syndaemon attaches to wrong touchpad

Submitted by Mario Limonciello @mario_limonciello

Assigned to Peter Hutterer @whot

Link to original bug (#101470)

Description

Created attachment 132004

xinput list --long

On many Dell systems the Synaptics touchpad has the capability to run in both PS/2 and I2C modes. When running on a modern kernel, the touchpad will run in I2C mode.

When in I2C mode, the 'psmouse' driver is still loaded however, meaning that there are two input devices on the system. No input flows through the 'psmouse' driver, it's all handled via i2c-hid instead.

Unfortunately, when starting up syndaemon doesn't check which touchpad it's actually attached to. The login in syndaemon just looks for a touchpad that supports the Synaptics touchpad properties and both of them support these. This leads to syndaemon not working properly.

Device 'SynPS/2 Synaptics TouchPad': Device Enabled (142): 1 Coordinate Transformation Matrix (144): 1.000000, 0.000000, 0.000000, 0.000000, 1.000000, 0.000000, 0.000000, 0.000000, 1.000000 Device Accel Profile (273): 1 Device Accel Constant Deceleration (274): 2.500000 Device Accel Adaptive Deceleration (275): 1.000000 Device Accel Velocity Scaling (276): 12.500000 Synaptics Edges (297): 1583, 5359, 1371, 4481 Synaptics Finger (298): 25, 30, 0 Synaptics Tap Time (299): 180 Synaptics Tap Move (300): 250 Synaptics Tap Durations (301): 180, 100, 100 Synaptics ClickPad (302): 1 Synaptics Middle Button Timeout (303): 0 Synaptics Two-Finger Pressure (304): 282 Synaptics Two-Finger Width (305): 7 Synaptics Scrolling Distance (306): -113, -113 Synaptics Edge Scrolling (307): 0, 0, 0 Synaptics Two-Finger Scrolling (308): 1, 1 Synaptics Move Speed (309): 1.000000, 1.750000, 0.035168, 0.000000 Synaptics Off (310): 2 Synaptics Locked Drags (311): 0 Synaptics Locked Drags Timeout (312): 5000 Synaptics Tap Action (313): 2, 3, 0, 0, 1, 3, 0 Synaptics Click Action (314): 1, 3, 0 Synaptics Circular Scrolling (315): 0 Synaptics Circular Scrolling Distance (316): 0.100000 Synaptics Circular Scrolling Trigger (317): 0 Synaptics Circular Pad (318): 0 Synaptics Palm Detection (319): 0 Synaptics Palm Dimensions (320): 10, 200 Synaptics Coasting Speed (321): 20.000000, 50.000000 Synaptics Pressure Motion (322): 30, 160 Synaptics Pressure Motion Factor (323): 1.000000, 1.000000 Synaptics Resolution Detect (324): 1 Synaptics Grab Event Device (325): 0 Synaptics Gestures (326): 1 Synaptics Capabilities (327): 1, 0, 0, 1, 1, 1, 1 Synaptics Pad Resolution (328): 1, 1 Synaptics Area (329): 0, 0, 0, 0 Synaptics Soft Button Areas (330): 3471, 0, 4083, 0, 0, 0, 0, 0 Synaptics Noise Cancellation (331): 28, 28 Device Product ID (260): 2, 7 Device Node (261): "/dev/input/event6"

Device 'DLL0704:01 06CB:76AE Touchpad': Device Enabled (142): 1 Coordinate Transformation Matrix (144): 1.000000, 0.000000, 0.000000, 0.000000, 1.000000, 0.000000, 0.000000, 0.000000, 1.000000 Device Accel Profile (273): 1 Device Accel Constant Deceleration (274): 2.500000 Device Accel Adaptive Deceleration (275): 1.000000 Device Accel Velocity Scaling (276): 12.500000 Synaptics Edges (297): 48, 1168, 36, 644 Synaptics Finger (298): 25, 30, 0 Synaptics Tap Time (299): 180 Synaptics Tap Move (300): 61 Synaptics Tap Durations (301): 180, 100, 100 Synaptics ClickPad (302): 1 Synaptics Middle Button Timeout (303): 0 Synaptics Two-Finger Pressure (304): 282 Synaptics Two-Finger Width (305): 7 Synaptics Scrolling Distance (306): -27, -27 Synaptics Edge Scrolling (307): 0, 0, 0 Synaptics Two-Finger Scrolling (308): 1, 1 Synaptics Move Speed (309): 1.000000, 1.750000, 0.143575, 0.000000 Synaptics Off (310): 0 Synaptics Locked Drags (311): 0 Synaptics Locked Drags Timeout (312): 5000 Synaptics Tap Action (313): 2, 3, 0, 0, 1, 3, 0 Synaptics Click Action (314): 1, 3, 0 Synaptics Circular Scrolling (315): 0 Synaptics Circular Scrolling Distance (316): 0.100000 Synaptics Circular Scrolling Trigger (317): 0 Synaptics Circular Pad (318): 0 Synaptics Palm Detection (319): 0 Synaptics Palm Dimensions (320): 10, 200 Synaptics Coasting Speed (321): 20.000000, 50.000000 Synaptics Pressure Motion (322): 30, 160 Synaptics Pressure Motion Factor (323): 1.000000, 1.000000 Synaptics Resolution Detect (324): 1 Synaptics Grab Event Device (325): 0 Synaptics Gestures (326): 1 Synaptics Capabilities (327): 1, 0, 0, 1, 1, 0, 0 Synaptics Pad Resolution (328): 12, 12 Synaptics Area (329): 0, 0, 0, 0 Synaptics Soft Button Areas (330): 608, 0, 557, 0, 0, 0, 0, 0 Synaptics Noise Cancellation (331): 6, 6 Device Product ID (260): 1739, 30382 Device Node (261): "/dev/input/event15"

Attachment 132004, "# xinput list --long":
xinput_list_long.txt