[Bug 105102] Cannot shutdown computer with Kubuntu Feisty

[jwork123nl]

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Executive summary:
command line power down works, from KDE it works in about 35% of all cases.

Details:

When I go to terminal 1 with CTRL-ALT-F1, log in as root and execute "powerdown now"
the computer turns of, including showin immediately a nice Kubuntu logo. This works.

When I select "turn off" from KDE the system logs out of X normally, including playing the sound
and then the following happens:

20% of all cases: graphical garbage appears on top of screen and after a while a brief
flash of the kubuntu logo appears, just before the computer powers down

15% of all cases: kubuntu logo is shown and shutdown proceeds normally

65% of all cases:
monitor looses input signal and goes to sleep, computer completely stuck, have to
switch off manually by pressing power key for 7 seconds.

I seem to remember reading something like this a long time ago in the edgy forums,
cannot find it. My feeling is that the 

Operating system information:
Using Kubuntu Feisty, starting from Beta. 
Problem has always been present, no change
Using the ATI (and thus open source Radeon) display driver

System information:
Asus P4P800 deluxe mainboard
Samsung 172T lcd, using DVI input
Radeon 9200SE (280) video card

I could never shutdown with Edgy, which was the reason I did not install it, and kept with Dapper.
I hope that I will be able to shut down with Feisty!

** Affects: kubuntu-default-settings (Ubuntu)
     Importance: Undecided
         Status: Confirmed

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Cannot shutdown computer with Kubuntu Feisty
https://bugs.launchpad.net/bugs/105102