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[Pablo <pablo.petzen@xxxxxxxxx>]

Hi Christopher, for me is hard to test unofficial kernels right now because i just got one linux partition on my hd.
For now on ubuntu 15.04 its not working.

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https://bugs.launchpad.net/bugs/1442447

Title:
  Swichable Graphics not working - Intel Hd 4400-Radeon 8850M- DELL -
  Latitude 3540

Status in linux package in Ubuntu:
  Expired

Bug description:
  The point is, the radeon venus pro hd 8850m cannot be turned on on linux, you can try official or open source drivers.
  I think the problem is by the dynamic switchable mode thats make a vga switch on windows without get a black screen, the discrete gpu are connected by hardware to the internal intel graphics card that cannot be turned off or you will have no image xD. Also on windows the intel drivers+amd must be instaled to turn amd graphics on, but on linux thats impossible.

  Already tryed all drivers from amd, on ubuntu 14.04 and 14.10, it will
  install ok and when ubuntu restart it will be on low graphics mode and
  only back to work if i purge then.

  
  "You are sure the both vgas are working on linux? If you can i will give my Latitude 3540 to you! hahaha
  By the f*****  Dynamic Mode switchable graphics and the impossibility to turn the intel adapter off by bios settings, Its impossible to turn on the Venus Pro Radeon - HD 8850m on ubuntu!
  Already tried with versions 14.04 amd 14.10 too."

  
  --- 
  ApportVersion: 2.14.7-0ubuntu8.2
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  pp         2497 F.... pulseaudio
  CurrentDesktop: Unity
  DistroRelease: Ubuntu 14.10
  HibernationDevice: RESUME=UUID=ed697923-f15a-491d-893c-5aad47c2a4ba
  InstallationDate: Installed on 2014-10-24 (169 days ago)
  InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
  MachineType: Dell Inc. Latitude 3540
  Package: linux (not installed)
  ProcFB:
   0 inteldrmfb
   1 radeondrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.16.0-34-generic.efi.signed root=UUID=56fd3629-556f-48b5-ba86-352fcbe527d5 ro quiet splash vt.handoff=7
  ProcVersionSignature: Ubuntu 3.16.0-34.45-generic 3.16.7-ckt8
  RelatedPackageVersions:
   linux-restricted-modules-3.16.0-34-generic N/A
   linux-backports-modules-3.16.0-34-generic  N/A
   linux-firmware                             1.138.1
  Tags:  utopic
  Uname: Linux 3.16.0-34-generic x86_64
  UpgradeStatus: Upgraded to utopic on 2015-02-25 (45 days ago)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
  _MarkForUpload: True
  dmi.bios.date: 01/28/2015
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A10
  dmi.board.name: 09HY4K
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 8
  dmi.chassis.vendor: Dell Inc.
  dmi.chassis.version: A10
  dmi.modalias: dmi:bvnDellInc.:bvrA10:bd01/28/2015:svnDellInc.:pnLatitude3540:pvrA10:rvnDellInc.:rn09HY4K:rvrA00:cvnDellInc.:ct8:cvrA10:
  dmi.product.name: Latitude 3540
  dmi.product.version: A10
  dmi.sys.vendor: Dell Inc.

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