Comment 75 for bug 1581088

Same problem for me today. Middle button was working one moment, not working the next. Xubuntu 14.04. Didn't update any packages or anything. Mouse is a Logitech M310 that I've had for years. A Dell USB wired mouse (shows up in xinput as "PixArt") works just fine. xev shows no events whatsoever from the middle click, but correctly registers every other mouse event. Was hoping a reboot would fix, but no such luck. It's not just middle-click that's stopped working; it's all middle-click functionality. xinput properties on the two mice look identical where third-button behavior is involved:

Device 'PixArt USB Optical Mouse':
 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 (269): 0
 Device Accel Constant Deceleration (270): 1.000000
 Device Accel Adaptive Deceleration (271): 1.000000
 Device Accel Velocity Scaling (272): 10.000000
 Device Product ID (258): 1121, 20002
 Device Node (259): "/dev/input/event11"
 Evdev Axis Inversion (273): 0, 0
 Evdev Axes Swap (275): 0
 Axis Labels (276): "Rel X" (152), "Rel Y" (153), "Rel Vert Wheel" (268)
 Button Labels (277): "Button Left" (145), "Button Middle" (146), "Button Right" (147), "Button Wheel Up" (148), "Button Wheel Down" (149), "Button Horiz Wheel Left" (150), "Button Horiz Wheel Right" (151), "Button Side" (262), "Button Extra" (263), "Button Forward" (264), "Button Back" (265), "Button Task" (266), "Button Unknown" (261), "Button Unknown" (261), "Button Unknown" (261), "Button Unknown" (261)
 Evdev Middle Button Emulation (278): 0
 Evdev Middle Button Timeout (279): 50
 Evdev Third Button Emulation (280): 0
 Evdev Third Button Emulation Timeout (281): 1000
 Evdev Third Button Emulation Button (282): 3
 Evdev Third Button Emulation Threshold (283): 20
 Evdev Wheel Emulation (284): 0
 Evdev Wheel Emulation Axes (285): 0, 0, 4, 5
 Evdev Wheel Emulation Inertia (286): 10
 Evdev Wheel Emulation Timeout (287): 200
 Evdev Wheel Emulation Button (288): 4
 Evdev Drag Lock Buttons (289): 0

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Device 'Logitech M310':
 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 (269): 0
 Device Accel Constant Deceleration (270): 1.000000
 Device Accel Adaptive Deceleration (271): 1.000000
 Device Accel Velocity Scaling (272): 10.000000
 Device Product ID (258): 1133, 4132
 Device Node (259): "/dev/input/event7"
 Evdev Axis Inversion (273): 0, 0
 Evdev Axes Swap (275): 0
 Axis Labels (276): "Rel X" (152), "Rel Y" (153), "Rel Horiz Wheel" (267), "Rel Vert Wheel" (268)
 Button Labels (277): "Button Left" (145), "Button Middle" (146), "Button Right" (147), "Button Wheel Up" (148), "Button Wheel Down" (149), "Button Horiz Wheel Left" (150), "Button Horiz Wheel Right" (151), "Button Side" (262), "Button Extra" (263), "Button Forward" (264), "Button Back" (265), "Button Task" (266), "Button Unknown" (261), "Button Unknown" (261), "Button Unknown" (261), "Button Unknown" (261), "Button Unknown" (261), "Button Unknown" (261), "Button Unknown" (261), "Button Unknown" (261), "Button Unknown" (261), "Button Unknown" (261), "Button Unknown" (261), "Button Unknown" (261)
 Evdev Middle Button Emulation (278): 0
 Evdev Middle Button Timeout (279): 50
 Evdev Third Button Emulation (280): 0
 Evdev Third Button Emulation Timeout (281): 1000
 Evdev Third Button Emulation Button (282): 3
 Evdev Third Button Emulation Threshold (283): 20
 Evdev Wheel Emulation (284): 0
 Evdev Wheel Emulation Axes (285): 0, 0, 4, 5
 Evdev Wheel Emulation Inertia (286): 10
 Evdev Wheel Emulation Timeout (287): 200
 Evdev Wheel Emulation Button (288): 4
 Evdev Drag Lock Buttons (289): 0

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Not sure what else I can do to help debug this. If anyone has suggestions, I'll try them.