Elographics touch event freezes Xorg

[Ville Ranki]

I tried to set up a Elo serial touch screen. I managed to configure the touch screen so that Xorg detects it successfully. But when the screen is touched, Xorg (and possibly kernel) totally crashes or freezes. Even switching to virtual terminals does not work and the computer has to be reset.

This succeeded on a Debian system. My hardware setup should be ok.

May be related to #774398.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: xserver-xorg-input-elographics 1:1.3.0-1build2
ProcVersionSignature: Ubuntu 3.2.0-31.50-generic-pae 3.2.28
Uname: Linux 3.2.0-31-generic-pae i686
NonfreeKernelModules: nvidia
ApportVersion: 2.0.1-0ubuntu13
Architecture: i386
CheckboxSubmission: 5411b7083f2413511daec522a712c016
CheckboxSystem: b845c366ea09c60efa3a45c1b5b21525
Date: Fri Sep 28 16:20:55 2012
EcryptfsInUse: Yes
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release i386 (20110427.1)
ProcEnviron:
 TERM=xterm
 PATH=(custom, user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: xserver-xorg-input-elographics
UpgradeStatus: Upgraded to precise on 2012-05-03 (148 days ago)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[d.w. harks (dwink)]

This crashes X for me on an OpenChrome-based xorg.

X loads the driver and configures it properly:

[ 1627.087] (II) Using input driver 'elographics' for 'ELO Touchscreen'
[ 1627.087] (II) Loading /usr/lib/xorg/modules/input/elographics_drv.so
[ 1627.087] (**) ELO Touchscreen: always reports core events
[ 1627.087] (**) Elographics X device name: TOUCHSCREEN
[ 1627.087] (**) Elographics associated screen: 0
[ 1627.087] (**) Elographics untouch delay: 50 ms
[ 1627.087] (**) Elographics report delay: 10 ms
[ 1627.087] (**) Option "MaxX" "3528"
[ 1627.087] (**) Elographics maximum x position: 3528
[ 1627.087] (**) Option "MinX" "474"
[ 1627.087] (**) Elographics minimum x position: 474
[ 1627.087] (**) Option "MaxY" "3498"
[ 1627.087] (**) Elographics maximum y position: 3498
[ 1627.087] (**) Option "MinY" "568"
[ 1627.087] (**) Elographics minimum y position: 568
[ 1627.087] (**) Elographics device will work in Landscape mode
[ 1627.087] (II) XINPUT: Adding extended input device "TOUCHSCREEN" (type: Elographics TouchScreen, id 6)
[ 1627.087] (**) TOUCHSCREEN: (accel) keeping acceleration scheme 1
[ 1627.087] (**) TOUCHSCREEN: (accel) acceleration profile 0
[ 1627.087] (**) TOUCHSCREEN: (accel) acceleration factor: 2.000
[ 1627.087] (**) TOUCHSCREEN: (accel) acceleration threshold: 4
[ 1627.087] (**) Option "Device" "/dev/ttyS0"
[ 1627.088] (**) Option "BaudRate" "9600"
[ 1627.088] (**) Option "StopBits" "1"
[ 1627.088] (**) Option "DataBits" "8"
[ 1627.088] (**) Option "Parity" "None"
[ 1627.088] (**) Option "FlowControl" "None"
[ 1627.155] (--) Elographics touchscreen is a AccuTouch, connected through a serial link.
[ 1627.155] (--) The controller is a model E271-2200, firmware revision 1.0.

Backtrace:
[ 1629.372] 0: /usr/bin/X (xorg_backtrace+0x37) [0xb76f9647]
[ 1629.372] 1: /usr/bin/X (0xb7571000+0x18c3ca) [0xb76fd3ca]
[ 1629.372] 2: (vdso) (__kernel_rt_sigreturn+0x0) [0xb754e40c]
[ 1629.372] 3: /usr/bin/X (0xb7571000+0x4c863) [0xb75bd863]
[ 1629.372] 4: /usr/bin/X (0xb7571000+0x4d1dd) [0xb75be1dd]
[ 1629.372] 5: /usr/bin/X (GetPointerEvents+0x10e) [0xb75bf5fe]
[ 1629.372] 6: /usr/bin/X (QueuePointerEvents+0x4c) [0xb75bfb2c]
[ 1629.373] 7: /usr/bin/X (xf86PostMotionEventM+0xf9) [0xb75fed99]
[ 1629.373] 8: /usr/bin/X (xf86PostMotionEvent+0xae) [0xb75fefee]
[ 1629.373] 9: /usr/lib/xorg/modules/input/elographics_drv.so (0xb7545000+0x1120) [0xb7546120]
[ 1629.373] 10: /usr/bin/X (0xb7571000+0x78381) [0xb75e9381]
[ 1629.373] 11: /usr/bin/X (0xb7571000+0x9fce8) [0xb7610ce8]
[ 1629.373] 12: (vdso) (__kernel_sigreturn+0x0) [0xb754e400]
[ 1629.373] 13: (vdso) (__kernel_vsyscall+0x10) [0xb754e424]
[ 1629.373] 14: /lib/i386-linux-gnu/libc.so.6 (__select+0x61) [0xb72acd61]
[ 1629.374] 15: /usr/bin/X (WaitForSomething+0x18c) [0xb76f689c]
[ 1629.374] 16: /usr/bin/X (0xb7571000+0x376a2) [0xb75a86a2]
[ 1629.374] 17: /usr/bin/X (0xb7571000+0x2535a) [0xb759635a]
[ 1629.374] 18: /lib/i386-linux-gnu/libc.so.6 (__libc_start_main+0xf3) [0xb71de4d3]
[ 1629.374] 19: /usr/bin/X (0xb7571000+0x25699) [0xb7596699]
[ 1629.374] Segmentation fault at address 0xc
[ 1629.374]
Caught signal 11 (Segmentation fault). Serv...