I recently bought one of these flashy Antec cases for my Myth box, and found a lot of confusing and out of date information. So below is what I had to do to get the LCD portion of the case to work properly under Ubuntu 8.04 on an x86_64 machine.
I have not attempted to get the volume knob or the IR receiver to work, as I don't have a MCE-compatible remote control and lirc doesn't appear to easily handle multiple devices.
The appropriate device driver is lirc_imon.ko. There is one with the standard Ubuntu kernel, but it is not going to work with this case. There is an old patch out there, but don't use that. Just download the latest CVS of lirc and build/install that.
You will first need to download all of the utilities to build lirc (apt-get build-dep lirc). You will also need to apt-get install kernel-source. Be sure to do the following steps in the kernel source:
cp /boot/config-XXXXX .config
make oldconfig; make
(You can kill the make after a minute. It just needs to set up the
architecture-specific symlinks)
(in /usr/src): ln -s linux-source-XXXXX linux
Now configure the lirc source to build the imon_lcd device and type make. You don't have to do a complete install, just copy over the lirc_imon.ko in the /lib/modules/ directory, depmod, and reboot.
The Ubuntu version of lcdproc is out of date. I had to download, build, and install the latest cvs version.
From here, I just had to enable the use of LCD proc in the frontend configuration, and I was off to the races.