How can I tell which driver is being used to support a specific device ?.
I'm using the latest version of Ubuntu (desktop) on an MSI board which uses the AMD SB700 chipset and I want to find out what driver is being used for the SATA controller.
The ultimate aim is to try and get VMWare's ESXi 3.5 working on this system, it wont install at the moment because it doesn't recognise the disk controller, but Ubuntu does recognise it. I thought if I knew what driver Ubuntu was using I might see that ESXi had the same driver.

/sbin/lsmod will give you the list of all the kernel modules that have been loaded, it might give you some indication.

Try lshw. If it's not installed it's probably in your distro's repos. It can output as HTML which I find is often the easiest way to read it's output.

Needs to be run as root so on Ubuntu
Look through the output and I find

id:
storage
description: SATA controller
product: JMicron 20360/20363 AHCI Controller
vendor: JMicron Technologies, Inc.
physical id:
0
bus info:
pci@0000:03:00.0
version: 03
width: 32 bits
clock: 33MHz
capabilities: storage pm pciexpress ahci_1.0 bus_master cap_list
configuration:
driver = ahci
latency = 0
module = ahci

Thanks for this..seems the controller is seen as a AHCI device...hopefully the AHCI driver that ESXi contains will work with the controller on my mobo. Just need to edit a config file, reburn the CD and keep my fingers crossed.