Touchscreen/stylus always reports 1% battery [patch]

[Trent Gamblin]

I have a Dell 5379 with a touchscreen that always reports 1% battery with the stylus. This pops up a low battery notification the first time I use the stylus after booting. The attached patch tells the kernel to ignore the battery on this particular device, since it appears to not report information correctly anyway.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: linux-image-4.15.0-36-generic 4.15.0-36.39
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
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: trent 1734 F.... pulseaudio
CurrentDesktop: ubuntu:GNOME
Date: Tue Oct 9 22:42:47 2018
HibernationDevice: RESUME=UUID=aef6a948-4599-4581-99a2-44b7944d2d58
InstallationDate: Installed on 2018-05-10 (153 days ago)
InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
Lsusb:
 Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
 Bus 001 Device 004: ID 04f3:2361 Elan Microelectronics Corp.
 Bus 001 Device 003: ID 8087:0025 Intel Corp.
 Bus 001 Device 002: ID 0bda:5696 Realtek Semiconductor Corp.
 Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
MachineType: Dell Inc. Inspiron 5379
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_CA.UTF-8
 SHELL=/bin/bash
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.15.0-36-generic root=/dev/mapper/ubuntu--vg-root ro quiet splash vt.handoff=1
RelatedPackageVersions:
 linux-restricted-modules-4.15.0-36-generic N/A
 linux-backports-modules-4.15.0-36-generic N/A
 linux-firmware 1.173.1
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 07/19/2018
dmi.bios.vendor: Dell Inc.
dmi.bios.version: 1.10.0
dmi.board.name: 05G60G
dmi.board.vendor: Dell Inc.
dmi.board.version: A00
dmi.chassis.type: 10
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.:bvr1.10.0:bd07/19/2018:svnDellInc.:pnInspiron5379:pvr:rvnDellInc.:rn05G60G:rvrA00:cvnDellInc.:ct10:cvr:
dmi.product.family: Inspiron
dmi.product.name: Inspiron 5379
dmi.sys.vendor: Dell Inc.

[Ubuntu Kernel Bot (ubuntu-kernel-bot)]

This change was made by a bot.

[Joseph Salisbury (jsalisbury)]

Did this issue start happening after an update/upgrade? Was there a prior kernel version where you were not having this particular problem?

Would it be possible for you to test the latest upstream kernel? Refer to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest v4.19 kernel[0].

If this bug is fixed in the mainline kernel, please add the following tag 'kernel-fixed-upstream'.

If the mainline kernel does not fix this bug, please add the tag: 'kernel-bug-exists-upstream'.

Once testing of the upstream kernel is complete, please mark this bug as "Confirmed".

Thanks in advance.

[0] http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.19-rc7

[Trent Gamblin (goobliata)]

The bug still exists in 4.19rc7.

[Trent Gamblin (goobliata)]

Forget to answer, this bug has existed on every kernel I've tried, which is limited to Ubuntu 18.04.

[Kai-Heng Feng (kaihengfeng)]

Please upstream your patch so we can backport it to Ubuntu's kernel.

[Trent Gamblin (goobliata)]

I've posted it to the linux-input list a few times but was ignored, so I tried here.

[Kai-Heng Feng (kaihengfeng)]

Upstream maintainers are busy, so it's quite normal. Please be patient.

[Trent Gamblin (goobliata)]

I'll try again someday.