Lucid switchuser causes black screen

[NoOp]

On 05/24/2010 07:36 PM, arshad wrote:
...
> hi,
> no i'm using ati.
> 
> and i ran some of the commands you did in #81
> (not sure relevant though)
> 
> thanks
> 
> ==================
> 
> mypc at mypc-desktop:~$ apt-cache policy xorg
> xorg:
>   Installed: 1:7.5+5ubuntu1
>   Candidate: 1:7.5+5ubuntu1
>   Version table:
>  *** 1:7.5+5ubuntu1 0
>         500 http://lk.archive.ubuntu.com/ubuntu/ lucid/main Packages
>         100 /var/lib/dpkg/status
> mypc at mypc-desktop:~$ apt-cache policy xserver-xorg-core
> xserver-xorg-core:
>   Installed: 2:1.7.6-2ubuntu7
>   Candidate: 2:1.7.6-2ubuntu7
>   Version table:
>  *** 2:1.7.6-2ubuntu7 0
>         500 http://lk.archive.ubuntu.com/ubuntu/ lucid/main Packages
>         100 /var/lib/dpkg/status
> mypc at mypc-desktop:~$ apt-cache policy nvidia-96
> nvidia-96:
>   Installed: (none)
>   Candidate: 96.43.17-0ubuntu1
>   Version table:
>      96.43.17-0ubuntu1 0
>         500 http://lk.archive.ubuntu.com/ubuntu/ lucid/restricted
> Packages

Can you test when you have a chance:

$ sudo apt-get purge gnome-screensaver

And see if that resolves the issue?

If not, reinstall it:

$ sudo apt-get install gnome-screensaver

(of course you may have to logout/login)

and then check your ATI hardware drivers (System|Hardware Drivers) and
see if you are running a proprietary ATI driver? If so, uninstall the
proprietary driver & reboot to see if it still occurs. Thanks.

I was unable to reproduce on:

ATI Rage 128 Pro Ultra TF
ATI 3D Rage Pro AGP 1X/2X
Intel Mobile 4 Series Chipset Integrated Graphics Controller

I am only able to reproduce on the NV25GL [Quadro4 900 XGL] w/the
nvidia-96 proprietary driver installed. I've even tested with effect
'Normal' and 'Extra' (compiz working).