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I have install Ubuntu 11.10 64bit on my Hp Dv6-3150el. My Notebook has two graphics cards:

lspci | grep VGA
00:02.0 VGA compatible controller: 
 Intel Corporation Core Processor Integrated Graphics Controller (rev 02)
01:00.0 VGA compatible controller: 
 ATI Technologies Inc Madison [AMD Radeon HD 5000M Series]

I tried to install the proprietary graphics drivers ''fglrx'' available in "Additional Drivers", which does not give me 3D graphics acceleration (and I can't install those post-release).
Then I can try to download and install from the website (I tried the version that Catalyst 11.8 11.12).
The installation goes perfectly (I followed this guide and others), except that when I configure Xorg.conf file:

sudo aticonfig --initial
PowerXpress error: Cannot stat '/usr/lib64/fglrx': No such file or directory
Failed to initialize libglx for discrete GPU
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I think you want to make a symbolic link between /urs/lib64 and /usr/lib so it would be

ln -s /usr/lib /usr/lib64

But I'm not sure that will solve your issues. After running aticonfig and restarting my computer, I got a black screen.

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I've used this forum post with success:

my lspci displays:

00:02.0 VGA compatible controller: Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller (rev 09)
01:00.0 VGA compatible controller: Advanced Micro Devices [AMD] nee ATI Whistler [AMD Radeon HD 6600M Series] (rev ff)

however there is a difference between Radeon 5xxx and Radeon 6xxx devices.

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What I did was copying the /usr/lib/fglrx folder to /usr/lib64/fglrx:

sudo cp /usr/lib/fglrx /usr/lib64/fglrx

After restarting the XServer I was able to open AMD Control Panel and chose between dGPU and iGPU.

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