I'm using an HP detachable laptop, everything works fine, except touchscreen and audio; this PC has a synaptic digitizer which is detected but is not working, nor Ubuntu's driver tool seems to find nothing to install. I'm running Xubuntu (Ubuntu 16.04 xenial); Strange thing to mention: during live boot everything was fine, audio and touchscreen too. Using xinput list --name-only :

Virtual core pointer
Virtual core XTEST pointer
SYNA7508:00 06CB:1613 Pen
SYNA7508:00 06CB:1613
HID 04f3:074d
Virtual core keyboard
Virtual core XTEST keyboard
Power button
Video bus
Power button
axp20x-pek
HP WMI hotkeys
HID 04f3:074d

showing 2 synaptic devices, one for pen detection and one for normal use, but none of them works. dmesg showed me some error that i can't understand (I'm writing only interested lines:

12c_hid i2c-SYNA7508:00: i2c-SYNA7508:00 supply vdd not found, using dummy regulator

and later:

input: SYNA7508:00 06CB:1613 Pen as /devices/pci0000:00/808622C1:05/i2c-5/i2c-SYNA7508:00/0018:06C:1613.0001/input/input11
input: SYNA7508:00 06CB:1613 as /devices/pci0000:00/808622C1:05/i2c-5/i2c-SYNA7508:00/0018:06C:1613.0001/input/input12
hid-multitouch 0018:06CB:1613.0001: input,hidraw2: 12C HID v1.00 Device [SYNA7508:00 06CB:1613] on i2c-SYNA7508:00

Someone has an idea to fix the touchscreen?

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