I have recently upgraded my netbook from Ubuntu 11.04 to 12.04 LTS. Since the upgrade - in fact, possibly since the upgrade to 11.10 - the system no longer registers touchpad taps as mouse clicks (except, bizarrely enough, in a couple of very limited cases). This feature worked perfectly in 11.04, (and before that, in Eeebuntu based on Jaunty,) and I can't get used to working without it. Other advanced touchpad options, like two-finger scrolling, work perfectly.
"Enable mouse clicks with touchpad" is enabled in System Settings. In the GPointing Device Settings GUI, tapping likewise appears enabled. Here is the output of "synclient":
Parameter settings:
LeftEdge = 1775
RightEdge = 5505
TopEdge = 1648
BottomEdge = 4602
FingerLow = 25
FingerHigh = 30
FingerPress = 256
MaxTapTime = 350
MaxTapMove = 350
MaxDoubleTapTime = 180
SingleTapTimeout = 180
ClickTime = 100
FastTaps = 0
EmulateMidButtonTime = 75
EmulateTwoFingerMinZ = 282
EmulateTwoFingerMinW = 7
VertScrollDelta = 110
HorizScrollDelta = 110
VertEdgeScroll = 0
HorizEdgeScroll = 0
CornerCoasting = 0
VertTwoFingerScroll = 1
HorizTwoFingerScroll = 1
MinSpeed = 1
MaxSpeed = 1.75
AccelFactor = 0.0361598
TrackstickSpeed = 40
EdgeMotionMinZ = 30
EdgeMotionMaxZ = 160
EdgeMotionMinSpeed = 1
EdgeMotionMaxSpeed = 442
EdgeMotionUseAlways = 0
TouchpadOff = 0
LockedDrags = 1
LockedDragTimeout = 550
RTCornerButton = 0
RBCornerButton = 0
LTCornerButton = -70
LBCornerButton = 8
TapButton1 = 0
TapButton2 = 0
TapButton3 = 0
ClickFinger1 = 0
ClickFinger2 = 0
ClickFinger3 = 0
CircularScrolling = 0
CircScrollDelta = 0.1
CircScrollTrigger = 0
CircularPad = 0
PalmDetect = 0
PalmMinWidth = 10
PalmMinZ = 200
CoastingSpeed = 20
CoastingFriction = 50
PressureMotionMinZ = 30
PressureMotionMaxZ = 160
PressureMotionMinFactor = 1
PressureMotionMaxFactor = 1
ResolutionDetect = 1
GrabEventDevice = 1
TapAndDragGesture = 1
AreaLeftEdge = 0
AreaRightEdge = 0
AreaTopEdge = 0
AreaBottomEdge = 0
HorizHysteresis = 27
VertHysteresis = 27
ClickPad = 0
Now the bizarre part: "synclient TapButton1=1" has no effect whatsoever. I can set OTHER variables but not TapButton1, TapButton2 or TapButton3.
What's wrong? And how can it be fixed?