I read through all the posts on Multimedia keyboards on the site, and googled it too, but am still having a small problem. I have an HP Wireless Keyboard, that came with my Pavillion a265c PC. I've been able to get every extra button to work except for User, Video, Eject 2, Record, and the volume knob (no volume buttons, just a knob). They work fine in Windows, so it's not that they're not functioning. They're not recognized in xev. When I run showkey -s, all I get is a bunch of lines saying keyboard.c: can't emulate rawmode for keycode XXX, where XXX is a number around 240 or 250.
It does that with both the working and non-working buttons, but with the working buttons, I also get 4 two-digit hex numbers. I don't get that with the non-working buttons.

However, it doesn't even do that when I turn the volume knob. Actually, if I'm in a terminal, and I turn the volume knob, the cursor appears, as if I had pushed a mouse button.

When I run showkey -k, I get a bunch of lines that say
keycode XXX press
keycode XXX release
However with -k I get more or less the same results with the working and the non-working buttons.
Does anyone have any experience with this, or have any ideas how I might figure it out?

Well, I posted this a while ago, and no response. After some thought, has anybody any ideas yet?
I still haven't found any info, although I do remember reading an article a while ago, before I posted this question, about how to get a keyboard with an integrated trackball working properly, but I don't remember where I saw it, and can't find it anymore. I also only skimmed the article at the time, so I don't remember the procedure, but I think a similar procedure must be what I need to make this work. At least to get the volume knob working. It seems to be simulating extra mouse button presses, and I don't know anything about extra mouse buttons.

Maybe a little more info on my keyboard would help. As I said, it's wiireless. The receiver is USB, of course, and the receiver works for both my mouse and keyboard. My mouse doesn't work in certain environments, like FreeDOS, a bootable partition manager I have, etc. It just doesn't get recognized. That doesn't bother me. But it does work fine in Linux, without problems.

So does anybody know anything that might lead me to a solution?