T400 - external monitor - 2.46gb usable Ram (Windows 7 32bit)

Hi,
i do have the T400 with switchable graphics and use an external monitor.
Despite 4GB installed, it is shown that only 2.46GB are usable. So I used the thinkvantage and switched my graphics accelerator to "High Power" (so to the ATI accelerator instead of the Intel), but it is still 2.46gb.
Then I disabled the INTEL chipset and rebooted: what happened is that I still had 2.46gb, and now I could not use my external monitor anymore.
Is the external monitor not usable without the INTEL chipset enabled?
Is there a way to get 3Gb or 4gb RAM working under this constellation? (Windows 7 32-bit)
thanks

If you switch to the Discrete chip in BIOS, then you can use the ReadyFor4GB patch. However, this does break XP Mode.
You could try one of the paid RAMDISK solutions that can use the extra unmanaged RAM as a pagefile.
I personally use eBoostr which caches files to the extra area of RAM to make my system a lot snappier.
W520: i7-2720QM, Q2000M at 1080/688/1376, 21GB RAM, 500GB + 750GB HDD, FHD screen
X61T: L7500, 3GB RAM, 500GB HDD, XGA screen, Ultrabase
Y3P: 5Y70, 8GB RAM, 256GB SSD, QHD+ screen

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Betreff: T440s - Only 1024x768 on external monitor (DVI, Ultra Dock, Win8.1/Win7)

EDIT NOTE: This message was moved to the top of the thread in order to assist us with an escalation. For all future post and commments please continue posting in this thread.
One more victim here. T440s (fully patched, UltraDock, lid closed, external TrackPoint keyboard), Win8.1 (fully patched), HDMI, Acer T232HL touchscreen monitor.
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Solved!
Go to Solution.

Hello,
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- (1) is not an option in Win 7, only on Win8.1, since Win 7 doesn't find any driver for this card
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- Edit: If I connect the screen via VGA, no

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T410 external monitor kills mouse/keyboard with dock

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T400 Windows 7 External Monitor issues

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T400 Win7/64 Advanced Dock -- External Monitor No Longer Comes When Booting

My configuration:
T400 (2767-14U)
Windows 7 64bit
256MB ATI Radeon 3470HD (switchable graphics running in "High Performance")
Advanced Dock (2503)
Lenovo D221 Monitor (using VGA cable)
I used the above configuration without issues for a year.
My problem:
I just replaced my hard drive, clean installed the OS and all applications, and updated all drivers and the BIOS using System Update. Since doing that, my external monitor no longer comes on when I boot my computer in the dock (lid closed). The only way I can get the external monitor to work is to boot my computer first, and then "hot dock" it.
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Thanks in advance for any help!
Solved!
Go to Solution.

Maybe the BIOS setting for Default Display got switched back to ThinkPad LCD?
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T400 Images Not Displaying Correctly On External Monitor

One of our users has a T400 laptop (6475-FM4) with Windows XP Professional installed on it. He has an external monitor that he has plugged in to his laptop which he is using to extend his desktop.
If you open up a document (say Word or Excel) that contains images and view it on the laptops screen you can scroll up and down the document and the images are displayed OK.
If you open the document on the external screen then the images are displayed when you first open it, but as soon as you scroll up or down all you can see are the place holders for the images. If you move the document back to the built-in screen they display correctly.
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I have tried turning down the Hardware Acceleration but that did not resolve the problem.
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I've made sure that the Picture placeholders option is not ticked in Word (again found on Google)
I've searched the internet for other possible solutions and can not find any.
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one more point to add...i installed windows using bootcamp, and through windows the 2560X1440 resolution works. so its not a hardware problem either

T400- make the external monitor primary problem.

I use T400 and Acer p223w monitor.
From some reason I cannot make the external monitor to be the primary monitor.
Using the Presentation Doctor I have the option to define the external monitor as the primary but when I test it, it says that I have illegal parameters of color depth and resolution.
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On the other hand using the same parameters if I configure the laptop monitor to be the primary everything works just fine.
Any idea what causing it and how to solve it will be highly appreciated.

Since I have a German Windows client I can only guess the wording on the english client, but try the following, which worked on my T500:
Bring up the mobility center by pressing Win+X
Click the button to connect an external monitor
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In my case windows remembers this configuration and you do not have to do these steps again after reboot or when you reconnect the external monitor.
Hope this helps for the T400, too.
Message Edited by pfahsel on 03-18-2009 02:18 AM

T400 - external monitor - 2.46gb usable Ram (Windows 7 32bit)

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