black bar in screen with 1280x800 laptop display

[tonfilm]

hi,

compiz works great if i have 1024x768 resolution, but if i switch to 1280x800 everything is sharp, but i have a black bar on the right side of my screen. seems to be the missing part from 1024 to 1280... if i move windows over there it looks like the backbuffer is not cleared.

my system is:
dell inspiron 8500 2GHz P4m
Radeon 9000 Mobility with radeon open source driver
Kubuntu Edgy
installed compiz with this tutorial:
http://gandalfn.wordpress.com/howto/howto-compiz-aiglx-on-edgy/

thx for any help!

[RYX]

Does that happen to all applications? Or does the panel expand to the full width and only the bg is missing? And if you move the windows through the black area, do you see the windows contents? Just some thoughts, because I don't heard of that yet and maybe it is related to the desktop (so gnome/kde).

[tonfilm]

yes, only the background is missing, i can see the windows content. but i will do some further tests and post them here tomorrow (i have gnome installed too)...

[Arc]

Hi, I have quite the same problem on my laptop:
- Dell Latitude C640
- ATI Mobility Radeon 7500 (M7 LW) open source "radeon" driver
- Debian Etch
- X.org 7.1
- Compiz 0.2.2
- Gnome

If I set the resolution to 1400x1050 (the native resolution of my LCD) I get "background garbage" on the right side of the screen.
However, if I move a window over the garbage it still displays correctly, but when I move it away compiz doesn't update the background.
Unfortunately, this doesn't apply to the panel.
If I set the resolution to 1024x768 or less, it works.

I also have another problem: window decorations are not working on large windows. I just get white spaces. The buttons are still there (if I move the mouse there I get tooltips!) and I can even resize them (and if I make them small enough, the decorations are painted correctly).

Do you think I should post a bug report?

[mikedee]

Make sure that you have this option checked.

/apps/compiz/general/screen0/options/detect_outputs

You could also uncheck it and change this option

/apps/compiz/general/screen0/options/outputs

to something like 1280x800+0+0

[Arc]

uhm, that didn't work for me, tnx anyway

By the way, the effect is really curious. If I set a skydome background, this will be initially displayed in the "garbage bar". Other effects look right (but for the blank decoration on large windows).

If I rotate the cube *the bar is rotated with the cube*! It gets repainted (with the skydome background) and I even get a nice shadow (just as if the desktop was a window on top of it).
I didn't notice that at first, perhaps this info is useful to developers.

[Phatfiddler]

I have this exact same problem. Compiz will only correctly work in 1024x768 resolution. I have included some screen shots to give you an idea of what we are working with. You may notice that the panel does work in the "garbage area", but windows and even the panel leave trails behind if they are moved.

Arc: The same problem occurs for me if Metacity themes are enabled in Compiz. Disabling this corrects the problem.

EDIT: Come to think of it...i used the gandalfn method as well.

http://www.cutlersoftware.com/Screenshot.png
http://www.cutlersoftware.com/Screenshot-1.png
http://www.cutlersoftware.com/Screenshot-2.png

[Arc]

Arc: The same problem occurs for me if Metacity themes are enabled in Compiz. Disabling this corrects the problem.

It worked! Thank you, Phatfiddler. I also confirm we have the same problem at high resolutions.
Hope this will get fixed someday!

[elempoimen]

I'm thinking there has to be a fix for this. I have no problems running Compiz on openSUSE 10.2 at the same resolution. I prefer Ubuntu (much faster)--but having Compiz is important. The Ubuntu solution would be better than SUSE's, save for this one problem.

[elempoimen]

Oh, the other thing I noticed is that no windows appear in the panel while all of this is going on.

[Prototype]

hi,

compiz works great if i have 1024x768 resolution, but if i switch to 1280x800 everything is sharp, but i have a black bar on the right side of my screen. seems to be the missing part from 1024 to 1280... if i move windows over there it looks like the backbuffer is not cleared.

my system is:
dell inspiron 8500 2GHz P4m
Radeon 9000 Mobility with radeon open source driver
Kubuntu Edgy
installed compiz with this tutorial:
http://gandalfn.wordpress.com/howto/howto-compiz-aiglx-on-edgy/

thx for any help!

The solution to this problem is to set a Virtual screen resolution in your xorg.conf

Here's the screen section in my xorg.conf

Section "Screen"
Identifier "Default Screen"
Device "ATI Mobility Radeon 9200"
Monitor "Generic Monitor"
DefaultDepth 24
SubSection "Display"
Depth 24
Virtual 1280 800
EndSubSection
EndSection