I did find this as well, but it is 2 years old from mythbuntu 8.10
maybe i need to get schedules direct?
(red bold below)
3. Video Sources
Next escape back to the main setup screen. Select #3 Video Sources. Here is where you tell mythtv the methods by which you will feed your mythtv installation television. For example, I have two sources. First, I get a few ATSC stations from over the air using an outside antenna. Second, I have the s-video of the HVR-1600 hooked up to the s-video output of my Dish Satellite Receiver Box. The first source I called antenna and used the “scan for channels” to cause Mythbuntu’s backend program to scan all 83 channels while adding the active channels to an internal table. The second source I labeled “dish” and was created by subscribing to Schedules Direct
Source (dish sat receiver) connected to HVR1600 Mpeg encoder
Note: Don’t hit Scan for Channels here where you are configuring the Capture Device /dev/Video0. After all, the hardware encoder can’t scan. It creates mpeg video with whatever baseband video you have connected to the HVR s-video input. The only time Scan for channels should be clicked is where the HVR is connected to an outside antenna or a cable TV line. So you would click Scan for channels, for example, if you were configuring Capture Device: DVB0: In my case, I ” Fetch channels from listing source” when I want to bring down a list of my dish network channels I subscribe to. The list is configured at the Schedules Direct Site(See screen shot below) This was an endless source of confusion for me. Anyway if you want, you can escape out to the Main window (sprocket wheels) and look at what channels you have configured by choosing #5. the Channel Editor.