Public bug reported:

Window decorations buttons (close, minimize, maximize) consistently lack
the subtle lightning effect when the mouse is over them. Other times the
buttons are shown as disabled which is misleading since the buttons work
perfectly fine. Maybe one time in a hundred I get a window exposing the
correct behavior. It looks like it is totally random.

Since mutter/gnome-shell does not show the same issue (with the same
Ambiance theme), I presume this issue is compiz/unity specific.

I attached a screen recording session to better explain the issue.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: unity 5.6.0-0ubuntu4
ProcVersionSignature: Ubuntu 3.2.0-18.29-generic 3.2.9
Uname: Linux 3.2.0-18-generic x86_64
NonfreeKernelModules: fglrx
.tmp.unity.support.test.0:
 
ApportVersion: 1.94.1-0ubuntu2
Architecture: amd64
CompizPlugins: 
[core,composite,opengl,compiztoolbox,decor,vpswitch,snap,mousepoll,resize,place,move,wall,grid,regex,imgpng,session,gnomecompat,animation,fade,unitymtgrabhandles,workarounds,scale,expo,ezoom,unityshell]
CompositorRunning: compiz
Date: Fri Mar 16 10:40:39 2012
DistUpgraded: Fresh install
DistroCodename: precise
DistroVariant: ubuntu
DkmsStatus: fglrx, 8.950, 3.2.0-18-generic, x86_64: installed
GraphicsCard:
 Advanced Micro Devices [AMD] nee ATI Madison [Radeon HD 5000M Series] 
[1002:68c1] (prog-if 00 [VGA controller])
   Subsystem: Hewlett-Packard Company Device [103c:1448]
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Alpha amd64 (20120209)
MachineType: Hewlett-Packard HP Pavilion dv6 Notebook PC
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-18-generic 
root=UUID=ed4250b4-b698-4a74-8839-c3defb08f26e ro quiet splash vt.handoff=7
SourcePackage: unity
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 09/14/2010
dmi.bios.vendor: Hewlett-Packard
dmi.bios.version: F.13
dmi.board.asset.tag: Base Board Asset Tag
dmi.board.name: 1448
dmi.board.vendor: Hewlett-Packard
dmi.board.version: 65.2E
dmi.chassis.type: 10
dmi.chassis.vendor: Hewlett-Packard
dmi.chassis.version: N/A
dmi.modalias: 
dmi:bvnHewlett-Packard:bvrF.13:bd09/14/2010:svnHewlett-Packard:pnHPPaviliondv6NotebookPC:pvr059B110000243010010020100:rvnHewlett-Packard:rn1448:rvr65.2E:cvnHewlett-Packard:ct10:cvrN/A:
dmi.product.name: HP Pavilion dv6 Notebook PC
dmi.product.version: 059B110000243010010020100
dmi.sys.vendor: Hewlett-Packard
version.compiz: compiz 1:0.9.7.0+bzr3035-0ubuntu1
version.fglrx-installer: fglrx-installer N/A
version.ia32-libs: ia32-libs 20090808ubuntu34
version.libdrm2: libdrm2 2.4.30-1ubuntu1
version.libgl1-mesa-dri: libgl1-mesa-dri 8.0.1-0ubuntu4
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 8.0.1-0ubuntu4
version.xserver-xorg-core: xserver-xorg-core 2:1.11.4-0ubuntu6
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.7.0-0ubuntu1
version.xserver-xorg-video-ati: xserver-xorg-video-ati 
1:6.14.99~git20111219.aacbd629-0ubuntu2
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.17.0-1ubuntu4
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 
1:0.0.16+git20111201+b5534a1-1build2

** Affects: unity (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug compiz-0.9 precise regression reproducible ubuntu

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https://bugs.launchpad.net/bugs/956812

Title:
  Ambiance window decorations lack the "hover" effect and sometimes are
  shown as disabled.

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