Public bug reported:

After playing a lot, I can't swith from integrated Intel to Discrete
Radeon VGA.

vgaswitcheroo:

0:DIS-Audio: :Off:0000:01:00.1
1:DIS: :DynOff:0000:01:00.0
2:IGD:+:Pwr:0000:00:02.0

If: "echo DIS > ...../switch" display turn off. 
I tried make an script, switching to DIS and after launching a modified 
xorg.conf. But even that, none seem to happend. Screen still off.
 
GLXHEAD show rendering with INTEL instead of discrete Radeon:
root@labPC:/tmp# glxheads 
glxheads: exercise multiple GLX connections (any key = exit)
Usage:
  glxheads xdisplayname ...
Example:
  glxheads :0 mars:0 venus:1
Name: :0
  Display:     0x1302010
  Window:      0x4400003
  Context:     0x13134f0
  GL_VERSION:  2.1 Mesa 10.3.2
  GL_VENDOR:   Intel Open Source Technology Center
  GL_RENDERER: Mesa DRI Intel(R) Ironlake Mobile 

Any openGL rendering app run slow.

My question is, How can I enable Discrete Radeon GPU ?

Thanks in advance!

ProblemType: Bug
DistroRelease: Ubuntu 14.10
Package: xorg 1:7.7+7ubuntu2
Uname: Linux 3.19.0-031900rc1-generic x86_64
.tmp.unity.support.test.0:
 
ApportVersion: 2.14.7-0ubuntu8
Architecture: amd64
CompizPlugins: No value set for 
`/apps/compiz-1/general/screen0/options/active_plugins'
CompositorRunning: compiz
CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
CompositorUnredirectFSW: true
CurrentDesktop: Unity
Date: Mon Dec 29 09:25:17 2014
DistUpgraded: Fresh install
DistroCodename: utopic
DistroVariant: ubuntu
ExtraDebuggingInterest: Yes
GraphicsCard:
 Intel Corporation Core Processor Integrated Graphics Controller [8086:0046] 
(rev 02) (prog-if 00 [VGA controller])
   Subsystem: Hewlett-Packard Company Device [103c:143a]
 Advanced Micro Devices, Inc. [AMD/ATI] Park [Mobility Radeon HD 
5430/5450/5470] [1002:68e0] (prog-if 00 [VGA controller])
   Subsystem: Hewlett-Packard Company Device [103c:143a]
InstallationDate: Installed on 2014-11-05 (53 days ago)
InstallationMedia: Ubuntu 14.10 "Utopic Unicorn" - Release amd64 (20141022.1)
LightdmGreeterLog: ** (lightdm-gtk-greeter:4854): WARNING **: Failed to load 
user image: Failed to open file '/home/lab/.face': No such file or directory
LightdmGreeterLogOld:
 ** (lightdm-gtk-greeter:9939): WARNING **: Failed to load user image: Failed 
to open file '/home/lab/.face': No such file or directory
 g_dbus_connection_real_closed: Remote peer vanished with error: Underlying 
GIOStream returned 0 bytes on an async read (g-io-error-quark, 0). Exiting.
Lsusb:
 Bus 002 Device 002: ID 8087:0020 Intel Corp. Integrated Rate Matching Hub
 Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
 Bus 001 Device 003: ID 5986:0149 Acer, Inc 
 Bus 001 Device 002: ID 8087:0020 Intel Corp. Integrated Rate Matching Hub
 Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
MachineType: Hewlett-Packard HP G62 Notebook PC
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.19.0-031900rc1-generic 
root=UUID=05c3db73-a1ee-4f45-bc69-bd0599d3613e ro quiet splash vt.handoff=7
Renderer: Software
SourcePackage: xorg
Symptom: display
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 11/09/2011
dmi.bios.vendor: Hewlett-Packard
dmi.bios.version: F.48
dmi.board.asset.tag: Base Board Asset Tag
dmi.board.name: 143A
dmi.board.vendor: Hewlett-Packard
dmi.board.version: 60.50
dmi.chassis.asset.tag: Chassis Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: Hewlett-Packard
dmi.chassis.version: Chassis Version
dmi.modalias: 
dmi:bvnHewlett-Packard:bvrF.48:bd11/09/2011:svnHewlett-Packard:pnHPG62NotebookPC:pvr0594110000252710001020100:rvnHewlett-Packard:rn143A:rvr60.50:cvnHewlett-Packard:ct10:cvrChassisVersion:
dmi.product.name: HP G62 Notebook PC
dmi.product.version: 0594110000252710001020100
dmi.sys.vendor: Hewlett-Packard
version.compiz: compiz 1:0.9.12+14.10.20140918-0ubuntu1
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.56-1
version.libgl1-mesa-dri: libgl1-mesa-dri 10.3.2-0ubuntu0.1
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 10.3.2-0ubuntu0.1
version.xserver-xorg-core: xserver-xorg-core 2:1.16.0-1ubuntu1.2
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.9.0-1ubuntu2
version.xserver-xorg-video-ati: xserver-xorg-video-ati N/A
version.xserver-xorg-video-intel: xserver-xorg-video-intel 
2:2.99.914-1~exp1ubuntu4.1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.11-1ubuntu2
xserver.bootTime: Mon Dec 29 09:06:59 2014
xserver.configfile: default
xserver.logfile: /var/log/Xorg.0.log
xserver.outputs:
 Output                                  HDMI-0          LVDS-0           VGA-0 
 product id                                                                 684 
 vendor                                                                     LGD
xserver.version: 2:1.16.0-1ubuntu1.2
xserver.video_driver: modesetting

** Affects: xorg (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug compiz-0.9 performance ubuntu utopic

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https://bugs.launchpad.net/bugs/1406222

Title:
  Can't switch to Radeon rendering

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