Oops, it was either acpi_osi=! or acpi_osi='Windows 2009' that was
causing the problem. I had copied them in to try and get the nvidia card
working after resume, but it turns out they aren't needed for the nvidia
card to work anyway.

Sorry for the noise.

** Changed in: upower (Ubuntu)
       Status: Incomplete => Invalid

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

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https://bugs.launchpad.net/bugs/1812161

Title:
  Screen backlight control does not work in Disco on Dell XPS 9560

Status in linux package in Ubuntu:
  Invalid
Status in upower package in Ubuntu:
  Invalid

Bug description:
  When I press the screen backlight up/down buttons, gnome-shell pops up
  the backlight control window saying that the backlight is being
  adjusted, but the actual screen brightness does not change.

  The problem is that gnome is adjusting
  /sys/class/backlight/acpi_video0/brightness instead of
  /sys/class/backlight/intel_backlight/brightness. If I manually change
  the latter as root with, say:

  root@xps-9560:~ echo 600 >
  /sys/class/backlight/intel_backlight/brightness

  then the brightness changes.

  The brightness control worked fine in Cosmic on this laptop, so this
  is a regression.

  ProblemType: Bug
  DistroRelease: Ubuntu 19.04
  Package: xorg 1:7.7+19ubuntu8
  ProcVersionSignature: Ubuntu 4.18.0-13.14-generic 4.18.17
  Uname: Linux 4.18.0-13-generic x86_64
  .tmp.unity_support_test.0:
   
  ApportVersion: 2.20.10-0ubuntu18
  Architecture: amd64
  CompizPlugins: No value set for 
`/apps/compiz-1/general/screen0/options/active_plugins'
  CompositorRunning: None
  CurrentDesktop: ubuntu:GNOME
  Date: Thu Jan 17 14:47:37 2019
  DistUpgraded: 2019-01-15 23:10:12,938 DEBUG Running PostInstallScript: 
'./xorg_fix_proprietary.py'
  DistroCodename: disco
  DistroVariant: ubuntu
  DkmsStatus:
   bbswitch, 0.8, 4.18.0-13-generic, x86_64: installed
   bbswitch, 0.8, 4.20.0-042000-generic, x86_64: installed
   bbswitch, 0.8, 4.20.3-042003-generic, x86_64: installed
   nvidia, 415.27, 4.20.0-042000-generic, x86_64: installed
   nvidia, 415.27, 4.20.3-042003-generic, x86_64: installed
  ExtraDebuggingInterest: Yes
  GraphicsCard:
   Intel Corporation Device [8086:591b] (rev 04) (prog-if 00 [VGA controller])
     Subsystem: Dell Device [1028:07be]
     Subsystem: Dell GP107M [GeForce GTX 1050 Mobile] [1028:07be]
  InstallationDate: Installed on 2017-08-16 (518 days ago)
  InstallationMedia: Ubuntu 17.04 "Zesty Zapus" - Release amd64 (20170412)
  MachineType: Dell Inc. XPS 15 9560
  ProcKernelCmdLine: BOOT_IMAGE=/@/boot/vmlinuz-4.18.0-13-generic 
root=UUID=0eb64261-6dff-464a-8373-596794c1fafe ro rootflags=subvol=@ quiet 
splash acpi_rev_override=5 scsi_mod.use_blk_mq=1 i915.modeset=1 nouveau.runpm=0 
rcutree.rcu_idle_gp_delay=1 acpi_osi=! "acpi_osi=Windows 2009"
  SourcePackage: xorg
  Symptom: display
  UpgradeStatus: Upgraded to disco on 2019-01-15 (1 days ago)
  dmi.bios.date: 10/02/2018
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: 1.12.1
  dmi.board.name: 05FFDN
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 10
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: 
dmi:bvnDellInc.:bvr1.12.1:bd10/02/2018:svnDellInc.:pnXPS159560:pvr:rvnDellInc.:rn05FFDN:rvrA00:cvnDellInc.:ct10:cvr:
  dmi.product.family: XPS
  dmi.product.name: XPS 15 9560
  dmi.product.sku: 07BE
  dmi.sys.vendor: Dell Inc.
  version.compiz: compiz 1:0.9.13.1+19.04.20190103-0ubuntu1
  version.libdrm2: libdrm2 2.4.95-1
  version.libgl1-mesa-dri: libgl1-mesa-dri 18.2.8-2ubuntu1
  version.libgl1-mesa-glx: libgl1-mesa-glx 18.2.8-2ubuntu1
  version.xserver-xorg-core: xserver-xorg-core 2:1.20.3-1ubuntu1
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:18.1.0-1
  version.xserver-xorg-video-intel: xserver-xorg-video-intel N/A
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.15-3

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