I read a suggestion elsewhere to add the options

i8042.reset i8042.nomux=1

to the kernel. The touchpad is now detected:

[   48.284121] Synaptics Touchpad, model: 1, fw: 6.3, id: 0x12a0b1, caps: 
0xa04711/0xa04000/0x0
[   48.345409] input: SynPS/2 Synaptics TouchPad as 
/devices/platform/i8042/serio1/input/input6

xinput list

now lists the touchpad:

⎡ Virtual core pointer                          id=2    [master pointer  (3)]
⎜   ↳ Virtual core XTEST pointer                id=4    [slave  pointer  (2)]
⎜   ↳ SynPS/2 Synaptics TouchPad                id=11   [slave  pointer  (2)]
⎜   ↳ Microsoft Comfort Optical Mouse 1000      id=9    [slave  pointer  (2)]
⎣ Virtual core keyboard                         id=3    [master keyboard (2)]
    ↳ Virtual core XTEST keyboard               id=5    [slave  keyboard (3)]
    ↳ Power Button                              id=6    [slave  keyboard (3)]
    ↳ Video Bus                                 id=7    [slave  keyboard (3)]
    ↳ Sleep Button                              id=8    [slave  keyboard (3)]
    ↳ AT Translated Set 2 keyboard              id=10   [slave  keyboard (3)]

evtest /dev/input/event6

still produces no output

-- 
touchpad not working on fujitsu-siemens esprimo mobile V6505
https://bugs.launchpad.net/bugs/671692
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