Public bug reported:

Whenever I operate a mouse and simultaneously use the touchscreen, the whole 
user interface freezes:
- no mouse operation possible
- no keyboard operation
- video playback halts
- fan goes up

The duration of this freeze seems to be related to the amount of input,
I'm generating simultaneously with the touchscreen and the mouse.

After a few seconds:
- mouse operates normally again
- all missing keyboard input is showing up immediately wherever I had the focus
- video skips the frozen seconds and continues
- fan returns to normal operation

It doesn't matter whether I use a bluetooth mouse or the touchpad. Note
that this does not happen when simultaneously operating mouse and
touchpad.

It seems to me that xorg is running into some kind of loop, possibly
trying to make sense of contradictory input from mouse/touchpad and
touchscreen.

Yes, this is an unlikely situation, but it happens most of the time when
someone else is trying to show me something on the screen and
accidentally touches it, while I'm doing something with the mouse.

Lenovo Yoga 2-13

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: xorg 1:7.7+13ubuntu3
ProcVersionSignature: Ubuntu 4.4.0-36.55-generic 4.4.16
Uname: Linux 4.4.0-36-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.1
Architecture: amd64
CompizPlugins: No value set for 
`/apps/compiz-1/general/screen0/options/active_plugins'
CompositorRunning: None
CurrentDesktop: GNOME
Date: Tue Sep 20 08:52:08 2016
DistUpgraded: 2016-04-16 21:39:36,340 ERROR got error from PostInstallScript 
./xorg_fix_proprietary.py (g-exec-error-quark: Failed to execute child process 
"./xorg_fix_proprietary.py" (No such file or directory) (8))
DistroCodename: xenial
DistroVariant: ubuntu
DkmsStatus: virtualbox, 5.0.24, 4.4.0-36-generic, x86_64: installed
ExtraDebuggingInterest: Yes, including running git bisection searches
GpuHangFrequency: Very infrequently
GraphicsCard:
 Intel Corporation Haswell-ULT Integrated Graphics Controller [8086:0a16] (rev 
0b) (prog-if 00 [VGA controller])
   Subsystem: Lenovo Haswell-ULT Integrated Graphics Controller [17aa:3978]
InstallationDate: Installed on 2015-04-27 (511 days ago)
InstallationMedia: Ubuntu-GNOME 15.04 "Vivid Vervet" - Release amd64 (20150422)
MachineType: LENOVO 20344
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-36-generic 
root=UUID=fb134926-2b61-4b75-8893-60390fe33923 ro quiet splash vt.handoff=7
SourcePackage: xorg
Symptom: display
Title: Xorg freeze
UpgradeStatus: Upgraded to xenial on 2016-04-16 (156 days ago)
dmi.bios.date: 07/21/2015
dmi.bios.vendor: LENOVO
dmi.bios.version: 96CN31WW(V1.17)
dmi.board.asset.tag: 31900058Std
dmi.board.name: INVALID
dmi.board.vendor: LENOVO
dmi.board.version: 31900058Std
dmi.chassis.asset.tag: 31900058Std
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Lenovo Yoga 2 13
dmi.modalias: 
dmi:bvnLENOVO:bvr96CN31WW(V1.17):bd07/21/2015:svnLENOVO:pn20344:pvrLenovoYoga213:rvnLENOVO:rnINVALID:rvr31900058Std:cvnLENOVO:ct10:cvrLenovoYoga213:
dmi.product.name: 20344
dmi.product.version: Lenovo Yoga 2 13
dmi.sys.vendor: LENOVO
version.compiz: compiz N/A
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.67-1ubuntu0.16.04.2
version.libgl1-mesa-dri: libgl1-mesa-dri 11.2.0-1ubuntu2.2
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 11.2.0-1ubuntu2.2
version.xserver-xorg-core: xserver-xorg-core 2:1.18.3-1ubuntu2.3
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.10.1-1ubuntu2
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.7.0-1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 
2:2.99.917+git20160325-1ubuntu1.1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.12-1build2
xserver.bootTime: Sat Apr 16 17:11:40 2016
xserver.configfile: default
xserver.errors:
 
xserver.logfile: /var/log/Xorg.0.log
xserver.outputs:
 product id                                1069 
 vendor                                     LGD
xserver.version: 2:1.17.2-1ubuntu9.1

** Affects: xorg (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug freeze ubuntu xenial

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https://bugs.launchpad.net/bugs/1625477

Title:
  Xorg freezes on simultaneous touchscreen and mouse input

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