← Back to team overview

kernel-packages team mailing list archive

[Bug 1027522] Re: 1002:6760 Power consumption higher after resume, probably vgaswitcheroo/radeon related


Alessandro Pignotti, as per http://www.sony.co.uk/support/en/product/VPCSB2C5E/updates an update is available for your BIOS (R2087H4). If you update to this following https://help.ubuntu.com/community/BiosUpdate , does it change anything? If it doesn't, could you please both specify what happened, and just provide the output of the following terminal command:
sudo dmidecode -s bios-version && sudo dmidecode -s bios-release-date

Please note your current BIOS is already in the Bug Description, so
posting this on the old BIOS would not be helpful.

For more on BIOS updates and linux, please see

Thank you for your understanding.

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

** Summary changed:

- 1002:6760 Power consumption higher after resume, probably vgaswitcheroo/radeon related
+ 1002:6760 [Sony VAIO VPCSB2C5E] Power consumption higher after resume, probably vgaswitcheroo/radeon related

You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.

  1002:6760 [Sony VAIO VPCSB2C5E] Power consumption higher after resume,
  probably vgaswitcheroo/radeon related

Status in The Linux Kernel:
Status in “linux” package in Ubuntu:

Bug description:
  I noticed that the power consumption, as reported in


  gets higher when I resume my laptop from suspend to RAM. I strongly
  suspect that this is related to a bug in vgaswitcheroo or the radeon
  driver, since the power used after resume is consistent with the power
  used when the discrete video card is not off.

  Before resume I made sure the discrete card was off by using

  sudo bash -c "echo OFF > /sys/kernel/debug/vgaswitcheroo/switch"

  At resume, with high power consumption, the state is reported as

  sudo cat /sys/kernel/debug/vgaswitcheroo/switch
  1:DIS: :Off:0000:01:00.0

  Still, if I run:

  sudo bash -c "echo ON > /sys/kernel/debug/vgaswitcheroo/switch"
  sudo bash -c "echo OFF > /sys/kernel/debug/vgaswitcheroo/switch"

  Now the power consumption goes down to the expected level.

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: linux-image (not installed)
  ProcVersionSignature: Ubuntu 3.2.0-26.41-generic 3.2.19
  Uname: Linux 3.2.0-26-generic x86_64
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
  ApportVersion: 2.0.1-0ubuntu5
  Architecture: amd64
   **** List of CAPTURE Hardware Devices ****
   card 0: PCH [HDA Intel PCH], device 0: ALC275 Analog [ALC275 Analog]
     Subdevices: 1/1
     Subdevice #0: subdevice #0
   /dev/snd/controlC0:  alex       2005 F.... pulseaudio
   Card hw:0 'PCH'/'HDA Intel PCH at 0xc9400000 irq 51'
     Mixer name	: 'Intel CougarPoint HDMI'
     Components	: 'HDA:10ec0275,104d5000,00100005 HDA:80862805,104d5000,00100000'
     Controls      : 26
     Simple ctrls  : 10
  Date: Sun Jul 22 01:23:17 2012
  HibernationDevice: RESUME=UUID=6b1034dd-b958-4939-88b4-829282357ed6
  InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Beta amd64 (20110930)
  MachineType: Sony Corporation VPCSB2C5E
   0 inteldrmfb
   1 radeondrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-26-generic root=UUID=d4bbd7c4-dc64-42f6-a165-073e9b828c86 ro pcie_aspm=force i915.i915_enable_rc6=1
   linux-restricted-modules-3.2.0-26-generic N/A
   linux-backports-modules-3.2.0-26-generic  N/A
   linux-firmware                            1.79
  SourcePackage: linux
  StagingDrivers: rts_pstor mei
  UpgradeStatus: Upgraded to precise on 2012-04-27 (85 days ago)
  dmi.bios.date: 04/25/2011
  dmi.bios.vendor: INSYDE
  dmi.bios.version: R1031H4
  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:bvnINSYDE:bvrR1031H4:bd04/25/2011:svnSonyCorporation:pnVPCSB2C5E:pvrC609LHCC:rvnSonyCorporation:rnVAIO:rvrN/A:cvnSonyCorporation:ct10:cvrN/A:
  dmi.product.name: VPCSB2C5E
  dmi.product.version: C609LHCC
  dmi.sys.vendor: Sony Corporation

To manage notifications about this bug go to: