Public bug reported:
I have Dell Studio 1535 laptop with Alps touchpad. Scrolling in right
part of the touchpad usually works, but sometimes it just does not. When
it is not working, touchpad tab is not shown in mouse configuration tool
in gnome and there is no way to enable the scrolling again. I have to
reboot (sometimes several times) so that the scrolling works again.
Relevant part from Xorg.log.0:
....
(II) config/udev: Adding input device PS/2 ALPS GlidePoint (/dev/input/event14)
(**) PS/2 ALPS GlidePoint: Applying InputClass "evdev pointer catchall"
(**) PS/2 ALPS GlidePoint: always reports core events
(**) PS/2 ALPS GlidePoint: Device: "/dev/input/event14"
(II) PS/2 ALPS GlidePoint: Found 3 mouse buttons
(II) PS/2 ALPS GlidePoint: Found relative axes
(II) PS/2 ALPS GlidePoint: Found x and y relative axes
(II) PS/2 ALPS GlidePoint: Configuring as mouse
(**) PS/2 ALPS GlidePoint: YAxisMapping: buttons 4 and 5
(**) PS/2 ALPS GlidePoint: EmulateWheelButton: 4, EmulateWheelInertia: 10,
EmulateWheelTimeout: 200
(II) XINPUT: Adding extended input device "PS/2 ALPS GlidePoint" (type: MOUSE)
(II) PS/2 ALPS GlidePoint: initialized for relative axes.
(II) config/udev: Adding input device PS/2 ALPS GlidePoint (/dev/input/mouse1)
(II) No input driver/identifier specified (ignoring)
....
** Affects: ubuntu
Importance: Undecided
Status: New
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Scrolling with touchpad sometimes doesn't work
https://bugs.launchpad.net/bugs/586402
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