I have found that I don't see this bug when I leave a CD in the drive. I have put the output of lshw up at http://ormiret.com/bugreport.txt IDE chip is an Intel ICH6 family 82801FB/FBM/FR/FW/FRW with a PHILIPS CD-RW/DVD-ROM SCB5265 -- HAL blocks suspend https://launchpad.net/bugs/40800