[Bug 1796580] Re: Touchscreen breaks after suspend on Acer Aspire Switch 11

[Expired for linux (Ubuntu) because there has been no activity for 60
days.]

** Changed in: linux (Ubuntu)
Status: Incomplete => Expired

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https://bugs.launchpad.net/bugs/1796580

Title:
Touchscreen breaks after suspend on Acer Aspire Switch 11

Status in linux package in Ubuntu:
Expired

Bug description:
I'm not entirely sure this bug belongs in package xinput, but I'm
following the lead of
https://bugs.launchpad.net/ubuntu/+source/xinput/+bug/1275416, which
describes the same symptoms (but on other hardware, so likely a
different underlying problem).

On this notebook, the touchscreen works well out of the box. But as
soon as I suspend (by pressing the power button or closing the lid)
and resume again, the touch screen no longer works. Kernel and Xorg
logs show no indication of any problem, xinput still lists the
touchscreen, but it just no longer works.

The touchscreen can be made to work again by reloading the
hid_multitouch module (that works by unloading and reloading after a
resume, or by unloading the module before suspend and reloading it
after resume).

I tried updating the bios from v1.03 to the latest v1.04 (no changelog
available), but that did not change the problem.

I'm attaching a dmesg.txt in addition to the stuff ubuntu-bug
collected. In this dmesg log, I've shown a full boot, a suspend
(breaking the touchscreen), a module reload (fixing the touchscreen),
then a module unload, suspend and module reload, after which the
touchscreen also works (I've added annotations to the log to indicate
what happens when). The log also shows some USB-related errors after
suspend, but that seems to be about the bluetooth adapter (looking at
the usb ids), so I think these are unrelated.

The touchscreen in question seems to be connected through I2c,
according to dmesg:

[ 4.561527] input: SYNA7508:00 06CB:77B2 Pen as /devices/pci0000:00/INT33C3:00/i2c-1/i2c-SYNA7508:00/0018:06CB:77B2.0002/input/input8
[ 4.561741] input: SYNA7508:00 06CB:77B2 as /devices/pci0000:00/INT33C3:00/i2c-1/i2c-SYNA7508:00/0018:06CB:77B2.0002/input/input9
[ 4.561917] hid-multitouch 0018:06CB:77B2.0002: input,hidraw1: I2C HID v1.00 Mouse [SYNA7508:00 06CB:77B2] on i2c-SYNA7508:00

I realize that this is not enough information to diagnose and fix the
problem, but I'd gladly receive some suggestions on debug strategies
to dig into this issue.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: xinput 1.6.2-1build1
ProcVersionSignature: Ubuntu 4.15.0-36.39-generic 4.15.18
Uname: Linux 4.15.0-36-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.4
Architecture: amd64
BootLog: Error: [Errno 13] Permission denied: '/var/log/boot.log'
CompositorRunning: None
CurrentDesktop: ubuntu:GNOME
Date: Sun Oct 7 19:40:05 2018
DistUpgraded: Fresh install
DistroCodename: bionic
DistroVariant: ubuntu
GraphicsCard:
 Intel Corporation Device [8086:0a1e] (rev 0b) (prog-if 00 [VGA controller])
   Subsystem: Acer Incorporated [ALI] Device [1025:0930]
InstallationDate: Installed on 2018-10-06 (0 days ago)
InstallationMedia: Ubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 (20180725)
MachineType: Acer Aspire SW5-171P
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-36-generic root=UUID=4893a2e6-84af-4d45-8e31-773e622c36c6 ro quiet splash vt.handoff=1
SourcePackage: xinput
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 11/7/2014
dmi.bios.vendor: Insyde Corp.
dmi.bios.version: V1.04
dmi.board.asset.tag: Type2 - Board Asset Tag
dmi.board.name: Longchamp_S
dmi.board.vendor: Acer
dmi.board.version: V1.04
dmi.chassis.type: 10
dmi.chassis.vendor: Acer
dmi.chassis.version: Chassis Version
dmi.modalias: dmi:bvnInsydeCorp.:bvrV1.04:bd11/7/2014:svnAcer:pnAspireSW5-171P:pvrV1.04:rvnAcer:rnLongchamp_S:rvrV1.04:cvnAcer:ct10:cvrChassisVersion:
dmi.product.family: Haswell-Y System
dmi.product.name: Aspire SW5-171P
dmi.product.version: V1.04
dmi.sys.vendor: Acer
version.compiz: compiz N/A
version.libdrm2: libdrm2 2.4.91-2
version.libgl1-mesa-dri: libgl1-mesa-dri 18.0.5-0ubuntu0~18.04.1
version.libgl1-mesa-glx: libgl1-mesa-glx 18.0.5-0ubuntu0~18.04.1
version.xserver-xorg-core: xserver-xorg-core 2:1.19.6-1ubuntu4
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:18.0.1-1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917+git20171229-1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.15-2

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