gaussian blur and shadow don't work together

[Daniël Sonck]

Binary package hint: compiz

When you enable the alpha blur on 'any' window and set the type to gaussian blur
with settings:
radius 7, strength 0.5

it doesn't update the shadow correctly, it (sometimes) even applies blur to the shadow itself. (see picture)

I expected that the shadow remains the same (just as in the pre natty compiz version) and only apply the blur to decoration or semi transparent parts of windows. I definitely don't expect these functions to collide and result in a strange shadow.

lsb_release -rd
Description: Ubuntu Natty (development branch)
Release: 11.04

compiz:
  Installed: 1:0.9.4git20110322-0ubuntu5
  Candidate: 1:0.9.4git20110322-0ubuntu5
  Version table:
 *** 1:0.9.4git20110322-0ubuntu5 0
        500 http://archive.ubuntu.com/ubuntu/ natty/main amd64 Packages
        100 /var/lib/dpkg/status

[Daniël Sonck (daniel-sonck)]

Sometimes my background picture (I use the wallpaper plug-in) shines through

[Carkis (carlosdark)]

OK, now if I modify the shadow settings in "Window Decorator" it really affects the windows and the blur effect has improved BUT it still gives me graphical glitches under the shadows. This was working perfectly with ATI drivers 11.3 and out-of-the-box compiz under Lucid.

Note: System up-to-date until May 1st 2011 and fglrx

[Ignacy Gawędzki (iazz)]

I have exactly the same experience with nvidia-current 270.41.06-0ubuntu1 and compiz 1:0.9.4+bzr20110415-0ubuntu2. It only happens with gaussian blur, not with neither mipmap nor 4xbilinear.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Axel H. (staff-pro-unreal)]

On my setup gaussian blur does not blur anything at all with nvidia-current drivers.

[fcole90 (fcole90)]

Thank you for taking the time to report this bug. We have tried to recreate this on the latest release of Ubuntu and cannot reproduce it. This bug is being marked as Invalid. If you believe the problem to still exist in the latest version of Ubuntu please comment on why that is the case and change the bug status to NEW.