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Question

Some T410 ThinkPads could exhibit symptoms whereby the screen appears 'dithered' even though it is in 32-bit color mode. It appears that this is a result of the hardware screen not displaying at the right color depth (number of discrete colors).

 

By this I mean that the gradient picture on this page http://www.lagom.nl/lcd-test/gradient.php has bands, whereas it should not - the discrete stepping should be inperceptible at 32-bit level. Also note how the boxes at http://www.lagom.nl/lcd-test/gradient.php change as the gamma level is changed in the Windows Display Calibration wizard.

 

A potentially related issue was reported on the T400 here (but on ATI hardware):

http://forums.lenovo.com/t5/T400-T500-and-newer-T-series/T400-Dithering-on-gray-colors-when-using-AT...

 

My configuration is Lenovo ThinkPad T410 2522-K4U with Windows 7 64-bit. This has an NVIDIA NVS 3100M.

The issue was solved with the June 23rd update "Thinkpad Video Features (NVIDIA Quadro NVS/FX) for Windows 7 64-bit", but the issues returned with a Windows Update June 24. Argh.

Answer

 

As an interim solution, re-installing the drivers from the Thinkvantage System Update cache worked, although it is now not consistent with the NVIDIA latest driver.

 

The installer is at  C:\Program Files (x86)\Lenovo\System Update\session\6md636ww

and http://support.lenovo.com/en_US/downloads/detail.page?LegacyDocID=MIGR-75176

(NOTE: version 8.17.12.5738 is the one you want)

 

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Comments
hauns

this problem has been mentioned in the forums several times:

http://forums.lenovo.com/t5/T400-T500-and-newer-T-series/T410-screen-dithering-issue/m-p/465169

http://forums.lenovo.com/t5/T400-T500-and-newer-T-series/New-Nvidia-Graphic-driver-v8-17-12-6721-1-2...
http://forums.lenovo.com/t5/T400-T500-and-newer-T-series/T410-NVS-3100M-Color-distorted-after-update...

 

using 8.17.12.5738 is not a solution at all since there is no CUDA and there are issues with Firefox/WebGL. i am very disappointed that lenovo is not able to push a proper update for their drivers within 9(!) months.

 

further my observations:

- using current nvidia drivers (eg. 275.50) does not fix the problem either

- problem does not occur on external monitor (connected via VGA or DP->DVI)

- i would not call this dithering as gradient banding is a more accurate term

 

//an admin may want to add the links to the references list.


ThorsHammer

This site is so messed up that even your link to the 8.17.12.5738 driver is now busted. 

 

http://support.lenovo.com/en_US/downloads/detail.page?LegacyDocID=MIGR-75176 now points to the latest driver and it doesn't fix the banding issue.

BlackbeardBen

Yeah, with redirected links everywhere this has been a huge pain in the butt.

 

I have the same problem on my T510 4313-CTO (non-Optimus 3100m; 1920x1080 screen), and through some Google-Fu I've found a way to install those old drivers.  If you go to the following folder:

 

C:\Program Files (x86)\Lenovo\System Update\session\6md636ww 

 

You'll find the 8.17.12.5738 driver setup which fixes the problem, and the other session folders have the setup for all the other versions.  I don't know what is fixe in the newer ones but there's no way I am ever going to use a driver that doesn't do the dithering right.  I'm not too happy about this at all as I've spent hours searching for a fix.

This site is so messed up that even your link to the 8.17.12.5738 driver is now busted. 

 

haben

Hi,

 

Same problem with my T410.

 

I found the version 8.17.12.5738 of the nvidia driver here:

http://www-307.ibm.com/pc/support/site.wss/document.do?lndocid=MIGR-75173

 

Smooth gradients are finally back.

clippit

I have the same problem with T410 2522RT6 and Windows 7 64-bit!

The 6md636ww driver can be found here:

http://download.lenovo.com/ibmdl/pub/pc/pccbbs/mobiles/6md636ww.exe

 

And the issue haven't been fixed until now!

wft

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