kernel-packages team mailing list archive

[Jan Koci <cicindel@xxxxxxxxx>]

I can partially reproduce this bug on Dell Latitude E6420.

Namely in 16.04 (4.4 kernel) backlight was always on after (re)boot and
screenlock, however waking up (opening laptop) does not switch backlight
on. Moreover I could control the backlight (i.e. switch it off),
contrary to some reports above.

After downgrade to 14.04.4 (4.2 kernel; downgraded for plethora of more
serious issues) this still occurs at least after boot and screenlock
(I'm still copying my backup to hdd so I don't want to test waking up).
I can still control it and switch it off (with Fn+rightarrow on my
model).

Last kernel this worked for me properly was 3.19 (14.04.3 with vivid
kernel I believe).

-- 
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https://bugs.launchpad.net/bugs/1510344

Title:
  Keyboard Backlight Turns on at boot

Status in Dell Sputnik:
  Confirmed
Status in One Hundred Papercuts:
  Confirmed
Status in Linux:
  New
Status in linux package in Ubuntu:
  Confirmed

Bug description:
  System: Dell XPS 13 9343

  Action: Boot computer

  Expected Behavior: Keyboard backlight would be off when computer is
  booted

  Actual Behavior: Keyboard backlight is on at boot

  This did not happen with Ubuntu 15.04

  There are new files in Ubuntu 15.10 -
  /sys/class/leds/dell::kbd_backlight$

  cat stop_timeout
  60s

   cat start_triggers 
  +keyboard +touchpad

  cat trigger 
  [none] AC-online BAT0-charging-or-full BAT0-charging BAT0-full BAT0-charging-blink-full-solid usb-gadget usb-host cpu0 cpu1 cpu2 cpu3 mmc0 rfkill0

  cat brightness 
  2

  ---

  Unsure if these files are important, but included in the report

  ProblemType: Bug
  DistroRelease: Ubuntu 15.10
  Package: linux-image-4.1.0-2-generic 4.1.0-2.2
  ProcVersionSignature: Ubuntu 4.1.0-2.2-generic 4.1.3
  Uname: Linux 4.1.0-2-generic x86_64
  ApportVersion: 2.18-0ubuntu5
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  ubuntu     2488 F.... pulseaudio
   /dev/snd/controlC0:  ubuntu     2488 F.... pulseaudio
  CasperVersion: 1.362
  CurrentDesktop: Unity
  Date: Tue Oct 27 01:29:47 2015
  IwConfig:
   enx00249b0981e3  no wireless extensions.
   
   lo        no wireless extensions.
  LiveMediaBuild: Ubuntu 15.10 "Wily Werewolf" - Alpha amd64 (20150730)
  MachineType: Dell Inc. XPS 13 9343
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/casper/vmlinuz.efi file=/cdrom/preseed/username.seed boot=casper quiet splash --- cdrom-detect/try-usb=true noprompt
  RelatedPackageVersions:
   linux-restricted-modules-4.1.0-2-generic N/A
   linux-backports-modules-4.1.0-2-generic  N/A
   linux-firmware                           1.145
  RfKill:
   0: hci0: Bluetooth
   	Soft blocked: no
   	Hard blocked: no
  SourcePackage: linux
  UdevLog: Error: [Errno 2] No such file or directory: '/var/log/udev'
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 07/14/2015
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A05
  dmi.board.name: 0TM99H
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 9
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: dmi:bvnDellInc.:bvrA05:bd07/14/2015:svnDellInc.:pnXPS139343:pvr:rvnDellInc.:rn0TM99H:rvrA00:cvnDellInc.:ct9:cvr:
  dmi.product.name: XPS 13 9343
  dmi.sys.vendor: Dell Inc.

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