The Middle button on Synaptics touchpad should scroll, but it doesn't in my case. Here is the output of "xinput list" command:
Device 'SynPS/2 Synaptics TouchPad':
Device Enabled (117): 1
Coordinate Transformation Matrix (119): 1.000000, 0.000000, 0.000000, 0.000000, 1.000000, 0.000000, 0.000000, 0.000000, 1.000000
Device Accel Profile (242): 1
Device Accel Constant Deceleration (243): 2.500000
Device Accel Adaptive Deceleration (244): 1.000000
Device Accel Velocity Scaling (245): 12.500000
Synaptics Edges (246): 1752, 5192, 1620, 4236
Synaptics Finger (247): 25, 30, 256
Synaptics Tap Time (248): 180
Synaptics Tap Move (249): 323
Synaptics Tap Durations (250): 180, 180, 100
Synaptics ClickPad (251): 0
Synaptics Tap FastTap (252): 0
Synaptics Middle Button Timeout (253): 75
Synaptics Two-Finger Pressure (254): 282
Synaptics Two-Finger Width (255): 7
Synaptics Scrolling Distance (256): 99, 200
Synaptics Edge Scrolling (257): 1, 1, 0
Synaptics Two-Finger Scrolling (258): 0, 0
Synaptics Move Speed (259): 1.000000, 1.750000, 0.039809, 40.000000
Synaptics Edge Motion Pressure (260): 30, 160
Synaptics Edge Motion Speed (261): 1, 401
Synaptics Edge Motion Always (262): 0
Synaptics Button Scrolling (263): 1, 1
Synaptics Button Scrolling Repeat (264): 1, 1
Synaptics Button Scrolling Time (265): 100
Synaptics Off (266): 0
Synaptics Locked Drags (267): 0
Synaptics Locked Drags Timeout (268): 5000
Synaptics Tap Action (269): 2, 3, 0, 0, 1, 3, 0
Synaptics Click Action (270): 1, 1, 0
Synaptics Circular Scrolling (271): 0
Synaptics Circular Scrolling Distance (272): 0.100000
Synaptics Circular Scrolling Trigger (273): 0
Synaptics Circular Pad (274): 0
Synaptics Palm Detection (275): 0
Synaptics Palm Dimensions (276): 10, 200
Synaptics Coasting Speed (277): 20.000000, 50.000000
Synaptics Pressure Motion (278): ... of unknown type CARDINAL
Synaptics Pressure Motion Factor (279): 1.000000, 1.000000
Synaptics Resolution Detect (280): 1
Synaptics Grab Event Device (281): 1
Synaptics Gestures (282): 1
Synaptics Capabilities (283): 1, 0, 1, 0, 0, 1, 1
Synaptics Pad Resolution (284): 109, 59
Synaptics Area (285): 0, 0, 0, 0
Synaptics Noise Cancellation (286): 25, 25
Device Product ID (237): 2, 7
Device Node (238): "/dev/input/event6"
Playing with settings 253 and 265 gave no success. The setting Synaptics Button Scrolling Repeat (264): 1, 1 doesn't affect anything. When I press the middle button, scroll is performed only once and isn't repeated. The driver version is 1.5.99.902.
UPD. The problem was in compiz settings (I changed the following settings: sync to VBlank is off, sync with refresh rate is off, compiz ping delay is 2000).
