what is the output of "xev" when you type plain KP_Add and Ctrl+KP_Add
into it?

What is the output of "xmodmap"

I send some files. I include them here, as attaching doesn't work
for me right now.

xev: I press KP_Add, Ctrl+KP_Add, KP_Enter and Ctrl+KP_Enter.
Ctrl+KP_Enter appears correctly as Ctrl+KP_Enter in gnome-termina.
That ``1 bytes: "M"'' means an ascii 10, of course :)

KeyPress event, serial 25, synthetic NO, window 0x1e00001,
    root 0x48, subw 0x0, time 1058146, (119,65), root:(124,111),
    state 0x0, keycode 86 (keysym 0xffab, KP_Add), same_screen YES,
    XLookupString gives 1 bytes:  "+"

KeyRelease event, serial 25, synthetic NO, window 0x1e00001,
    root 0x48, subw 0x0, time 1058224, (119,65), root:(124,111),
    state 0x0, keycode 86 (keysym 0xffab, KP_Add), same_screen YES,
    XLookupString gives 1 bytes:  "+"

KeyPress event, serial 25, synthetic NO, window 0x1e00001,
    root 0x48, subw 0x0, time 1058755, (119,65), root:(124,111),
    state 0x0, keycode 37 (keysym 0xffe3, Control_L), same_screen YES,
    XLookupString gives 0 bytes:  ""

KeyPress event, serial 25, synthetic NO, window 0x1e00001,
    root 0x48, subw 0x0, time 1058939, (119,65), root:(124,111),
    state 0x4, keycode 86 (keysym 0xffab, KP_Add), same_screen YES,
    XLookupString gives 1 bytes:  "+"

KeyRelease event, serial 25, synthetic NO, window 0x1e00001,
    root 0x48, subw 0x0, time 1059017, (119,65), root:(124,111),
    state 0x4, keycode 86 (keysym 0xffab, KP_Add), same_screen YES,
    XLookupString gives 1 bytes:  "+"

KeyRelease event, serial 25, synthetic NO, window 0x1e00001,
    root 0x48, subw 0x0, time 1059165, (119,65), root:(124,111),
    state 0x4, keycode 37 (keysym 0xffe3, Control_L), same_screen YES,
    XLookupString gives 0 bytes:  ""

KeyPress event, serial 25, synthetic NO, window 0x1e00001,
    root 0x48, subw 0x0, time 1059528, (119,65), root:(124,111),
    state 0x0, keycode 108 (keysym 0xff8d, KP_Enter), same_screen YES,
    XLookupString gives 1 bytes:  "M"

KeyRelease event, serial 25, synthetic NO, window 0x1e00001,
    root 0x48, subw 0x0, time 1059587, (119,65), root:(124,111),
    state 0x0, keycode 108 (keysym 0xff8d, KP_Enter), same_screen YES,
    XLookupString gives 1 bytes:  "M"

KeyPress event, serial 25, synthetic NO, window 0x1e00001,
    root 0x48, subw 0x0, time 1059885, (119,65), root:(124,111),
    state 0x0, keycode 37 (keysym 0xffe3, Control_L), same_screen YES,
    XLookupString gives 0 bytes:  ""

KeyPress event, serial 25, synthetic NO, window 0x1e00001,
    root 0x48, subw 0x0, time 1060125, (119,65), root:(124,111),
    state 0x4, keycode 108 (keysym 0xff8d, KP_Enter), same_screen YES,
    XLookupString gives 1 bytes:  "M"

KeyRelease event, serial 25, synthetic NO, window 0x1e00001,
    root 0x48, subw 0x0, time 1060180, (119,65), root:(124,111),
    state 0x4, keycode 108 (keysym 0xff8d, KP_Enter), same_screen YES,
    XLookupString gives 1 bytes:  "M"

KeyRelease event, serial 25, synthetic NO, window 0x1e00001,
    root 0x48, subw 0x0, time 1060300, (119,65), root:(124,111),
    state 0x4, keycode 37 (keysym 0xffe3, Control_L), same_screen YES,
    XLookupString gives 0 bytes:  ""


xmodmap: I use xfree 4.3 and use the commands "setxkbmap us" and
"setxkbmap hu" to change the layout. Anyway, I send the xmodmap
output.

xmodmap:  up to 2 keys per modifier, (keycodes in parentheses):

shift       Shift_L (0x32),  Shift_R (0x3e)
lock        Caps_Lock (0x42)
control     Control_L (0x25),  Control_R (0x6d)
mod1        Alt_L (0x40),  Alt_R (0x71)
mod2        Num_Lock (0x4d)
mod3
mod4        Super_L (0x73),  Super_R (0x74)
mod5

keycode  37 = Control_L
keycode  77 = Num_Lock Pointer_EnableKeys
keycode  78 = Scroll_Lock
keycode  79 = KP_Home KP_7
keycode  80 = KP_Up KP_8
keycode  81 = KP_Prior KP_9
keycode  82 = KP_Subtract XF86_Prev_VMode
keycode  83 = KP_Left KP_4
keycode  84 = KP_Begin KP_5
keycode  85 = KP_Right KP_6
keycode  86 = KP_Add XF86_Next_VMode
keycode  87 = KP_End KP_1
keycode  88 = KP_Down KP_2
keycode  89 = KP_Next KP_3
keycode  90 = KP_Insert KP_0
keycode  91 = KP_Delete KP_Decimal

I can reproduce this here, Ctrl+KP_Enter works but not 
Ctrl+KP_Add. So seems unrelated to hungarian keymap or 
anything like that.

Perhaps an Xkb issue related to the vidmode hotkeys...

Ctrl+KP_Add and Ctrl+KP_Substract are caught by vte... If vte didn't, they'd
work as keyboard shortcuts.

IMHO vte should not do that---it currently catches a few key combinations.

Bouncing to Nalin... 

Humm, donno how they were assigned to me...

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