Public bug reported:
I already submitted this at http://askubuntu.com/questions/153043/ but
decided to update to the latest development snapshot in order to give
that a try and write a proper bug report if the issue persists. It does
persist.
My setup is a quantal alpha 1, just upgraded from precise, with an Acer
T231H multitouch monitor connected to it, as well as an ordinary mouse
for testing. The mouse events as X sends them to the applications are
inconsitent. This can be debugged using xev.
The first touch of the screen is preceeded by a MotionNotify event which
already has state 0x100, i.e. left mouse button pressed. After that
comes a ButtonPress event, again with state 0x100 although that value
should indicate the state of the buttons before the event occurred. The
subsequent drag is all right, and the ButtonRelease as well, but the
0x100 bit in the state value will never become zero again.
Even if I've got an ordinary mouse connected as well, it will henceforth
report every movement as if I were keeping the left mouse button down.
The only cure that I could find was restarting the X server. Together
with the ButtonPress and ButtonRelease events, this constant bit for
left mouse button amounts to an inconsistent reporting of button state.
Java applications e.g. will report every move as a drag due to this
issue, with severe implications for focus management. This makes using
differenent parts of the application almost impossible, as mouse
movement will only be reported to the component where the mouse entered
the application window.
Since reporting at askubuntu, I've run some tests with evtest. The data
coming from the event device looks sane enough: BTN_TOUCH events for the
first finger, with value 1 for pressed and 0 for released.
ABS_MT_TRACKING_ID for all fingers, with a non-negative value for
pressed and -1 for released. The grouping into syn groups looks sane as
well. So I'd say the kernel driver works as intended, and somewhere from
there to the xevent layer, some internal state gets messed up.
I'm willing to try out any patches you might propose, be it in an
attempt to fix this, or only to gather more information.
Expected behaviour:
MotionNotify with state 0x000 when dragging the ordinary mouse
MotionNotify with state 0x000 for move prior to touch, or no event at all
ButtonPress with state 0x000 when touching the screen
MotionNotify with state 0x100 while dragging the finger
ButtonRelease with state 0x100 when lifting the finger
MotionNotify with state 0x000 when dragging the ordinary mouse afterwards
Actual behaviour:
MotionNotify with state 0x000 when dragging the ordinary mouse before the
first touch
MotionNotify with state 0x100 for prior to ButtonPress event
ButtonPress with state 0x100 when touching the screen
MotionNotify with state 0x100 while dragging the finger
ButtonRelease with state 0x100 when lifting the finger
MotionNotify with state 0x100 when dragging the ordinary mouse afterwards
ProblemType: Bug
DistroRelease: Ubuntu 12.10
Package: xserver-xorg-input-evdev 1:2.7.0-0ubuntu2
ProcVersionSignature: Ubuntu 3.4.0-5.11-generic 3.4.0
Uname: Linux 3.4.0-5-generic x86_64
ApportVersion: 2.2.3-0ubuntu5
Architecture: amd64
CurrentDmesg: [ 7.381404] ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready
Date: Tue Jun 19 17:56:46 2012
DistUpgraded: 2012-06-19 17:51:23,756 DEBUG enabling apt cron job
DistroCodename: quantal
DistroVariant: ubuntu
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64
(20120425)
ProcEnviron:
TERM=xterm
PATH=(custom, no user)
LANG=en_US.UTF-8
SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.4.0-5-generic
root=UUID=88133c52-550c-4c43-9da5-15f180bdb767 ro quiet splash vt.handoff=7
SourcePackage: xserver-xorg-input-evdev
UpgradeStatus: Upgraded to quantal on 2012-06-19 (0 days ago)
dmi.bios.date: 09/22/2011
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 4.6.4
dmi.board.name: AMD HUDSON-M1
dmi.board.vendor: ZOTAC
dmi.chassis.type: 3
dmi.modalias:
dmi:bvnAmericanMegatrendsInc.:bvr4.6.4:bd09/22/2011:svn:pn:pvr:rvnZOTAC:rnAMDHUDSON-M1:rvr:cvn:ct3:cvr:
version.compiz: compiz 1:0.9.7.8-0ubuntu3
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.33-1
version.libgl1-mesa-dri: libgl1-mesa-dri 8.0.3-0ubuntu1
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 8.0.3-0ubuntu1
version.xserver-xorg-core: xserver-xorg-core 2:1.11.4-0ubuntu11
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.7.0-0ubuntu2
version.xserver-xorg-video-ati: xserver-xorg-video-ati
1:6.14.99~git20111219.aacbd629-0ubuntu2
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.19.0-1ubuntu1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau
1:0.0.16+git20120614+36d3f8c-1
** Affects: xserver-xorg-input-evdev (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug quantal running-unity ubuntu
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https://bugs.launchpad.net/bugs/1015183
Title:
Inconsistent mouse events for Acer T231H multitouch monitor
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