[arch-general] Alps touchpad problems

[Paul Gideon Dann]

Hi Mike,

I have a Latitude E5520, and I suspect we have the same touchpad.

This is the Kernel bug you'll be interested in:
https://bugzilla.kernel.org/show_bug.cgi?id=14660

This is the patch I've been using to add support for my touchpad to the kernel 
for the past few releases:
http://giddie.homeip.net/alps.patch

If you want it, here is a pre-built 64-bit kernel module:
http://giddie.homeip.net/psmouse.ko

You can keep it anywhere you want, and just "rmmod psmouse", and "insmod 
psmouse.ko".  I'm pretty sure this will do the trick for you.

Paul


On Thursday 09 Feb 2012 19:39:53 mike cloaked wrote:
> I am trying to get a laptop touchpad working properly with arch fully
> up to date as of today. The machine is a recent Dell Vostro and has an
> Alps touchpad. I can't get vertical scrolling to work in KDE, and the
> mouse cursor occasionally moves erratically.
> 
> I have seen previous posts some time back recommending installing the
> psmouse-alps package from AUR, and indeed it would appear that the 3.3
> kernel may have a working psmouse module. However for the moment with
> kernel 3.2.5 the touchpad is detected as P/S 2 Generic - instead of
> the correct detection.
> 
> I have tried installing psmouse-alps and rebooting but it made no
> difference so I uninstalled it again.
> 
> the Xorg log has:
> 
> [    16.850] (II) config/udev: Adding input device PS/2 Generic Mouse
> (/dev/inpu t/event8)
> [    16.850] (**) PS/2 Generic Mouse: Applying InputClass "evdev pointer
> catchal l"
> [    16.850] (II) Using input driver 'evdev' for 'PS/2 Generic Mouse'
> [    16.850] (II) Loading /usr/lib/xorg/modules/input/evdev_drv.so
> [    16.850] (**) PS/2 Generic Mouse: always reports core events
> [    16.850] (**) PS/2 Generic Mouse: Device: "/dev/input/event8"
> [    16.850] (--) PS/2 Generic Mouse: Found 3 mouse buttons
> [    16.850] (--) PS/2 Generic Mouse: Found relative axes
> [    16.850] (--) PS/2 Generic Mouse: Found x and y relative axes
> [    16.850] (II) PS/2 Generic Mouse: Configuring as mouse
> [    16.850] (**) PS/2 Generic Mouse: YAxisMapping: buttons 4 and 5
> [    16.850] (**) PS/2 Generic Mouse: EmulateWheelButton: 4,
> EmulateWheelInertia: 10, EmulateWheelTimeout: 200
> [    16.850] (**) Option "config_info"
> "udev:/sys/devices/platform/i8042/serio1/input/input8/event8"
> [    16.850] (II) XINPUT: Adding extended input device "PS/2 Generic
> Mouse" (type: MOUSE, id 12)
> [    16.850] (II) PS/2 Generic Mouse: initialized for relative axes.
> [    16.850] (**) PS/2 Generic Mouse: (accel) keeping acceleration scheme 1
> [    16.850] (**) PS/2 Generic Mouse: (accel) acceleration profile 0
> [    16.851] (**) PS/2 Generic Mouse: (accel) acceleration factor: 2.000
> [    16.851] (**) PS/2 Generic Mouse: (accel) acceleration threshold: 4
> [    16.851] (II) config/udev: Adding input device PS/2 Generic Mouse
> (/dev/input/mouse0)
> [    16.851] (II) No input driver specified, ignoring this device.
> [    16.851] (II) This device may have been added with another device file.
> 
> Does anyone have current experience with this issue and know the best
> way to work around the problem until the 3.3 kernel is released?
> 
> Thanks