I can confirm this issue on a lenovo t400s running 64-bit Maverick kubuntu. Discovering a hot running laptop in your backpack is not a very nice experience. Using the workarounds from comments #35/43 (pm-utils script) and #18.3 (ppa kernel 2.6.36-020636-generic) work so far (~50 sleep cycles, previously every 5-10 cycles it would not go to sleep properly).
I can confirm this issue on a lenovo t400s running 64-bit Maverick kubuntu. Discovering a hot running laptop in your backpack is not a very nice experience. Using the workarounds from comments #35/43 (pm-utils script) and #18.3 (ppa kernel 2.6.36- 020636- generic) work so far (~50 sleep cycles, previously every 5-10 cycles it would not go to sleep properly).