
Suvayu

Open source is the future. It sets us free.