Je ne resiste pas à l'idée de vous faire lire la partie du manuel de XF86Config concernant les tablettes SummaSketch.
The SummaSketch subsection support the following entries:
Port "path"
sets the path to the special file which
represents the device driver.
DeviceName "name"
sets the name of the X device.
Mode Relative|Absolute
sets the mode of the device.
Cursor Stylus|Puck
sets the cursor type, stylus or 4 button puck.
Increment value
sets the minimum change in coordinates before
new report.
HistorySize number
sets the motion history size. By default the
value is zero.
Compatible
prevents the driver from asking the firmware
id of the tablet to enable some compatible
tablet to work (like the Numonics GridMaster).
AlwaysCore
enables the sharing of the core pointer. When
this feature is enabled, the device will take
control of the core pointer (and thus will
emit core events) and at the same time will be
able, when asked so, to report extended
events. You can use the last available inte
ger feedback to control this feature. When the
value of the feedback is zero, the feature is
disabled. The feature is enabled for any other
value.
Resolution value
Sets tablet resolution. Choose a value from
below:
lpi: 1 2 4 100 200 254 400 500 508 1000
1016
2000 2032 2540
lpmm: 10 20 40
Any other value, or if this option is not pro
vided, will default to 500 lpi. Note that
"2540 lpi" is only available for the SummaS
ketch 12x12 tablet, and the Summa MM mode can
restrict reported maximum coordinate value to
be 16384, which means the higher the resolu
tion, the smaller the usable tablet surface.
ActiveOffset x y
Where "x y" are in units of inches, to two
decimal places (e.g. 0.25 0.25). Sets the
upper left corner of active area, from the
upper left corner of tablet's surface.
Default is no offset.
ActiveArea x y
Where "x y" are in units of inches, to two
decimal places (e.g. 15.75 11.75). Sets
desired sub-area on tablet to use. Default
is: maximum tablet area minus any ActiveOff
sets, then map display screen to tablet to
find maximum usable area. Except for tablets
that do not provide a full rectangular surface
(e.g. plastic corners molded into digitizing
area), there is little reason why this option
should be used.
Combinations of ActiveOffset and ActiveArea
values that do not match well with the tablet
in use, will cause reduced usable area, incor
rect scaling, and possibly usable area cen
tered on the tablet surface.
General Note
tablets to be recognized by this module must be
set to run in Summa MM mode binary, 9600 baud, odd
parity, one stop bit. Also, usable tablet surface
is mapped by following display screen aspect
ratio; e.g. a 12x18 tablet will have maximum area
of 12x16 inches usable when the display sizes
indicate 4:3 (say, 1024x768). Previous behavior
mapped the full tablet to screen, regardless
tablet and screen aspect ratios, causing distor
tion when tracing/digitizing drawings on the
tablet.