I have the same: IBM T21 version 7.10. Each time I select stand-by, log off, 
hibernate the screen goes black and that's it. I have to switch the computer of 
and on again.
I am quite new to Ubuntu. Perhaps this might help for troubleshooting: 
Before I used Ubuntu I used the Knoppix live CD. Screen went blank when system 
booted. Workaround was to select fb 1024*768
I then installed Knoppix on the HDD, system started and shut down as per design

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Switch User freezes at blank screen
https://bugs.launchpad.net/bugs/112518
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