MAJOR gfx bug - unable to resolve

Hi everyone,

I have a lenovo T400, and I get this HORRIBLE output be it on my laptop display or on an external display. See image:
On windows XP it doesn't happen (at least not in a virtual system).
There is no difference between a 32 bit OS and 64bit OS
I have not tried on Linux.

On a fresh windows instal it rarely happens, the longer my system is on, the more frequently it happens. It can be fixed by clicking alt+tab or "show desktop". Also, cycling through windows clears the lines.

I have linked my DxDiag file, so you have the totality of my system information.

please help as this is becoming extremely unpleasant.

 

What graphics does your T400 have, what BIOS?

 

Try install one of these:
Lenovo Support - Intel GM45 Display Driver for Windows 7 (32-bit), Vista (32-bit) - ThinkPad R400, R500, T400, T400s, T500, W500, X200, X200s, X200 Tablet and X301
Lenovo Support - Intel Display Driver for Windows 7 (64-bit), Vista (64-bit) - ThinkPad R400, R500, T400, T400s, T500, W500, X200, X200s, X200 Tablet and X301

Also, did you upgrade your laptop's RAM after you bought it?

 

check gfx-info (Mobile Intel(R) 4 Series Express Chipset Family)

Bios: LENOVO 7UET88WW (3.18 ), 27/05/2010

 

I see you have 3gb memory installed. See if VT-d is enabled in the BIOS and disable it if it is. There's a known graphics corruption issue with the Intel graphics and odd quantity total ram and VT-d enabled.

Lenovo Support - Visual corruption - ThinkPad R400, R500, T400, T400s, T500, W500, X200, X200s, X200 Tablet, X301

 

Yep, that happens when you have odd number of GBs RAM, like 2GB + 1GB and you're enabling 2 options related to virtualization in BIOS.

Afaik, the solutions would be:
1. get more RAM, like 2+2GB
2. Disable Vt-d in BIOS (I beleive there should be 2 options related to virtualization, and disabling 1 of them should fix the problem).

For more info, read through this:

Lenovo Support - Visual corruption - ThinkPad R400, R500, T400, T400s, T500, W500, X200, X200s, X200 Tablet, X301

You welcome.

 

I tried the drivers, no improvement

I'll try Vt-d

 

OMG THANK YOU!!!!!

disabling vt-d worked

i havent done extensive testing but so far no issues and my display is working perfectly... im nto sure what vt-d does, and I know i NEVER would have solved this without your help.

Special thx to Unreal25 and vinuneuro

 

That happened on my T400 and I fixed it by putting two 4 GB's of Ram in each slot.

 

Pf talk about posting at the same time. Cheers. I had the same problem and panicked as I thought the laptop is dying.

 

I have 3Gb of RAM in my laptop, 2Gb stick is 1066Mhz one while the 1Gb stick is 1333mhz one, shipped this way from Lenovo.
No problems so far, but I wonder whether such difference in RAM modules can cause problems in future?

 

This only applies to the GM45 chipset.

 

Thanks !