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.
This bug is missing log files that will aid in diagnosing the problem. From a terminal window please run:
apport-collect 1442447
and then change the status of the bug to 'Confirmed'.
If, due to the nature of the issue you have encountered, you are unable to run this command, please add a comment stating that fact and change the bug status to 'Confirmed'.
This change has been made by an automated script, maintained by the Ubuntu Kernel Team.