Using Kali on Raspberry Pi2 with 7' touch screen - display OK, touch not OK

[Marjorie]

Hello,

So I bought the 7' touch screen that was released recently.
This one: https://www.raspberrypi.org/blog/the...ry-pi-display/

Now I'm trying to make it work with Kali on a Raspberry Pi 2. The display actually works fine, but not the touch part.

The touch screen works perfectly with Raspian Wheezy (provided you run apt-get update + upgrade).
So it's not an issue of weak power supply.

I have searched quite a lot, obviously the touch screen was released very recently and I understand Raspian is the only sanctioned distro with suitable support at this point. But I think there should be a way to use it with Kali. I'm afraid this could involve recompiling the kernel or something.
The question is, what am I missing...

Relevant info: the screen uses the DSI interface.

I can't believe I am the only one
Any clues welcome.

uname -a:

Linux kali 3.18.16-v7 #1 SMP PREEMPT Thu Aug 13 11:35:22 CDT 2015 armv7l GNU/Linux

Output of lsmod:

Module                  Size  Used by
cfg80211              384120  0
rfkill                 16205  1 cfg80211
evdev                   9802  4
snd_soc_bcm2708_i2s     6444  0
snd_soc_pcm512x_i2c     1693  0
regmap_mmio             2965  1 snd_soc_bcm2708_i2s
snd_soc_pcm512x         6356  1 snd_soc_pcm512x_i2c
snd_soc_wm8804          7300  0
snd_soc_tas5713         4968  0
snd_soc_core          135973  4 snd_soc_pcm512x,snd_soc_wm8804,snd_soc_tas5713,snd_soc_bcm2708_i2s
snd_compress            7507  1 snd_soc_core
snd_pcm_dmaengine       3343  1 snd_soc_core
snd_pcm                72539  3 snd_soc_wm8804,snd_soc_core,snd_pcm_dmaengine
snd_timer              17586  1 snd_pcm
regmap_spi              1702  1 snd_soc_wm8804
snd                    50582  4 snd_soc_core,snd_timer,snd_pcm,snd_compress
regmap_i2c              2281  3 snd_soc_wm8804,snd_soc_pcm512x_i2c,snd_soc_tas5713
spi_bcm2708             5133  0
i2c_dev                 5554  0
i2c_bcm2708             4936  0
fuse                   81207  1
ipv6                  330717  18

NB: output of dmesg is attached separately.
PS: yes I've noticed errors with pcm512x in dmesg, I understand they are benign and related to the sound driver... I think.