** Summary changed:
- Wacom pointer not absolute by default
+ /dev/wacom should be /dev/input/wacom in xorg.conf for USB tablets by default
** Description changed:
+ SOLUTION: The hint Colin gave me below fixed the entire problem
+ (changing /dev/wacom into /dev/input/wacom in xorg.conf). My question is
+ - why doesn't Ubuntu detect and change this automatically? It's
+ something so horribly simple (heck, even the comments in xorg.conf say
+ so), but because the tablet 'works' by default, I never thought changing
+ that entry would solve anything. It just kept me looking it all the
+ wrong directions.
+
+ I changed the Summary of this bug to describe the solution properly.
+
+ *** Original description of the problem: ***
+
My problem with my Wacom Graphire USB is similar to bug #44279, and has
been existing in every Ubuntu release so far where the tablet would work
out of the box, including Feisty.
Steps to reproduce, partially quoting from bug #44279, adjusted to my
situation:
1. Boot any Ubuntu release with Wacom support
2. Plug in the Wacom Graphire tablet (I expect other graphire tablets to
exhibit the same problem).
3. Place the Wacom pen in the top left position on the tablet.
4. The mouse pointer should move to the top left corner of the screen.
5. Move the pen diagonally across the tablet towards the lower right
corner. Stop when the pen reaches the lower right corner of the tablet.
Observe that the mouse pointer has not yet reached the lower right
corner of the screen.
What you see here is a failed attempt at using absolute positioning.
What it looks like is an attempt to translate purely relative
positioning into an absolute position much like navigation by dead
reckoning. Unfortunately there seems to be a large deviation.
This issue is quite annoying for someone working with a tablet,
especially since aside from the underrun I describe here, there's also
an overrun effect from time to time, where the mouse pointer has already
reached the edge of the screen whereas the pen has not yet reached the
end of the tablet (main description from bug #44279). There's no telling
which one of the two effects will happen when, it seems random and they
are both very annoying.
One thing this bug does NOT share with bug #44279, is the reference to
bug #44274, that seems to be / have been a different problem which I'm
not experiencing.
Update: I checked the wacom manpage, which mentions this:
Option "Mode" "Relative"|"Absolute"
sets the mode of the device.
I brief 'hurray, found it!' moment flashed my mind. However, when I
looked at /var/log/Xorg.0.log I noticed this:
(**) stylus device is /dev/wacom
(**) stylus is in absolute mode
(**) stylus: forcing TabletPC ISD V4 protocol
(**) WACOM: suppress value is 2
(**) Option "BaudRate" "9600"
(**) stylus: serial speed 9600
(**) Option "SendCoreEvents"
(**) cursor: always reports core events
(**) cursor device is /dev/wacom
(**) cursor is in relative mode
(**) cursor: forcing TabletPC ISD V4 protocol
(**) WACOM: suppress value is 2
(**) Option "BaudRate" "9600"
(**) cursor: serial speed 9600
(**) Option "SendCoreEvents"
(**) eraser: always reports core events
(**) eraser device is /dev/wacom
(**) eraser is in absolute mode
So... Both the stylus and the eraser are in absolute mode, but the
cursor is not. So I tried the eraser, expecting it to be in 'real'
absolute mode... but no. The problem remains. 'Absolute' mode just seems
to be buggy.
-
- As always, if more info is needed, I'll happily submit it.
--
/dev/wacom should be /dev/input/wacom in xorg.conf for USB tablets by default
https://bugs.launchpad.net/bugs/117170
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