xbindkeys doesn't work with XF86audio*, how to configure key mapping correctly?

Question

I want to map my Fn + Left (XF86audioprev) and Fn + Right (XF86audionext) keys to function as the "Home" (Num_Lock + 7) and "End" (Num_Lock + 1) keys.

I tried using xbindkeys with xte. At the beginning nothing happened when I pressed the buttons so I tried different things. I discovered that the xte commands where executed too early so I added a delay like suggested in another thread. I tried using 3 as the key to map and it works. This is what is written in the "/home/me/.xbindkeysrc" file:

#HomeFNLeft
"xte 'usleep 100000' 'key Num_Lock' 'key KP_Home' 'key Num_Lock'"
    m:0x0 + c:12 + Release
    3 

This works perfectly but when I change the key to the Fn+Left this fails

#HomeFNLeft
"xte 'usleep 100000' 'key Num_Lock' 'key KP_Home' 'key Num_Lock'"
    m:0x0 + c:173
    XF86AudioPrev 

The configuration above doesn't work. I don't know why. Is there an incompatibility between the media keys and xbindkeys? Thank you and hope you can help me.

My specs:

*OS: Ubuntu 16.04

*kernel: 4.8.0-58-generic

*Laptop Model: ASUS ROG Strix GL753VD

Answer 1

I had the exactly same problem Finally i've solved it, so it works now, but not very well. I wrote

# my Shift Home
"xte 'usleep 200000' 'keydown Shift_L' 'key Home' 'keyup Shift_L'"
Control+Shift + Left | m:0x5 + c:113

# my Home
"xte 'usleep 200000' 'key Home'"
Control + Left | m:0x4 + c:113

# my Shift End
"xte 'usleep 200000' 'keydown Shift_L' 'key End' 'keyup Shift_L'"
Control+Shift + Right | m:0x5 + c:114

# my End
"xte 'usleep 200000' 'key End'"
Control + Right | m:0x4 + c:114

But it this way it works only with pretty fast presses, so it might be not very comfortable - try to play with sleep-time. It seems like keyboard is busy some time after Left/Right was pressed, so it can't read keys and ignore Home/Right from xte if sleep time is too short. P.S. sorry for my english, i'm not native speaker.