First, kudos to Joseph, my guesswork is based on his hard work.
Here's my theory: SMO91D0 (iio sensor hub) is connected to i2c's master
adapter, SYNA7500 is connected to i2c's slave adapter.
We can see that in v4.12, both of them gets detected but SMO* doesn't
get probed correctly. In v4.13, the support for i2c master/slave code
got merged, now SMO* device can work, but the SYNA* is missing, because
it's connected to the slave adapter.
Here's the relevant code:
#if IS_ENABLED(CONFIG_I2C_DESIGNWARE_SLAVE)
extern int i2c_dw_probe_slave(struct dw_i2c_dev *dev);
#else
static inline int i2c_dw_probe_slave(struct dw_i2c_dev *dev) { return -EINVAL; }
#endif
Right now CONFIG_I2C_DESIGNWARE_SLAVE is not enabled, so let's try if
enable it can make your touchscreen work again:
http://people.canonical.com/~khfeng/lp1745342-i2c-slave/
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https://bugs.launchpad.net/bugs/1745342
Title:
touchscreen that worked in artful with 4.12 no longer works with 4.13
Status in linux package in Ubuntu:
In Progress
Status in linux source package in Artful:
In Progress
Status in linux source package in Bionic:
In Progress
Bug description:
I have a Dell Venue 11 Pro 7139, and when I installed artful on it
(before release) it worked fine. Recently (over the xmas break I think
but I'm not sure; this is not a machine I intended to pay too much
attention to) the kernel moved from 4.12 to 4.13, and the touchscreen
has stopped working.
I _think_ the last kernel to work was 4.12.0-13. I haven't done any
sort of bisection though.
ProblemType: Bug
DistroRelease: Ubuntu 17.10
Package: linux-image-4.13.0-31-generic 4.13.0-31.34
ProcVersionSignature: Ubuntu 4.13.0-31.34-generic 4.13.13
Uname: Linux 4.13.0-31-generic x86_64
ApportVersion: 2.20.7-0ubuntu3.7
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: john 1041 F.... pulseaudio
/dev/snd/pcmC1D0p: john 1041 F...m pulseaudio
/dev/snd/controlC1: john 1041 F.... pulseaudio
Date: Thu Jan 25 10:18:51 2018
InstallationDate: Installed on 2017-07-10 (198 days ago)
InstallationMedia: Ubuntu 17.10 "Artful Aardvark" - Alpha amd64 (20170709)
MachineType: Dell Inc. Venue 11 Pro 7139
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.13.0-31-generic.efi.signed
root=UUID=73f0adac-318e-4295-9980-15fb36257cd5 ro quiet splash vt.handoff=7
RelatedPackageVersions:
linux-restricted-modules-4.13.0-31-generic N/A
linux-backports-modules-4.13.0-31-generic N/A
linux-firmware 1.169.2
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 06/15/2015
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A16
dmi.board.name: 0Y4RMT
dmi.board.vendor: Dell Inc.
dmi.board.version: A00
dmi.chassis.type: 8
dmi.chassis.vendor: Dell Inc.
dmi.modalias:
dmi:bvnDellInc.:bvrA16:bd06/15/2015:svnDellInc.:pnVenue11Pro7139:pvr01:rvnDellInc.:rn0Y4RMT:rvrA00:cvnDellInc.:ct8:cvr:
dmi.product.name: Venue 11 Pro 7139
dmi.product.version: 01
dmi.sys.vendor: Dell Inc.
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