Comment 25 for bug 1338973

Exact same issue on a macbook air 11" with kubuntu 14.04 (kcm 0.99)

xinput list-props 11
Device 'bcm5974':
        Device Enabled (135): 1
        Coordinate Transformation Matrix (137): 1.000000, 0.000000, 0.000000, 0.000000, 1.000000, 0.000000, 0.000000, 0.000000, 1.000000
        Device Accel Profile (265): 1
        Device Accel Constant Deceleration (266): 2.500000
        Device Accel Adaptive Deceleration (267): 1.000000
        Device Accel Velocity Scaling (268): 12.500000
        Synaptics Edges (269): -3791, 4311, 423, 6027
        Synaptics Finger (270): 70, 75, 0
        Synaptics Tap Time (271): 180
        Synaptics Tap Move (272): 20
        Synaptics Tap Durations (273): 180, 180, 100
        Synaptics ClickPad (274): 1
        Synaptics Middle Button Timeout (275): 0
        Synaptics Two-Finger Pressure (276): 283
        Synaptics Two-Finger Width (277): 7
        Synaptics Scrolling Distance (278): 10, 10
        Synaptics Edge Scrolling (279): 1, 0, 0
        Synaptics Two-Finger Scrolling (280): 1, 0
        Synaptics Move Speed (281): 1.000000, 1.750000, 0.016855, 0.000000
        Synaptics Off (282): 2
        Synaptics Locked Drags (283): 0
        Synaptics Locked Drags Timeout (284): 5000
        Synaptics Tap Action (285): 2, 3, 0, 0, 1, 3, 0
        Synaptics Click Action (286): 1, 3, 0
        Synaptics Circular Scrolling (287): 0
        Synaptics Circular Scrolling Distance (288): 0.100007
        Synaptics Circular Scrolling Trigger (289): 0
        Synaptics Circular Pad (290): 0
        Synaptics Palm Detection (291): 0
        Synaptics Palm Dimensions (292): 10, 200
        Synaptics Coasting Speed (293): 248.880005, 44.619999
        Synaptics Pressure Motion (294): 30, 160
        Synaptics Pressure Motion Factor (295): 1.000000, 1.000000
        Synaptics Resolution Detect (296): 1
        Synaptics Grab Event Device (297): 1
        Synaptics Gestures (298): 1
        Synaptics Capabilities (299): 1, 0, 0, 1, 1, 1, 1
        Synaptics Pad Resolution (300): 1, 1
        Synaptics Area (301): 0, 0, 0, 0
        Synaptics Soft Button Areas (302): 0, 0, 0, 0, 0, 0, 0, 0
        Synaptics Noise Cancellation (303): 39, 27
        Device Product ID (255): 1452, 656
        Device Node (256): "/dev/input/event8"

It is quite anoying because even with 10mm the scrolling is *way* too fast.
What should I test/compile??