Public bug reported:

Binary package hint: gnome-panel

Description: Ubuntu lucid (development branch)
Release: 10.04
gnome-panel: 1:2.30.0-0ubuntu1
compiz: 1:0.8.4-0ubuntu13

Using updated Lucid (as of 04/01/10) the GNOME panel no longer blurs the
desktop background behind it properly. I'm using the Compiz Blur plugin
(Blur Filter: Gaussian, Gaussian Radius: 15, Gaussian Strength: 0.1000,
Mipmap LOD: 5, Independent texture fetch), Compiz Opacity, Brightness
and Saturation plugin ((class=Gnome-panel) & class=90) and a png
background image for the panel with an alpha channel (approx. 25%
opaque).

Before this bug the panel was beautiful and the text clearly readable
with most backgrounds, but now it looks pretty bad unfortunately. I've
experimented with different settings, themes, etc., but the effect
remains the same. If I use Alt-Middlemouse over the panel to gradually
adjust the panel opacity, it will slightly blur the desktop background
at around the 25% opaque mark, but the blur strength doesn't correspond
at all to the blur strength of other windows' opacity levels.

With the panel set to 25% opaque, moving a window behind the panel will
result in the window being more blurry than the desktop background,
where before they'd be blurred by the same amount. Using the panel
properties (Solid color with transparency) results in no blurring at all
of the background or windows moved underneath it. Using only the alpha
channel in the panel background image for transparency results in no
blur at all in the desktop background and any windows moved under the
panel can't be seen at all.

There are several similar problems here, all of which I hope are related
to one or more recent changes in gnome-panel or Compiz and/or its
plugins. Which themes are used seems to be irrelevant.

Here's the panel background image I'm using if anyone would like to experiment 
with this:
http://www.eightvirtues.com/misc/bar_horizontal_05_supertrans_32.png

Here's my Compiz settings:
http://www.eightvirtues.com/misc/Compiz_Settings (right-click, Save Link As)

ProblemType: Bug
DistroRelease: Ubuntu 10.04
Package: gnome-panel 1:2.30.0-0ubuntu1
ProcVersionSignature: Ubuntu 2.6.32-18.27-generic 2.6.32.10+drm33.1
Uname: Linux 2.6.32-18-generic x86_64
NonfreeKernelModules: nvidia
Architecture: amd64
Date: Thu Apr  1 20:31:49 2010
InstallationMedia: Ubuntu 9.10 "Karmic Koala" - Release amd64 (20091027)
ProcEnviron:
 LANG=en_US.utf8
 SHELL=/bin/bash
SourcePackage: gnome-panel

** Affects: gnome-panel (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug lucid

-- 
transparent panel fails to properly blur desktop background
https://bugs.launchpad.net/bugs/553716
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