AVerMedia AVerTV Digi Volar X (A815)
It is perfectly supported in Linux, even the IR remote.
[root@host] lsusb ... ID 07ca:a815 AVerMedia Technologies, Inc. ...
- MXL5003S as a tuner
Firstly, you need to copy the following firmware dvb-usb-af9015.fw in your /lib/firmware/ directory, or in the directory where your system will search for it.
It is supported in the latest v4l-dvb, so you have to download them first. Either getting  or using mercury See the How to Obtain, Build and Install V4L-DVB Device Drivers for all the details.
IR Remote Support
The latest developtment version of the driver gives support to the RM-FP remote control (thanks to Jose Alberto Reguero . NOTE: THAT PATCH is already included in the current development version of v4l-dvb). But there are other remote control versions bundled with the device. RM-KS is one of those. Taking a look into the files that the CDROM driver installs, there are five files named: AP6RMFP.BIN, AP6RMHR.BIN, AP6RMHV.BIN, AP6RMJH.BIN, AP6RMKS.BIN, where the correct IR table to be used with each remote control (FP, HR, HV, JH, KS) is given. This patch  (copy from the first diff line until the end) adds support for the KS remote control, using the option remote=5 when dvb-usb-af9015 module is loaded. In debian that is made adding (as root) a file called, for example, dvb, in the directory /etc/modprobe.b/ with the line
options dvb_usb_af9015 remote=5
Until the patch goes into the repository files, before you compile the drivers you should apply the patch:
$ cd v4l-dvb-XXXXXXXX/linux/drivers/media/dvb/dvb-usb $ cp /wherever/you/downloaded/the/patch/af9015.diff . $ patch < af9015.diff
and then compile the drivers, and install them.
There is a lot of information on how to make lirc work in Hauppauge_WinTV-NOVA-T-Stick#Remote_Control_Support
Due to some problems with the HID devices, in some machines the IR reception is buggy  (i.e. irw gets correctly first button pressed, but then gets stuck in a weird loop where the button seems pressed all the time) To solve this, you can create the file /etc/modprobe.d/usbhid containing:
options usbhid quirks=0x07ca:0xa815:0x04
and then execute
$ sudo update-initramfs -u
and reboot. The problem should be solved that way.
Test your drivers
Once compiled you can try this: Testing_your_DVB_device. Kaffeine seems the easiest/fastest way to check if it works.
--Pipeta 17:19, 25 January 2009 (CET)