How to burn DVDs with limited speed, using wodim under Linux?

The command is the same as when burning CDs with limited speed, just that you need to use DVD speed factors instead of CD speed factors. Not all factors work; you can see what will work in the line “Starting to write CD/DVD at speed   4.0 in dummy SAO mode for single session.” shown just before starting to burn in dummy mode.

With the Panasonic DVR-K05 burner for example, speeds 2 and 4 do work, and 4 is the maximum supported. If you specify an unsupported speed factor, it is corrected to its nearest lower working equivalent.
To specify your desired speed, use commands like:

• wodim speed=2 -v -dao /path/to/image.iso;
• wodim speed=4 -v -dao /path/to/image.iso;

If you do so, wodim will burn with that speed right from the start. But it might be that, when specifying speed=4, wodim will start buring with speed=2 and accelerate later, just as it does when not specifying any speed value.