AMD HD7450 driver crash in Lenovo M82 / Windows 7 x64

Dear Lenovo Community,
I tried today to install an AMD HD7450 (not the one sold by Lenovo but does it make a difference ?) on the PCIe port of a Lenovo M82. The aim for me is to use 3 screens on the Lenovo.
I have two distinct problems I do not understand.
-> First of all : Lenovo Bios concerning "multiple screen" option.
What does exactly means this option ? This does nos seems to be explained in the Lenovo "hardware" PDF.
I found here : http://download.lenovo.com/express/HT062228.html
That "multiple screen support" with additionnal PCI-e card requires to use the "IGD" mode and Enable Multi-Monitor Support. However, when I do so, the two screens (two LCDs with 1080p support, one VGA, one DVI) do not go on : only one of these is on even when Windows Desktop is reached, whatever the IGD, Auto, PEG and so one options I do activate. I think it's not normal, even if the driver is not installed. The two video cards (internal and PCI-e) should run in a VGA compatibility mode, isn't it ? So I have a question : does the Lenovo BIOS automatically disable the internal video card when an extra PCI-e card is detected ? Or does this behavior depends on "Select ACtive Video" / "Multi-Monitor Support" options of the BIOS ? Could someone clarify what is the M82 behaviour about this, or give some documentation ?
-> Next : AMD HD 7540 compatibility, even as unique video display
To install the AMD HD7540 video card on the Windows 7 x 64 system (installed by default with the Lenovo computer), I used the driver provided by Lenovo here :
http://support.lenovo.com/fr_FR/downloads/detail.page?DocID=DS029174
Once the driver is installed, the PC crashes. Then, impossible to restart it (I did not try the recovery mode) : once the "Lenovo" logo is shown, the screen displays a blinking something at the top of a blank screen, and the startup does not seems continue. To recover the boot sequence of Windows, I had to remove the card from the PCI-e port.
What should I do to install this video card ?
And over all : How can I have 3 display screens with the integrated lenovo video card + the AMD HD 7540 card ?
Best Regards,
Mike

I using the "multi-monitor support" as described in the doc above to use both the internal graphics and a HD 6670 on a M91p with Win 7 64-bit.
I'm using the latest Intel driver for the internal graphics, and Catalyst 13.4 from the AMD website for the graphics card. I suggest download the software, de-install all the current graphics drivers and software (it will default to a basic Win 7 driver), reboot and install the new drivers and software.
To enable DisplayPort to DVI on the internal graphics and the DP on the 6670, I am using AMD approved DP to DVI adapters. The list is here: http://support.amd.com/us/eyefinity/Pages/eyefinity-dongles.aspx I'm using a passive single link adapter on the internal, and an active single link on the 6670 (since it's the 3rd active port, and it supplies the clock to the adapter, the adapter can clock 2 ports on it's own.) The active adapters are not much more, best to get them if you're not sure, also more flexibility down the road.
Additionally, ensure you have Win 7 SP1 installed, and latest updates ; that you have manually updated to the latest BIOS.

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Message Edited by neoprimal on 10-30-2009 09:27 PM

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