The genuine ATI drivers for Linux do not support the additional functions of the All In Wonder cards. The ATI drivers only support the video, OpenGL, and hardware video acceleration. There are some free open source drivers for the ATI functions such as video in/out, tv tuner, et. al. These drivers are available in the Gatos project. They are a collection of individual drivers. There isn't just one package to install; there are about four packages with each one performing one function. The Gatos software may or may not depend on Video for Linux software also being available.
The Gatos drivers are available at sourceforge.net. Just put gatos into the search box on the sourceforge.net main page. It will show you a link to the main project and a couple of other related links. I've never used the Gatos drivers just because I always had some other project that I considered a higher priority. Since I'm still using an ATI Radeon 8500 All In Wonder card I may yet decide to use the Gatos drivers. As far as I can tell the Gatos drivers can be used along with the genuine ATI graphic/OpenGL driver.
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Linux does indeed support plug-n-play. Since I use a prebuilt kernel from SuSE I don't know how to install the pnp drivers. I can see that they are active in the /var/log/boot.msg file. Here are two snips from that file that you could look for in your own boot log file or dmesg.
<4>ACPI: PCI Interrupt Link [LNKC] (IRQs 3 4 *5 6 7 10 11 12 14 15)
<4>ACPI: PCI Interrupt Link [LNKD] (IRQs 3 4 5 6 7 10 11 12 14 15) *0, disabled.
<6>Linux Plug and Play Support v0.97 (c) Adam Belay
<6>PCI: Using ACPI for IRQ routing
<4>ACPI: PCI Interrupt Link [LNKB] enabled at IRQ 1
...
...
...
<4>vesafb: probe of vesafb0 failed with error -6
<6>isapnp: Scanning for PnP cards...
<6>isapnp: No Plug & Play device found
<6>Real Time Clock Driver v1.12
You probably also need to have the hardware scan daemon running.
# ps -ef | grep scand
root 2284 1 0 Dec23 ? 00:00:00 [hwscand]
root 2883 1 0 Dec23 ? 00:00:00 [hwscand]
This is also automatically set up for me because I use SuSE. One day I may install Linux From Scratch or something similar in order to learn all of this stuff but for now I find that using a full featured and fully configured distro is very convenient.