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[Black <daltonfury42@xxxxxxxxx>]

I've tested, and the bug still exists when I boot into Ubuntu via UEFI

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https://bugs.launchpad.net/bugs/1461986

Title:
  can't change usb_charge attribute in /sys/devices/platform/sony-laptop

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  I am on a Sony VAIO svf43142sn. My laptop has the ability to leave a USB port powered on even after shutdown to charge other devices. The value of /sys/devices/platform/sony-laptop/usb_charge is 1, but the USB port is not powered on. Also when I tried toggling it to 0 it resets back to 1 when I check again using cat. So I restarted the module sony-laptop with debug flags on. When I try:
  echo -n 0 | sudo tee -a /sys/devices/platform/sony-laptop/usb_charge

  these are the curresponding kernel logs, implying that it was a success:
  [ 9121.879908] sony_laptop: found handle 0x0155 (offset: 0x07)
  [ 9121.881386] sony_laptop: __call_snc_method: [SN07:0x0000000000000107]
  [ 9121.881394] sony_laptop: called SN07 with 0x0107 (result: 0x0000)

  But if I cat the value of usb charge, the change is not reflected, and I see this when I dmesg:
  [ 9346.202318] sony_laptop: found handle 0x0155 (offset: 0x07)
  [ 9346.202489] sony_laptop: __call_snc_method: [SN07:0x0000000000000007]
  [ 9346.202494] sony_laptop: called SN07 with 0x0007 (result: 0x0001)

  If it matters, when i simply echo 1, I will get this:
  [ 9879.675844] sony_laptop: found handle 0x0155 (offset: 0x07)
  [ 9879.676878] sony_laptop: __call_snc_method: [SN07:0x0000000000010107]
  [ 9879.676885] sony_laptop: called SN07 with 0x10107 (result: 0x0000)

  The entire debug message when I restart the module(sony-laptop) is given here: http://paste.ubuntu.com/11551226/ . I have asked the same as a question on askubuntu.com. It has got a other information if you need it:
  http://askubuntu.com/questions/628542/how-to-leave-a-usb-port-powered-during-shutdown-for-charging-mobile

  ---
  ApportVersion: 2.14.1-0ubuntu3.11
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  dalton     1816 F.... pulseaudio
  CurrentDesktop: GNOME
  DistroRelease: Ubuntu 14.04
  HibernationDevice: RESUME=UUID=babf655a-816a-4c8a-ad03-6fe550cc1d60
  InstallationDate: Installed on 2015-05-28 (7 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
  MachineType: Sony Corporation SVF14212SNW
  NonfreeKernelModules: wl
  Package: linux (not installed)
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.16.0-38-generic root=UUID=d52d966a-2fa0-4050-821e-99176a8fc013 ro quiet splash vt.handoff=7
  ProcVersionSignature: Ubuntu 3.16.0-38.52~14.04.1-generic 3.16.7-ckt10
  RelatedPackageVersions:
   linux-restricted-modules-3.16.0-38-generic N/A
   linux-backports-modules-3.16.0-38-generic  N/A
   linux-firmware                             1.127.12
  Tags:  trusty
  Uname: Linux 3.16.0-38-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dialout dip lpadmin plugdev sambashare sudo
  _MarkForUpload: True
  dmi.bios.date: 11/18/2013
  dmi.bios.vendor: Insyde Corp.
  dmi.bios.version: R0220DA
  dmi.board.asset.tag: N/A
  dmi.board.name: VAIO
  dmi.board.vendor: Sony Corporation
  dmi.board.version: N/A
  dmi.chassis.asset.tag: N/A
  dmi.chassis.type: 10
  dmi.chassis.vendor: Sony Corporation
  dmi.chassis.version: N/A
  dmi.modalias: dmi:bvnInsydeCorp.:bvrR0220DA:bd11/18/2013:svnSonyCorporation:pnSVF14212SNW:pvrC10JZ3LZ:rvnSonyCorporation:rnVAIO:rvrN/A:cvnSonyCorporation:ct10:cvrN/A:
  dmi.product.name: SVF14212SNW
  dmi.product.version: C10JZ3LZ
  dmi.sys.vendor: Sony Corporation

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