Similar thing happens to me. Normally suspend and resume works perfectly, but once in a while it resumes alone just after suspend, and after that trying to suspend locks the machine hard. I do not know if it's a coincidence, but locks occurs only when I have the ethernet cable plugged in. Never happened with Linus vanilla kernels, but could be another coincidence too. Nothing special in dmesg or in logs.
Similar thing happens to me. Normally suspend and resume works perfectly, but once in a while it resumes alone just after suspend, and after that trying to suspend locks the machine hard. I do not know if it's a coincidence, but locks occurs only when I have the ethernet cable plugged in. Never happened with Linus vanilla kernels, but could be another coincidence too. Nothing special in dmesg or in logs.
Toshiba Satellite U305-S5077, intel graphic chipset, Ubuntu karmic up-to-date, on-board eth0 RTL8101e (r8169 driver), ath5k wireless driver.