[Solved] Gnome Power Manager Fails to Suspend to RAM on Lid

[SDNick484]

EDIT: I spoke to soon. Emerging upower 0.9.9 and rebooting resolved my issue.

I've been using gnome-power-manager to control suspending to RAM on lid close for my laptop (Lenovo T400) for a while, but recently I noticed it was failing to do so. I'm not quite sure the cause, though I do suspect upower to be related. I haven't filed a bug yet in case it's a config issue, and I don't know when the problem started. When I try to run gnome-power-manager manually form the console I see the following:
<<<<<
(gnome-power-manager:4466): libupower-glib-WARNING **: Couldn't enumerate devices: Launch helper exited with unknown return code 127
TI:21:36:20 TH:0x133e0c0 FI:gpm-engine.c FN:gpm_engine_coldplug_idle_cb,834
- failed to get device list: Launch helper exited with unknown return code 127
Traceback:
gnome-power-manager() [0x41a974]
gnome-power-manager() [0x419f58]
/usr/lib64/libglib-2.0.so.0(g_main_context_dispatch+0x1ee) [0x7f8cb957330e]
/usr/lib64/libglib-2.0.so.0(+0x45af8) [0x7f8cb9573af8]
/usr/lib64/libglib-2.0.so.0(g_main_loop_run+0x182) [0x7f8cb9574162]
gnome-power-manager() [0x41009b]
/lib64/libc.so.6(__libc_start_main+0xfd) [0x7f8cb8f3debd]
gnome-power-manager() [0x4089f9]
>>>>>