Public bug reported:
Expected behavior: Mouse follows stylus.
What actually happens: Mouse moves with X=Y no matter where the stylus is.
Detail:
I have an HP Revolve 810 G2 Tablet PC, it uses an Atmel MaxTouch digitizer for
both finger and stylus-based input.
I'm running Xubuntu 14.04 x64. Finger touch works fine, once calibrated.
However, the stylus moves diagonally from upper left to lower right no matter
where on the screen I put the tip of the stylus.
Fix:
I was able to fix this problem by building a raw linux kernel after editing
"drivers/hid/hid-input.c", applying a patch like:
static void hidinput_configure_usage(struct hid_input *hidinput, struct
hid_fiel if (field->flags & HID_MAIN_ITEM_RELATIVE)
map_rel(usage->hid & 0xf);
else
- map_abs(usage->hid & 0xf);
+ map_abs_clear(usage->hid & 0xf);
break;
case HID_GD_HATSWITCH:
Obviously, this kernel causes a lot of issues without Ubuntu's patches
for X and whatnot, so this is not really useable other than for testing
that the pen works fine with this kernel. Built on kernel 3.18.4, but it
should work for any kernel in the 3.x branch.
ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: linux-image-3.16.0-30-generic 3.16.0-30.40~14.04.1
ProcVersionSignature: Ubuntu 3.16.0-30.40~14.04.1-generic 3.16.7-ckt3
Uname: Linux 3.16.0-30-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.6
Architecture: amd64
Date: Wed Feb 4 12:03:06 2015
InstallationDate: Installed on 2014-10-05 (121 days ago)
InstallationMedia: Xubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140416.2)
ProcEnviron:
LANGUAGE=en_US
TERM=screen
PATH=(custom, no user)
LANG=en_US.UTF-8
SHELL=/bin/bash
SourcePackage: linux-lts-utopic
UpgradeStatus: No upgrade log present (probably fresh install)
** Affects: linux-lts-utopic (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug third-party-packages trusty
--
You received this bug notification because you are a member of Ubuntu
Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/1418130
Title:
Kernel doesn't respond to stylus properly
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux-lts-utopic/+bug/1418130/+subscriptions
--
ubuntu-bugs mailing list
[email protected]
https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
