Hi,

I have a Dell Inspiron 15-5547 with a Synaptics clickpad. Starting with
4.11.x kernels (and up to 4.12-rc6) the touchpad no longer reports
physical clicks, and `lsinput -vv` doesn't even show BTN_LEFT on it.

Everything else (taps, multitouch) seems to work fine. As far as I can
tell, all the kernel config options are enabled, the same modules are
loaded, it's being detected as a RMI touchpad in both cases (although
apparently a different version or something?)

[dmesg - 4.10.13 good]

hid-rmi 0018:06CB:2934.0001: Scanning PDT...
hid-rmi 0018:06CB:2934.0001: Found F34 on page 0x00
hid-rmi 0018:06CB:2934.0001: Found F01 on page 0x00
hid-rmi 0018:06CB:2934.0001: Found F11 on page 0x00
hid-rmi 0018:06CB:2934.0001: Found F54 on page 0x01
hid-rmi 0018:06CB:2934.0001: Found F30 on page 0x01
hid-rmi 0018:06CB:2934.0001: Found F55 on page 0x02
hid-rmi 0018:06CB:2934.0001: rmi_scan_pdt: Done with PDT scan.
hid-rmi 0018:06CB:2934.0001: rmi_populate_f11: size in mm: 102 x 77
hid-rmi 0018:06CB:2934.0001: firmware id: 1541093
input: DLL063E:00 06CB:2934 as /devices/pci0000:00/INT33C3:00/i2c-8/i2c-DLL063E:00/0018:06CB:2934.0001/input/input14
hid-rmi 0018:06CB:2934.0001: input,hidraw0: I2C HID v1.00 Pointer [DLL063E:00 06CB:2934] on i2c-DLL063E:00

[dmesg - 4.12-rc6 bad]

rmi4_f01 rmi4-00.fn01: found RMI device, manufacturer: Synaptics, product: s3203, fw id: 1541093
input: Synaptics s3203 as /devices/pci0000:00/INT33C3:00/i2c-8/i2c-DLL063E:00/0018:06CB:2934.0001/input/input16
hid-rmi 0018:06CB:2934.0001: input,hidraw0: I2C HID v1.00 Pointer [DLL063E:00 06CB:2934] on i2c-DLL063E:00

-- 
Mantas Mikulėnas [off-list ref]