confirm that single touch works with usbhid.quirks=0xeef:0x7356:0x40 appended 
to kernel.
I read the thread and something is bugging me, what exactly is 
"usbhid.quirks=0xeef:0x7356:0x40" standing for, because I tried to build a 
custom kernel, and everything works well with this appended as kernel 
parameters, but I also built some modules for handling egalax touchscreen.
It appears in 3.0-rc7 that hid-egalax was merged into hid-multitouch and it 
seems that this modules doesn't handle my egalax (0eef:7356 on a dell latitude 
e6420).
I can't figure out what module exactly handles it because removing the kernel 
parameters, the touchscreen jump to the top left corner at any single touch on 
the screen.
the only modules loaded at boot time by system are : 


Module                  Size  Used by
ntfs                  194422  0 
ppdev                  16782  0 
lp                     17074  0 
cpufreq_userspace      12576  0 
cpufreq_conservative    13105  0 
acpi_cpufreq           12893  1 
mperf                  12411  1 acpi_cpufreq
rfcomm                 40999  8 
cpufreq_stats          12777  0 
bnep                   17470  2 
cpufreq_powersave      12454  0 
binfmt_misc            16949  1 
uinput                 17360  1 
nfsd                  303385  13 
exportfs               12567  1 nfsd
loop                   26506  0 
nvidia              11769525  43 
iwlagn                189164  0 
uvcvideo               69970  0 
btusb                  17289  2 
parport_pc             26287  0 
battery                13109  0 
button                 12937  0 
ac                     12624  0 
video                  17629  0 
processor              27965  9 acpi_cpufreq
i2c_i801               16891  0 
psmouse                63288  0 
tpm_tis                17265  0 
ext4                  373903  9 
mbcache                12985  1 ext4
jbd2                   77208  1 ext4
sg                     29895  0 
usb_storage            47847  0 
sr_mod                 21855  0 
uas                    17272  0 
cdrom                  39472  1 sr_mod
sd_mod                 43854  4 
thermal                17383  0 


I had a look on hid-multitouch.c and i couldn't figure out why without the 
kernel parameter, the touchscreen had the same behaviour whereas it seems the 
probleme was partially solved and the routines in the source handle events 
quiet differently.

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https://bugs.launchpad.net/bugs/625511

Title:
  Obsolete quirk prevents multitouch module for eGalax touchscreen from
  working

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