(In reply to comment #47)
> I believe the touch-grab-race-condition-56578-v2 patch series so far creates
> a problem with mouse input. In Sugar's Paint application, I can't paint
> anything by moving the mouse around with the button held down.
>
> Running xev, I can see that clicking and holding the mouse button doesn't
> actually trigger any events. Only when I release, ButtonPress and
> ButtonRelease appear in quick succession.
I have reproduced this by checking out the git branch in question and
building it directly, so it was not a side effect of my earlier attempt
(above) where I had backported this to 1.13.3.
The problem can be reproduced very easily: xinit /usr/bin/xev (running
over ssh from another machine, to be able to see stdout)
Move the mouse cursor to the top left (where the xev window is). Click
and hold the mouse button, and keep holding. No output from xev. Now
release the mouse button, ButtonPress and ButtonRelease arrive at the
same time. No touch input is needed to see this problem.
A few churns of "git bisect" later I have tracked this down to:
3e1515898545b0ed9e1f0794800c07061c8c8039 is the first bad commit
commit 3e1515898545b0ed9e1f0794800c07061c8c8039
Author: Peter Hutterer <peter.hutte...@who-t.net>
Date: Thu Apr 18 10:32:11 2013 +1000
dix: drop DeviceIntRec's activeGrab struct
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https://bugs.launchpad.net/bugs/1015183
Title:
Inconsistent mouse events for Acer T231H multitouch monitor
Status in HWE Next Project:
New
Status in X.Org X server:
In Progress
Status in “xorg-server” package in Ubuntu:
In Progress
Bug description:
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
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