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    SubjectRe: 2.6.11: touchpad unresponsive
    On Wed, 2 Mar 2005 12:12:53 -0500, Dmitry Torokhov <dmitry.torokhov@gmail.com> wrote:

    > > Booting X in new kernel makes my touchpad very unresponsive. I can't
    > > click any longer in the touchpad area, and the touchpad doesn't response
    > > when moving in small increments, so the whole experience is quite bad.

    > If it is identified as an ALPS touchpad you can try installing Peter
    > Osterlund's Synaptics X driver:
    >
    > http://web.telia.com/~u89404340/touchpad/

    Not a bad idea but I suspect it may be simpler to use the attached patch
    instead (written by Peter, actually).

    -- Pete

    diff -urp -X dontdiff linux-2.6.11-rc4/drivers/input/mousedev.c linux-2.6.11-rc4-lem/drivers/input/mousedev.c
    --- linux-2.6.11-rc4/drivers/input/mousedev.c 2005-02-15 22:38:39.000000000 -0800
    +++ linux-2.6.11-rc4-lem/drivers/input/mousedev.c 2005-02-15 22:54:35.000000000 -0800
    @@ -71,6 +71,7 @@ struct mousedev {
    struct mousedev_hw_data packet;
    unsigned int pkt_count;
    int old_x[4], old_y[4];
    + int frac_dx, frac_dy;
    unsigned long touch;
    };

    @@ -117,24 +118,31 @@ static struct mousedev mousedev_mix;

    static void mousedev_touchpad_event(struct input_dev *dev, struct mousedev *mousedev, unsigned int code, int value)
    {
    - int size;
    + int size, tmp;
    + enum { FRACTION_DENOM = 100 };

    if (mousedev->touch) {
    + size = dev->absmax[ABS_X] - dev->absmin[ABS_X];
    + if (size == 0) size = xres;
    switch (code) {
    case ABS_X:
    - size = dev->absmax[ABS_X] - dev->absmin[ABS_X];
    - if (size == 0) size = xres;
    fx(0) = value;
    - if (mousedev->pkt_count >= 2)
    - mousedev->packet.dx = ((fx(0) - fx(1)) / 2 + (fx(1) - fx(2)) / 2) * xres / (size * 2);
    + if (mousedev->pkt_count >= 2) {
    + tmp = ((value - fx(2)) * (250 * FRACTION_DENOM)) / size;
    + tmp += mousedev->frac_dx;
    + mousedev->packet.dx = tmp / FRACTION_DENOM;
    + mousedev->frac_dx = tmp - mousedev->packet.dx * FRACTION_DENOM;
    + }
    break;

    case ABS_Y:
    - size = dev->absmax[ABS_Y] - dev->absmin[ABS_Y];
    - if (size == 0) size = yres;
    fy(0) = value;
    - if (mousedev->pkt_count >= 2)
    - mousedev->packet.dy = -((fy(0) - fy(1)) / 2 + (fy(1) - fy(2)) / 2) * yres / (size * 2);
    + if (mousedev->pkt_count >= 2) {
    + tmp = ((fy(2) - value) * (250 * FRACTION_DENOM)) / size;
    + tmp += mousedev->frac_dy;
    + mousedev->packet.dy = tmp / FRACTION_DENOM;
    + mousedev->frac_dy = tmp - mousedev->packet.dy * FRACTION_DENOM;
    + }
    break;
    }
    }
    @@ -268,6 +276,8 @@ static void mousedev_touchpad_touch(stru
    clear_bit(0, &mousedev_mix.packet.buttons);
    }
    mousedev->touch = mousedev->pkt_count = 0;
    + mousedev->frac_dx = 0;
    + mousedev->frac_dy = 0;
    }
    else
    if (!mousedev->touch)
    -
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