Hi all, I have a similar problem.
I'm running Kubuntu Hardy and have a Nvidia 8800GTS graphics card, drivers up
to date, system updated as well.
When I activate desktop effects, everything works, they look gorgeous and seem
to work nearly flawlessly. But... when I log out and attempt to log in once
more, I get a nice black screen with only the mouse cursor visible. I can see
that the system is running in the background, I can start an application with
alt+f2, e.g. konsole, and then the cursor even changes when navigating to the
area where the window should be.
In my case, I do not think it is a single desktop effect that causes the
problem. Only checking "enable desktop effects" causes the problem for me,
everything else can remain unchecked, it still happens after re-login. I tried
all sorts of combinations, both OpenGL and XRender, all the different modes,
none had any results though.
For those experiencing a similar problem and not knowing how to fix it in order
to keep going without desktop effects, I have a few suggestions:
Note that I have an Nvidia video card and it will not be exactly the same with
ATI or others.
Option A:
1) When booting, in GRUB instead of the normal option, choose recovery mode.
2) When this loads, choose the third option - run xfix, this will modify your
xorg.conf and set it to defaults.
3) Then choose the first option - normal boot - your system will boot up
without your nvidia drivers and this will stop desktop effects from starting
resulting in a black screen. It will be a bit slow and laggy but you can
survive the minute.
4) Then just open System settings as you are used to and disable desktop
effects.
5) Once they are off, you have to get your nvidia drivers back - you do this by
simply executing "sudo nvidia-xconfig" in a shell.
Option B:
You do not have to reboot to fix it, you can do the work xfix does manually.
1) Log in using a failsafe session or even console login.
2) Open your /etc/X11/xorg.conf in an editor (e.g. "sudo nano
/etc/X11/xorg.conf") - you have to have permissions to modify it.
3) Replace:
Section "Device"
Identifier "Device0"
Driver "nvidia"
VendorName "NVIDIA Corporation"
EndSection
With:
Section "Device"
Identifier "Configured Video Device"
EndSection
4) Start the xserver - in console login, just type "startx", if in failsafe,
ctrl+alt+backspace logs you out and there you can just log in as you would
normally.
5) Carry on with step 3 in option A.
Option C:
Another way of fixing would be renaming or removing your .kde4 directory, but
like that you would loose all your settings, like this they stay in place.
I hope this gets resolved soon because the effects look really nice and I
really look forward to having them on and working.
If you require any further information please ask.
Richard
--
blank screen with kwin effects
https://bugs.launchpad.net/bugs/182288
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