Comment 18 for bug 762203

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Stewy (brian-stewart6) wrote : Re: Computer is not turned off at sutdown

I'm having same the same problem since move from 10.10 to 11.04 about 3 weeks ago It did work OK for a while with early April version of 11.04 beta then went this way after an upgrade. Have re-installed twice - no luck. Though it was a Unity problem at first and raised a query but no response.
https://answers.launchpad.net/ubuntu/+source/unity/+question/153784

 Using Sony Laptop VGN-A617S with ATI RADEON X700.
Thought it was Unity at first but have removed that (which sometimes worked OK). Does not shut down properly even after 2 hours!. Have also noticed during startup that screen shows white vertical bars on black background for about 1 second. During shut-down the Ubuntu screen with 5 dots does not appear. About 1 in 10 - 1 in 20 times everything works OK just once.
Again like many others if any further info would help please let me know (but I need simple instructions being a novice).