I used to have a USB headset so I will have several device in the Phonon multimedia framework.
Here is my setting panel: http://i.imgur.com/5sn6P7O.png

Now I do not want to see the gray device anymore in that panel since I lost my USB headset. How can I remove them in that panel? KDE does not offer such feature for me. And It seems that even the removal of the whole ~/.kde4 does not work for me.

BTW, I'm using the PulseAudio on me system.

Which exact KDE release do you use and on which distribution?

Try removing the contents of /var/tmp/kdecache-$USER/libphonon/ and ~/.config/kde.org/libphonon.conf.
Please be aware that removing the second file will likely wipe your preferred devices preferences.

I have remove the second file but it seems that these items are still there.

I cannot found /var/tmp/kdecache-$USER/libphonon/. My user is called cocular and

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tmp # tree /var/tmp/kdecache-cocular
kdecache-cocular
├── bookmarkrunnerfirefoxdbfile.sqlite
├── favicons
├── help
│   └── en__dolphin__index.docbook
├── http
├── icon-cache.kcache
├── KRunner-Favicons-firefox-default
│   ├── 16216_favicon
│   ├── 56353_favicon
│   ├── 57541_favicon
│   ├── 58097_favicon
│   └── 61923_favicon
├── ksplashx
│   └── Default-1366x768-background.png
├── ksycoca4
├── ksycoca4stamp
├── Personal Calendarrc
├── plasma-svgelements-default_v2.0
├── plasma_theme_default_v2.0.kcache
├── plasma_theme_internal-system-colors.kcache
└── plasma-wallpapers
    └── usr
        └── share
            └── wallpapers
                └── Elarun
                    └── contents
                        └── images
                            ├── 2560x1600.png_#000000_0_1366x768.png
                            └── 2560x1600.png_#000000_0_1920x1080.png

12 directories, 17 files

I'm using Gentoo Linux, KDE 4.13.0

Okay. Have you tried removing ~/.config/kde.org/libphonon.conf in that case? It is possible that the older hardwaredatabase cache file has since been retired.

No. That doesn't work.

Please remove ~/.pulse/ outside of KDE - and without Pulseaudio running. This will reset your multimedia device preferences in the process as well unfortunately.

That's seems to work. However, my pulseaudio's config dir is in

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~/.config/pulse

. That's may the reason I haven't done it before.