Newest version 1.3.99+git20110116.0e27ce3a-0ubuntu1 makes touchpad useless..

Where are you getting the package from?

from the natty sources. I have natty alpha 1 installed. (no virtual machine)
I installed all new updates and this package was also installed. it does not work for my touchpad
(1.3.99+git20110116.0e27ce3a-0ubuntu1)

In order to get the touchpad working again, I manually installed xserver-xorg-input-synaptics_1.2.2-2ubuntu5_i386..

You are using a PRE-RELEASE. What did you expect.

log a bug.

Natty is NOT ready and NOT stable. If you want a half-ass OS with
function holes and bugs which you can then log to improve the OS then
use Natty. If you want an OS that works then install Maverick or Lucid.

i wanted to tell the problem, not to complain about it. I know that natty is pre-release :)
I didnt know how and what to post in bug list, because I get no error messages in my log files, touchpad is simply not working right anymore.

try providing the output of the following from a command line

lspci
lsusb
uname -a
lsmod

also, after installing (man git version numbering sucks)
1.3.99+git20110116.0e27ce3a-ubuntu1

try

sudo udevadm trigger

see if that magically makes it "work"

lspci
=====
00:00.0 Host bridge: Intel Corporation Mobile 4 Series Chipset Memory Controller Hub (rev 07)
00:02.0 VGA compatible controller: Intel Corporation Mobile 4 Series Chipset Integrated Graphics Controller (rev 07)
00:02.1 Display controller: Intel Corporation Mobile 4 Series Chipset Integrated Graphics Controller (rev 07)
00:1a.0 USB Controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #4 (rev 03)
00:1a.1 USB Controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #5 (rev 03)
00:1a.7 USB Controller: Intel Corporation 82801I (ICH9 Family) USB2 EHCI Controller #2 (rev 03)
00:1b.0 Audio device: Intel Corporation 82801I (ICH9 Family) HD Audio Controller (rev 03)
00:1c.0 PCI bridge: Intel Corporation 82801I (ICH9 Family) PCI Express Port 1 (rev 03)
00:1c.3 PCI bridge: Intel Corporation 82801I (ICH9 Family) PCI Express Port 4 (rev 03)
00:1d.0 USB Controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #1 (rev 03)
00:1d.1 USB Controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #2 (rev 03)
00:1d.2 USB Controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #3 (rev 03)
00:1d.7 USB Controller: Intel Corporation 82801I (ICH9 Family) USB2 EHCI Controller #1 (rev 03)
00:1e.0 PCI bridge: Intel Corporation 82801 Mobile PCI Bridge (rev 93)
00:1f.0 ISA bridge: Intel Corporation ICH9M-E LPC Interface Controller (rev 03)
00:1f.2 SATA controller: Intel Corporation ICH9M/M-E SATA AHCI Controller (rev 03)
00:1f.3 SMBus: Intel Corporation 82801I (ICH9 Family) SMBus Controller (rev 03)
01:00.0 Ethernet controller: Atheros Communications AR8131 Gigabit Ethernet (rev c0)
02:00.0 Network controller: Intel Corporation Centrino Wireless-N 1000

lsusb
=====
Bus 007 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 006 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 004 Device 002: ID 2087:0b03
Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 002: ID 04f2:b175 Chicony Electronics Co., Ltd
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

uname -a
========
Linux 2.6.37-12-generic #26-Ubuntu SMP Wed Jan 5 18:42:49 UTC 2011 i686 i686 i386 GNU/Linux

lsmod
=====
Module Size Used by
aes_i586 16956 0
aes_generic 38023 1 aes_i586
parport_pc 32111 0
ppdev 12849 0
snd_hda_codec_hdmi 27225 1
snd_hda_codec_realtek 255700 1
binfmt_misc 13213 1
snd_hda_intel 24140 2
snd_hda_codec 90901 3 snd_hda_codec_hdmi,snd_hda_codec_realtek,snd_hda_intel
snd_hwdep 13274 1 snd_hda_codec
arc4 12473 2
snd_pcm 80274 2 snd_hda_intel,snd_hda_codec
iwlagn 280166 0
snd_seq_midi 13132 0
i915 393710 2
joydev 17322 0
snd_rawmidi 25301 1 snd_seq_midi
iwlcore 138295 1 iwlagn
mac80211 246296 2 iwlagn,iwlcore
snd_seq_midi_event 14475 1 snd_seq_midi
drm_kms_helper 40746 1 i915
snd_seq 51303 2 snd_seq_midi,snd_seq_midi_event
drm 182215 3 i915,drm_kms_helper
cfg80211 146707 3 iwlagn,iwlcore,mac80211
snd_timer 28689 2 snd_pcm,snd_seq
snd_seq_device 14110 3 snd_seq_midi,snd_rawmidi,snd_seq
i2c_algo_bit 13150 1 i915
snd 55129 14 snd_hda_codec_hdmi,snd_hda_codec_realtek,snd_hda_intel,snd_hda_codec,snd_hwdep,snd_pcm,snd_rawmidi,snd_seq,snd_timer,snd_seq_device
hid_cando 12719 0
soundcore 12600 1 snd
video 18975 1 i915
shpchp 32345 0
psmouse 64260 0
snd_page_alloc 14073 2 snd_hda_intel,snd_pcm
serio_raw 12990 0
output 12999 1 video
lp 13349 0
parport 36746 3 parport_pc,ppdev,lp
usbhid 45936 0
hid 76993 2 hid_cando,usbhid
ahci 21591 2
libahci 25249 1 ahci
atl1c 36275 0
btrfs 517268 1
zlib_deflate 26594 1 btrfs
libcrc32c 12543 1 btrfs

@mycae
sudo udevadm trigger
does not work when 1.3.99 is installed