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When I click on 'Suspend' in 12.04, my computer does not 'suspend'. It just automatically resumes from the suspend and then returns to the password prompted lock screen. Information about my computer:

Kernel: Linux 3.2.0-29-generic i686
Distro: Ubuntu 12.04.1 LTS
CPU:    AMD Athlon(tm) 64 X2 Dual Core Processor 4800+
2 cores/threads
2511.546 MHz
RAM:    1.96 GiB
GPU:    GeForce 8400 GS/PCIe/SSE2/3DNOW!
OpenGL 3.3.0 NVIDIA 295.40
GLSL 3.30 NVIDIA via Cg compiler
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1 Answer 1

I once had a problem where my router would send a wake signal (Ethernet.) Have you tried unplugging each hardware item in turn?

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