T400 integrated video artifacts

[kosmos]

I have a ThinkPad T400 2765-N8G with switchable graphics running Windows 7 Professional x64. Discrete grahpics adapter works fine, but when I switch to the integrated graphics, I often get artifacts that are easier to show than to describe (see the picture below, this is what I really see). Of course, I have all the latest drivers and system updates installed. Can you help me with this problem?

[ExJamJus]

kosmos,

I had a T400 last year and was playing around wit it and installed it with Win 7 Ulti x64 ... I didn't not get this issue when I was using it .... Was wondering if this is appearing in all browsers? Also only when you are using the browser?

Any chance if you have 2 dimm RAMs installed? Try using it with 1 Ram only and see if problem persist.

[kosmos]

ExJamJus,

No, it's not a browser issue, it occurs in any opened program, more or less randomly. But the process of windows boot/shutdown is always free from artifacts.

Yes, I have additional 4 Gb RAM module installed. Not sure if those artifacts appeared before installation of this module. I will try to remove this module and check, but don't want to lose 4 of 6 Gb of RAM..

[nibs Guru]

I think the T400 requires the RAM sticks to be of equal size, if you use more than one.

[ajkula66 Guru]

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nibs wrote:

I think the T400 requires the RAM sticks to be of equal size, if you use more than one.

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No.

I've had 4GB vs. 6GB in the same machine, no issues whatsoever.

[ExJamJus]

Am just taking a stab in the dark here since you mentioned that the artifacts only happen when using Intel Integrated and not in discrete so I thought it might be RAM caused since Intel uses RAM.

Were you having this issue earlier or happened when you install the RAM? I guess remove the additional ram first to narrow down the cause.

[lead_org Microsoft MVP Contributor · Accepted solution]

try switching off the VT-d from the bios menu if you are not using Virtualisation feature.

In windows 7 with the Intel 4500 MHD, you are required to use single ram stick or dual ram stick of same size to avoid the screen artificate problem. 

[kosmos]

Switching off the VT-d helped. I do not use virtualization and don't want to change the available RAM size, so it seems the best solution for me so far.

ExJamJus, lead_org, thank you for your replies!

[ExJamJus]

@kosmos,

Appreciate your revert. Mark lead_org post as solution =)

[X_Xeroid]

Kosmos

Have you tried setting your power options to high/max performance as a test?

I know it's basic .........but I had trouble with T400 integrated graphics artifacts on power saving settings years ago & that was the easy fix!