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[Bug 1250051] Re: [Lenovo G780] Backlight switched off at login screen


Danato, ok now delete the .deb files made earlier and execute the following, which should work if it's the fix commit:
cd linux && git checkout 2c62333a408f5badd2d2ffd7177f95deeccc5ca4 && cp /boot/config-`uname -r` .config && yes '' | make oldconfig && make clean && make -j `getconf _NPROCESSORS_ONLN` deb-pkg LOCALVERSION=-custom && cd .. && sudo dpkg -i *.deb

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  [Lenovo G780] Backlight switched off at login screen

Status in “linux” package in Ubuntu:

Bug description:
  Whenever I used to boot on ubuntu, my login screen was too dim, I
  wouldn't know my computer was switched on until I increased the
  brightness with my keyboard.

  The problem is fixed going from http://kernel.ubuntu.com/~kernel-
  ppa/mainline/v3.12.1-trusty/ to http://kernel.ubuntu.com/~kernel-
  ppa/mainline/v3.12.2-trusty/ .

  WORKAROUND: #!/bin/sh
  cap_bright() {
     [ ! -d "$1" ] && return
      MAX=$(cat "$1/max_brightness")
      echo $MAX > "$1/brightness"
  cap_bright "/sys/class/backlight/acpi_video1"
  cap_bright "/sys/class/backlight/intel_backlight"

  ApportVersion: 2.12.5-0ubuntu2.1
  Architecture: amd64
   /dev/snd/controlC0:  danato     1777 F.... pulseaudio
   country MO:
    (2402 - 2482 @ 40), (N/A, 20)
    (5170 - 5250 @ 40), (3, 23)
    (5250 - 5330 @ 40), (3, 23), DFS
    (5735 - 5835 @ 40), (3, 30)
  DistroRelease: Ubuntu 13.10
  InstallationDate: Installed on 2013-11-05 (5 days ago)
  InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424)
  MachineType: LENOVO 20138
  MarkForUpload: True
  Package: linux (not installed)
   0 nouveaufb
   1 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.11.0-13-generic root=UUID=be58180f-8d25-4719-a049-001ce96e4bb2 ro quiet splash vt.handoff=7
  ProcVersionSignature: Ubuntu 3.11.0-13.20-generic 3.11.6
   linux-restricted-modules-3.11.0-13-generic N/A
   linux-backports-modules-3.11.0-13-generic  N/A
   linux-firmware                             1.116
  StagingDrivers: rts5139
  Tags:  saucy staging
  Uname: Linux 3.11.0-13-generic x86_64
  UpgradeStatus: Upgraded to saucy on 2013-11-06 (5 days ago)
  UserGroups: adm cdrom dip lpadmin netdev plugdev sambashare sudo
  dmi.bios.date: 12/19/2012
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 5ECN95WW(V9.00)
  dmi.board.asset.tag: No Asset Tag
  dmi.board.name: INVALID
  dmi.board.vendor: LENOVO
  dmi.board.version: 31900003WIN8 STD MLT
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Lenovo G780
  dmi.modalias: dmi:bvnLENOVO:bvr5ECN95WW(V9.00):bd12/19/2012:svnLENOVO:pn20138:pvrLenovoG780:rvnLENOVO:rnINVALID:rvr31900003WIN8STDMLT:cvnLENOVO:ct10:cvrLenovoG780:
  dmi.product.name: 20138
  dmi.product.version: Lenovo G780
  dmi.sys.vendor: LENOVO

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