update on touchpad problems

Bryan Berry bryan.berry at gmail.com
Tue May 20 04:57:36 EDT 2008

sorry been out of contact on this issue and haven't responded earlier.

The monsoon started last week so there is a lot less dust at Bashuki
school. The touchpad problem has reduced to a point that about 3 out of
27 kids have touchpad problems at one time, down from 50%

I still need to test this problem out more thoroughly, but my higher
priority for Sulochan and I right now is getting an E-Library online w/
Nepali kids' literature. It should be live and Internet-accessible by
July 15th, will write later the tools we are using for it. 

thanks for the help guys and sorry didn't write back sooner. 

OLE Nepal

On Thu, 2008-05-08 at 23:57 -0400, Michael Stone wrote:
> Dear devel@,
> We can use Xkb/AccessX's "MouseKeys" accessibility feature to provide an
> easy work-around for many of our touchpad problems. MouseKeys is easy to
> enable through xmodmap where, (on a handy B4), you do something like:
>   xmodmap -pke > old_map
>   xmodmap -e 'keycode 133 = Num_Lock Pointer_EnableKeys'
>   xmodmap -e 'keycode 111 = Up KP_Up'
>   xmodmap -e 'keycode 116 = Down KP_Down'
>   xmodmap -e 'keycode 113 = Left KP_Left'
>   xmodmap -e 'keycode 114 = Right KP_Right'
>   xmodmap -e 'keycode 36 = Return KP_Begin'
> Your keycodes may vary; I figured out the right ones by using xev and
> pressing the appropriate buttons. I figured out the keysyms mainly by
> reading the xmodmap -pke output. (The Wiki scan codes diagram [1] and
> table [2] were not accurate for my machine according to xev.)
>   [1]: http://wiki.laptop.org/go/OLPC_Keyboard_layouts 
>   [2]: http://wiki.laptop.org/go/Scan_code_table
> At any rate, after you perform this remapping, MouseKeys can be turned
> on by pressing 'Shift-LeftGrabby' and can be used by holding Shift and
> pressing arrow keys (or Shift-Enter to click). All this works great
> except for the fact that the resulting mouse motion is very slow (being
> capped at 30 px/sec in the default MouseKeys configuration.)
> To address this, I wrote a small 'mkspeed' which is available in source
> form at
>   http://dev.laptop.org/git/users/mstone/mkspeed
> The relevant code is 
>   http://dev.laptop.org/git?p=users/mstone/mkspeed;a=blob;f=mkspeed.c;hb=HEAD
> Unfortunately, it doesn't work and I can't tell why. (This is my first
> Xkb program.) Consequently, help would be greatly appreciated. If you're
> interested, reference documentation is available [3]; see sections 4.5,
> 4.6, and 16.3.5 for the important details.
>   [3]: http://www.xfree86.org/current/XKBproto.pdf
> Alternately, if mkspeed proves to be difficult to complete, we can
> probably just raise the default speed limit in the Xkb implementation in
> the X server.
> Michael
> P.S. - If you know some nice Xkb folks who might like to help out, feel
> free to forward this email to them. Or tell me why I'm an idiot and why
> this is a terrible way to work around the jumpy touchpad bugs.
> P.P.S. - Eben - you might start thinking about how we should actually be
> exposing this sort of feature in the UI.

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