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I have a bluetooth keyboard Samsung bkb10. It is keyboard for andoind mainly, so it does not have alt, super(winkey), f1-f12, menu, but has lots of hotkeys(most of them work nice under linux). But some hotkeys are not working, and I want to make thems to behave as alt, f1-f12, menu. Also i want hotkeys functions too, so i would love to make smth like Fn button for hotkeys. Well, that is all i want. At least i need alt,super,menu and f1-f12, could not imagine it is so hard without them under linux. So, i was trying to use keytouch - no luck. It is able to read correct keysym, but keytouch-editor saves only part of it into its keyboard files, and it appears that needed keys are same for keytouch too. Anyway i did not see it works for me at all, even with with many keys acting the same way. Right now keys that i want to make as Alt, super, menu, do not work at all, have same scancodes, but have different keysyms:

xev shows same thing for some hotkeys, that do not work :

KeyRelease event, serial 39, synthetic NO, window 0x5400001,
root 0xf5, subw 0x0, time 12647284, (224,225), root:(224,253),
state 0x0, keycode 248 (keysym 0x0, NoSymbol), same_screen YES,
XLookupString gives 0 bytes: 
XFilterEvent returns: False

But kacpimon can recognize their keysyms and that they are different keys:

Input Layer:  Type: 4  Code: 4  Value: 787205
Input Layer:  Type: 1  Code: 240  Value: 0
Input Layer:  Sync
Input Layer:  Type: 4  Code: 4  Value: 787207
Input Layer:  Type: 1  Code: 240  Value: 1
Input Layer:  Sync

Same as getscancodes:

787205 (0xc0305)
787205 (0xc0305)
787207 (0xc0307)
787207 (0xc0307)

sudo evtest /dev/input/evt14 output for same keys:

Event: time 1457614378.384393, type 4 (EV_MSC), code 4 (MSC_SCAN), value c0305
Event: time 1457614378.384393, type 1 (EV_KEY), code 240 (KEY_UNKNOWN), value 1
Event: time 1457614378.384393, -------------- SYN_REPORT ------------
Event: time 1457614378.384420, type 4 (EV_MSC), code 4 (MSC_SCAN), value c0305
Event: time 1457614378.384420, type 1 (EV_KEY), code 240 (KEY_UNKNOWN), value 0
Event: time 1457614378.384420, -------------- SYN_REPORT ------------
Event: time 1457614378.681877, type 4 (EV_MSC), code 4 (MSC_SCAN), value c0307
Event: time 1457614378.681877, type 1 (EV_KEY), code 240 (KEY_UNKNOWN), value 1
Event: time 1457614378.681877, -------------- SYN_REPORT ------------
Event: time 1457614378.775600, type 4 (EV_MSC), code 4 (MSC_SCAN), value c0307
Event: time 1457614378.775600, type 1 (EV_KEY), code 240 (KEY_UNKNOWN), value 0
Event: time 1457614378.775600, -------------- SYN_REPORT ------------

As you can see scancodes are same even in kacpimon, but keysyms are different in kacpimon, getscancode, evtest for every single key, but not for xev and other tools. Also i think that getscancodes actually is showing keysyms, but not scancodes for them. I know that xmodmap is old and i should not use, and that i should xkb. I was able to find some answer that could help me, if i wasn't noob - Custom keyboard layouts: adding a character for which no keysym is defined Also that link might be usefull but it is outdated, so i cannot check it-Don't use showkey or xev -- use udev and evtest instead.

But i cannot do it with xkb or xmodmap, i just cannot understand how. Please help me, working on it for 3 full days and still did not find any solution... Thank you very much!

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Ok, solution was found here- Make the zoom slider of Microsoft Natural Ergonomic Keyboard 4000 and 7000 scroll up and down, in 14.04 (Trusty) Read last comment. It turned out, that evtest is really powerful, and it can show scancodes too. Read /lib/udev/hwdb.d/60-keyboard.hwdb very carefull, i had to read it 100 times to make it work. If you need to transorm your hex to 4 digit hex i used this - http://www.binaryhexconverter.com/hex-to-decimal-converter

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