i've been able to reproduce this on my lapdock. looking into it now.

can you post a copy of your advmame.rc? I had this problem when there was a duplicate entry in the file.

device_raw_firstkeyhack no
device_raw_mousedev[0] auto
device_raw_mousedev[1] auto
device_raw_mousedev[2] auto
device_raw_mousedev[3] auto
device_raw_mousetype[0] pnp
device_raw_mousetype[1] pnp
device_raw_mousetype[2] pnp
device_raw_mousetype[3] pnp
device_sdl_samples 512
device_sound auto
device_video auto
device_video_cursor auto
device_video_doublescan yes
device_video_fastchange no
device_video_interlace yes
device_video_output auto
device_video_overlaysize auto
device_video_singlescan yes
dir_artwork /home/pi/.advance/artwork:/usr/local/share/advance/artwork
dir_diff /home/pi/.advance/diff
dir_hi /home/pi/.advance/hi
dir_image /home/pi/.advance/image:/usr/local/share/advance/image
dir_inp /home/pi/.advance/inp
dir_memcard /home/pi/.advance/memcard
dir_nvram /home/pi/.advance/nvram
dir_rom /home/pi/.advance/rom:/home/pi/roms
dir_sample /home/pi/.advance/sample:/usr/local/share/advance/sample
dir_snap /home/pi/.advance/snap
dir_sta /home/pi/.advance/sta
display_adjust none

You are missing your input mappings.

They should look something like this:

input_map[p1_up] keyboard[1,scan0] or keyboard[0,8_pad] or keyboard[0,up] or keyboard[1,scan0]
input_map[p1_down] keyboard[1,scan0] or keyboard[0,2_pad] or keyboard[0,down] or keyboard[1,scan0]
input_map[p1_right] keyboard[1,scan0] or keyboard[0,6_pad] or keyboard[0,right] or keyboard[1,scan0]
input_map[p1_left] keyboard[1,scan0] or keyboard[0,4_pad] or keyboard[0,left] or keyboard[1,scan0]
input_map[p1_button1] keyboard[1,scan0] or keyboard[0,enter]
input_map[p1_button2] keyboard[1,scan0] or keyboard[0,space]
input_map[p1_button3] keyboard[1,scan0] or keyboard[0,rcontrol]
input_map[p1_button4] keyboard[1,scan0] or keyboard[0,rshift]
input_map[p1_button5] keyboard[1,scan0] or keyboard[0,enter] keyboard[0,space]
input_map[p1_button6] keyboard[1,scan0] or keyboard[0,rcontrol] keyboard[0,rshift]
input_map[p1_button7] keyboard[1,scan0] or keyboard[0,enter] keyboard[0,rcontrol]
input_map[p1_button8] keyboard[1,scan0] or keyboard[0,space] keyboard[0,rshift]
input_map[start1] keyboard[1,scan0] or keyboard[0,1]
input_map[start2] keyboard[1,scan0] or keyboard[0,2]
input_map[coin1] keyboard[1,scan0] or keyboard[0,1]
input_map[coin2] keyboard[1,scan0] or keyboard[0,2]
input_map[p2_up] keyboard[1,scan0] or keyboard[0,w]
input_map[p2_down] keyboard[1,scan0] or keyboard[0,s]
input_map[p2_right] keyboard[1,scan0] or keyboard[0,d]
input_map[p2_left] keyboard[1,scan0] or keyboard[0,a]
input_map[p2_button1] keyboard[1,scan0] or keyboard[0,r]
input_map[p2_button2] keyboard[1,scan0] or keyboard[0,t]
input_map[p2_button3] keyboard[1,scan0] or keyboard[0,y]
input_map[p2_button4] keyboard[1,scan0] or keyboard[0,u]
input_map[p2_button5] keyboard[1,scan0] or keyboard[0,r] keyboard[0,t]
input_map[p2_button6] keyboard[1,scan0] or keyboard[0,y] keyboard[0,u]
input_map[p2_button7] keyboard[1,scan0] or keyboard[0,r] keyboard[0,y]
input_map[p2_button8] keyboard[1,scan0] or keyboard[0,t] keyboard[0,u]
input_map[p1_doubleleft_up] keyboard[1,scan0] or keyboard[0,8_pad]
input_map[p1_doubleleft_down] keyboard[1,scan0] or keyboard[0,2_pad]
input_map[p1_doubleleft_right] keyboard[1,scan0] or keyboard[0,6_pad]
input_map[p1_doubleleft_left] keyboard[1,scan0] or keyboard[0,4_pad]
input_map[p1_doubleright_up] keyboard[1,scan0] or keyboard[0,r]
input_map[p1_doubleright_down] keyboard[1,scan0] or keyboard[0,f]
input_map[p1_doubleright_right] keyboard[1,scan0] or keyboard[0,g]
input_map[p1_doubleright_left] keyboard[1,scan0] or keyboard[0,d]
input_map[ui_cancel] keyboard[1,scan0] keyboard[1,scan0] or keyboard[0,1] keyboard[0,2] or keyboard[1,esc] or keyboard[1,scan0]

The available key names are: a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0_pad, 1_pad, 2_pad, 3_pad, 4_pad, 5_pad, 6_pad, 7_pad, 8_pad, 9_pad, f1, f2, f3, f4, f5, f6, f7, f8, f9, f10, f11, f12, esc, backquote, minus, equals, backspace, tab, openbrace, closebrace, enter, semicolon, quote, backslash, less, comma, period, slash, space, insert, del, home, end, pgup, pgdn, left, right, up, down, slash_pad, asterisk_pad, minus_pad, plus_pad, period_pad, enter_pad, prtscr, pause, lshift, rshift, lcontrol, rcontrol, lalt, ralt, lwin, rwin, menu, scrlock, numlock, capslock.

It's a combination of the key names or scan-code, and of the operators `not', `or'. The `and' operator is implicit between consecutive scan-codes.